marine yacht air conditioner

5 Best Marine AC Units (For A Cool Boating Experience)

Josh Mitchell

Expert Reviewed By

Last Updated On

April 15, 2024

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A hot day on the water doesn't have to mean sweating to death. The best marine air conditioners can keep the inside of a boat ice cold even on those 100-degree days.

I know that a marine air conditioner can be an expensive investment that should not be taken lightly.

That's why I made this list of the best marine AC units to help boaters find the best way to stay cool in those hot summer months.

Quick Glance - My Recommendations

Dometic Brisk II ‎B57915.XX1C0

Editor's choice.

Webasto AC Retrofit Kit

Best Replacement Marine AC

Dometic Emerald Titanium DEUX

Best High-End

5 best marine air conditioners for a cool day of boating, 1. dometic brisk ii ‎b57915.xx1c0.

Best Rooftop AC

Overall Score

Energy Efficiency

Cooling Ability

Value for Money

Who is the Dometic Brisk II best for?

This Dometic marine air conditioner is best for people who don’t have room for a conventional marine air conditioner.

• No condensate line or water pump required
• Completely self-contained
• Easy to install if you already have a hole
• The unit is very noisy
• Installation may require extra bracing on the roof

The Dometic Brisk II resembles an AC unit on a camper or RV, but this one goes on the roof of your boat.

It is a perfect replacement for an existing roof-mounted air conditioner unit, and I really like how easy it is to add to a boat without air conditioning.

Not all boats can support a roof-mounted marine air conditioner. However, this air conditioner does not take up space inside , and it is easily accessible to work on.

The condensing and evaporator unit is housed entirely on the roof and is shielded from the elements with a cover.

One thing that some people do not like is that the air conditioner is visible from the outside.

However, I don’t mind it on some boats because the white cover keeps the unit from sticking out like a sore thumb.

The noise level is also a common complaint, but it’s about as loud as a window air conditioner.

All that you will see inside the boat is the ceiling-mounted vent and the air conditioner controls.

The indoor trim is called a distribution box and provides a way to direct airflow (I often compare it to the air vents in a car).

The air conditioner’s manual contro ls are also mounted on the distribution box.

The Dometic Brisk II requires a 14" X 14" hole in the roof with structural supports.

The boat's roof must be able to support about 75 lbs, and there must be space to run electrical wires.

If you are comfortable making a couple of cuts in the boat, then this can be a DIY job.

I'm pretty daring, but this is one of those projects that could turn into a major undertaking.

Also, remember that lugging this thing onto the roof alone may be difficult, so be sure to guilt a friend into helping.

Alternatively, the Brisk II can connect to ductwork. This would require your boat to have air ducts running up to the roof, as well as a thermostat mounted on a wall.

Although I like the cleaner look of a ducted system, few boats have ductwork running to the ceiling.

If you don’t have ducts already running to the ceiling, then I would stick to a self-contained marine air conditioner, like the Webasto AC Retrofit Kit below.

2. Webasto AC Retrofit Kit

Who is the Webasto Retrofit Kit best for?

The Webasto Retrofit Kit is the best marine air conditioner for people who need to replace their existing marine air conditioning system.

• Easy to install yourself
• Compact enough to fit anywhere
• Includes digital thermostat
• Unit is painted to prevent rust and corrosion
• Noisier than comparable self-contained units
• Thermostat requires a special cable

I found the Webasto AC Retrofit Kit to be the perfect replacement for an aging marine air conditioner that is limping along on its last leg.

I really like this self-contained unit, but unlike the Dometic Brisk II , it  does not require cutting a hole in the ceiling.

The compact size makes it easy to install, no matter the current unit's size.

The Webasto AC Retrofit Kit is a standard, self-contained marine system, so it relies on seawater for cooling.

It also requires a condensate drain hose , which can connect to the boat's bilge. I prefer to connect to the waste tank so the bilge isn't constantly filling up with condensate.

Besides AC, the Webast Retrofit AC Kit also has heat, which is great for boating in the winter months or for people traveling up north.

Setting the AC and heat is easy with the included digital thermostat that can be mounted on a wall with the included cable.

If you don't want to get up to change the temperature, Webasto has you covered with an optional remote control.

If your boat doesn't have AC, then the Webasto AC Retrofit Kit is a good option.

I recommend looking for an easy place to install it, like under a bench or bed. Try to find a place close to existing plumbing and an electrical box.

All that's required for installation is a 5" piece of ductwork, ¾" piping for the seawater inlet/outlet, 12-gauge stranded wire, and some determination.

It also needs a submersible pump to suck water from the sea.

3. Dometic Emerald Titanium DEUX

Premium Model

Who is the Dometic Emerald Titanium DEUX best for?

The Dometic Emerald Titanium DEUX is the best marine air conditioner for large boats with over 300 square feet.

• Several different BTU options available
• Customize your AC with different air handlers
• Condenser noise stays contained to the engine room
•  Also serves as a heat pump
• Very complicated to install
• Requires separate air handlers

When I look at a new air conditioner, I expect it to last for a long time. The Dometic Emerald Titanium DEUX has the best marine air conditioner design on the market!

The white painted body helps to protect it from rust and corrosion. There are also brackets that serve as a frame to protect the compressor if it gets jostled around.

The Dometic Emerald Titanium DEUX  is not  a   standalone unit. Unlike the Webasto AC Retrofit Kit , this air conditioner only consists of a compressor.

The upside is that you can mount this unit in an exterior compressor compartment and run pipes to the evaporator.

I like modular systems, especially for larger boats, since they allow for more customizability.

The Dometic Emerald Titanium DEUX is the perfect choice for large boats because it comes in a range of cooling capacities.

I mentioned that this is a well-built system, and that is evident when trying to pick up this 150 lb brick.

Be sure to keep the weight in mind because you will need help to get it aboard.

Although I really like the quality of the Dometic Emerald Titanium DEUX , I can't overlook the installation challenges.

Copper lines must be run to a condensing unit, and electrical wiring must be connected to both the condenser and the evaporator.

It also needs a thermostat to control the air conditioner.

4. Ivation IVACA6500

Dehumidifier AC Combo

Who is the Ivation IVACA6500 best for?

The Ivation IVACA6500 is best for people who want to quickly and easily add a marine air conditioning system to their boat.

• Easily add air conditioning in less than an hour
• One of the cheapest marine air conditioning systems
• Has a digital thermostat built-in
• Dehumidifying mode removes moisture
• Requires an opening window
• No option for heating

The first time I saw the IVACA6500, I mistook it for a home window air conditioner.

It works just like a window air conditioner, with the condenser sitting outside and the evaporator inside.

The only difference is that the IVACA6500 actually has two separate parts connected by a rubber tube.

This makes it ideal for marine applications, thanks to the flexible mounting system .

The most important thing that may be a problem is the need for a window that opens to pass the connections through.

I found installation to be super simple, though, thanks to the included adjustable brackets.

These brackets allow for placement adjustment by clamping the unit to the window.

However, I recommend placing the unit below the window and modifying the brackets to mount it in a more discrete location.

After you get the unit mounted, just plug it into a 120V outlet and fire it up . The digital thermostat on the front can set the air conditioning to a desired temperature.

However, I find that these thermostats are not nearly as accurate as wall-mounted ones used in traditional AC systems, like Dometic and Webasto .

As a light sleeper, I highly recommend this unit for a bedroom thanks to its quiet operation at 55 dB.

I suggest setting the timer to turn the air on an hour or two before bed so it is nice and cool, then take advantage of the sleep mode to quiet the fan noise.

During the day, I find it much better to use the dehumidifier mode.

I like the IVACA6500's dehumidifier mode since it is perfect for keeping the boat nice and dry on those temperate days.

Some people do complain about the look of the outdoor condensing unit, but at least it doesn’t obstruct the window.

I personally don’t think it looks bad, and it is easy to remove the unit in the cooler months.

At only 6,500 BTUs, the Ivation IVACA6500 will cool a room or a small boat . One good thing about the smaller units is that it doesn't need a ton of electricity to keep it going.

With that in mind, you are still stuck running on shore power with this air conditioner.

5. MarinAire Self-Contained Marine AC

Best Small Compact AC

Who is the MarinAire Self-Contained Marine AC best for?

The energy-efficient MarinAire Self-Contained Marine AC is best for boats with little room for a marine AC unit.

• Self-contained unit with plastic housing
• Energy efficient cooling power
• Pressure gauges to check refrigerant
• Insulated blower keeps noise down
• Humidistat controls humidity levels
• Requires a separate water pump sold separately
• Special wiring must be run to the thermostat

The MarinAire is my favorite self-contained air conditioning unit, but it is unique.

The compressor and coils are protected by a molded plastic case, which definitely adds some protection.

The case also helps to keep the noise level down when the air conditioner is running.

The MarinAire is also the most compact marine ACs I've come across, and it is even smaller than the Webasto AC Retrofit Kit .

It will fit in tight compartments or under benches where other self-contained systems can't.

I also like the hook on top, which is a lifesaver when lowering the air conditioner into the cabin. It really turns the installation into a one-man job.

The standout features are the built-in pressure gauges to quickly check the high and low pressures without special tools.

I’ve looked at a lot of marine air conditioners with varying features, but the Marinaire has some of the best features included, such as a wireless remote.

It also comes with a conventional thermostat for the wall.

The Marinaire is the only marine AC unit I have seen with wireless connectivity.

You can control the marine AC unit from anywhere with the included WiFi thermostat (assuming you have internet access).

Installation is also a breeze since this is a self-contained unit.

The main components not included are some pipes for the stainless steel drain pan and water cooling, as well as a pump.

From there, all it takes is running the pipes and wire for the thermostat and humidity sensor wiring to the cabin.

Finally, connect the duct (size varies by BTU) and plug in the marine AC unit to start cooling off.

Comparing Marine Air Conditioners

Factors to consider when choosing a boat ac, what size cooling does your boat need.

The exact size cooling capacity your boat needs requires a complex calculation.

My general rule of thumb is that one BTU (British thermal units) cools about 5 square feet and heats 10 square feet.

This is based on moderate climate control and cooling an area below deck.

• Large Boats The Dometic Emerald Titanium Deux  is perfect for large boats over 500 square feet . I recommend this for a very large yacht with a separate engine compartment and large living spaces. Sometimes, larger boats use two units.
• Medium Sized Boats Smaller boats from 200-500 square feet have a few options, including the Webasto AC Retrofit Kit  and the Marinaire AC system. These self-contained systems are perfect for small to mid-size boats with room to run a short piece of ductwork.
• Small Boats Finally, marine AC units like the Dometic Brisk II  and Ivation IVACA 6500  are perfect for small boats in the 100-200  square foot range.

I always consider the size of an existing marine AC unit and also perform a new calculator.  

There are several formulas that get very scientific, but a simple online capacity calculator is my go-to.[ 1 ]

TL;DR: You much choose an AC system based on the covered area of your boat. The larger the boat, the more powerful systems with high BTU capacity is required.

What Is Your Budget?

The most budget-friendly marine air conditioners cost less than $1,00 0, while ducted systems can easily cost a few thousand.

I know most people have a budget in mind with these larger projects. In that case, the budget will dictate what type of system you can get.

A traditional self-contained marine AC system like the Marinaire or Webasto I mentioned above typically costs about $2,500.

Split systems like the Dometic Emerald Titanium Deux cost significantly more.

The exact price varies by dealer as Dometic does not advertise the cost for its high-end split systems.

AC Lab Note:

Don't forget to consider installation, which will likely cost about the same as the unit, depending on the required work. Similarly, split systems cost significantly more to install than self-contained marine air conditioners.

Continuing on with self contained systems, the Dometic Brisk II is a fairly cheap option as it starts around $1200.

However, the cost to install may be higher than other self-contained systems like the Marinaire  and Webasto  .

Retrofitting a smaller unit like the Ivation will be the most affordable route. I commonly see these systems for around $700.

Most marine AC units I've found run on a generator, which will add a significant cost if you don't already own one.

TL;DR: You budget would dictate the type of AC you choose. Some AC systems like the split or self-contained marine AC systems are more expensive than roof-mounted ACs.

How Long Is The Warranty?

Marine air conditioner warranties vary significantly between brands, but most come with at least a one-year parts warranty.

Higher-end models like Dometic's Emerald Titanium come with a parts and labor warranty.

In comparison, companies like Webasto  and Ivation  have a parts-only warranty.

One and two year parts warranties are pretty standard in the marine air conditioner industry.

I find that Dometic offers the best marine air conditioner warranty at two years on many of its higher-end products. It is also one of the most inclusive warranties.

TL;DR: One and two years parts warranty is fairly standard but try to look for a unit that offers a longer warranty period.

How Easy Is It To Install?

Some marine air conditioning systems are easy to install, while others vary in complexity .

More importantly, everyone has a different level of abilities.

People planning a DIY install should first determine if there is room in the boat to mount a self-contained unit. Then, plan where to run the pipes and electrical.

Alternatively, consider a roof-mounted unit if there isn't space for a conventional marine AC unit.

The roof-mounted unit requires a single hole but also requires framing out the roof around it.

Most people don't want to spend days hacking away at their beloved boat , so I would go with the Ivation IVACA6500 , or even a portable boat air conditioner.

The most difficult-to-install marine AC units are split systems, where the condensing unit goes in the engine room.

These are more expensive units and difficult to install since pipes must be run throughout the boat.

These may also require extra refrigerant to be added, and the lines must be vacuumed.

I would only recommend this system for really large boats or if it is already undergoing extensive maintenance.

TL;DR: Most ACs systems are easy to install, some like the roof-mounted ACs would require cutting holes. Marine ACs are also very heavy so they will definitely require help in installation.

How Easy Is It To Maintain?

Maintaining marine AC units is similar to keeping up with a home AC system .[ 2 ]

The most important thing to do is keep the return air filters clean. I also recommend checking the coils annually to ensure they are not dirty.

A chilled water system such as the Webasto , Marinaire , and Dometic Emerald Titanium  I looked at do require a little extra attention, such as ensuring the water does not freeze in cold months.

I am a fan of low maintenance , and you can’t get much simpler than the Ivation IVACA 6500 and the Dometic Brisk II .

Both marine AC units are easy to access , so filter cleaning requires little effort.

The good thing about most marine AC units is that they are serviceable.

Most marine AC systems mentioned above have service ports so an AC tech can easily perform a check-up and get the system running like new again.

TL;DR: Look for marine ACs that offer ease-of-maintenance features such as service ports, easy to access filters etc. 

How We Review & Rank Our Product List

At Air Conditioner Lab, our team follows a similar process when evaluating all products reviews before formulating our final lists for readers.

We begin by gathering data sources directly from brands, e-commerce platforms, online retailers and press releases.

These are then added to a master file we use to compare features specifications from all air conditioner models. You can access this Air Conditioner Sheet Here .

Next, we narrow down all the products on the market by evaluating user reviews, ratings and feedback from a wide variety of online and in-person sources.

Our team then discusses and co-ordinates our first hand experiences using these products, as well as gather independent opinions and feedback through Youtube and customer reviews.

4 Types Of Marine ACs Found On Boats

1. Self-Contained Units

Self contained marine air conditioners like the Webasto and Marinaire place the condenser and blower in a single package.

Most marine air conditioners rely on seawater to cool the returning refrigerant. These units are very efficient, quiet, and compact, which is perfect for a boat.

Adding this type of marine air conditioner is also very easy, even if your boat never had air conditioning.

All that they require is a hose for the seawater, electrical, and a hole for the vent.

Using a vent means self-contained units are great for directing airflow to a specific part of the boat.

It is also worth noting that self-contained units can also refer to portable, roof-mounted, or hatch-mounted systems where the condenser and evaporator are together in one assembly.

2. Hatch-mounted Units

A boat hatch-mounted marine air conditioner is designed to fit into a boat’s existing hole in the roof.

These units are very easy to install, but they come with a few challenges.

Hatch mounted air conditioners are essentially a window AC unit with an angled duct that attaches to the boat's hatch.

I often see people confuse roof-mounted air conditioners like the Dometic Brisk II with hatch-mounted marine AC units. It may be possible to install a roof-mounted AC unit into a hatch, but most hatches are too large.

3. Chilled Water Units

Chilled water units are some of the most popular marine AC systems, and chilled water may be used on both split and self-contained systems.

A pump takes seawater and pushes through copper piping on the chiller, known as a heat exchanger.

Instead of using large condensing coils like your home's AC system, the seawater cools the coils, so there is no need for a fan.

Besides heat transfer, chilled water units still operate like most other air conditioners.

For instance, they have a compressor, evaporator coil, and a reversing valve (on heat pump models).

To boil this down, chilled water units are perfect for boats because there is a constant supply of water to keep the system cool.

This also removes the need to place a condensing unit outside since the seawater literally removes heat from the boat.

4. Split-air Units

A split-air unit is simply an air conditioning system where the condenser and evaporator are separate.

In most applications, the condenser coils and compressor are outside, while the evaporator coils and air handler are inside.

This is the exact opposite of a self-contained marine air conditioner. However, it can use either a chilled water system or an air-cooled condenser.

I don’t want to make this too complicated, but the Ivation we covered is technically a split system since the condenser and evaporator are separate.

However, a more conventional example is the Dometic Emerald Titanium DEUX .

Split systems are ideal for larger vessels with an engine room or boats with multiple evaporator units.

I recommend against these complex split systems for many boaters because they are very complicated, and repair can be costly.

TL;DR: There are many different types of marine AC systems. Some systems are suitable for smaller covered area such as roof-mounted ACs, others systems like split air or self contained units are essential for larger covered area.

How Many Watts Does A Marine Air Conditioner Use?

The exact number of watts a marine air conditioner uses varies by model and BTUs. For example, a 6,000 BTU self-contained unit uses about 500-550 watts.

How Long Do Marine Air Conditioners Last?

A marine air conditioner’s lifespan hinges largely on how well it is taken care of. The average life is about ten years, but this may vary depending on how much use it gets.

How Do You Size A Marine Air Conditioner?

You size a marine air conditioning unit based on the cubic footage of the boat, as well as sun exposure and climate. A quicker and easier way to get in the ballpark is by multiplying 5 BTU times the square feet of the boat.

How Do You Maintain A Marine Air Conditioner?

The most important part of maintaining a marine air conditioning unit is to clean out the return air filter and keep the condensate pan clear. Be sure that water does not freeze in the pump or pipes during the winter.

What Is The Difference Between Refrigeration And Air Conditioning On A Ship?

Refrigeration and air conditioning are often used interchangeably when discussing cooling systems on a ship.

However, the word refrigeration is mainly used when talking about cooling systems like freezers and other cold storage. In contrast, air conditioning commonly refers to regulating temperatures in a living space.

So, Which Will You Buy?

The best marine air conditioner will depend on your boat’s size and needs. I like all of the marine AC units that we covered, but each one really fits a specific need.

However, I find the MarinAire Self-Contained system to be the best marine air conditioner because of its casing and integrated gauges.

But best of all, it is easy to install.

I also like the units built by major brands like Dometic marine air conditioners because they are well-built for a harsh marine environment and offer an excellent warranty.

My #1 Recommendation

References: 

• https://www.marinaire.com/category-s/28.htm
• https://www.energy.gov/energysaver/maintaining-your-air-conditioner

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Midea U Shaped Window Air Conditioner

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The Best Marine Air Conditioners for Boats & Other Marine Vessels

Written by J. Harvey / Fact checked by S. Numbers

Having the best marine air conditioner is beneficial for the entire boat and the people on it. The even temperature movement from any boat AC unit and other self-contained units of a marine AC influence boating results.

Getting the right boat AC system starts with knowing the answer to, “How do you size a marine air conditioner?” Here are other essential features, factors, and FAQs about marine air conditioning systems for your reference:

• Boat Sizing and Layout – These are important when choosing the top-rated marine air conditioners or specific portable boat air conditioner. Decide wisely which marine air conditioner or portable marine air conditioner to buy. Measure the square area you like to get cooled to know the load factor. Include insulations, sunlight exposure, windows, height, and other factors for a large or small boat air conditioner.
• These refrigeration factors help determine the desirable British Thermal Units (BTUs) or power draw for the entire boat, which influences the needed cooling power of the entire boat hatch from your energy-efficient marine air conditioners.
• Ease of Installation: This relates to the practical cost of installing your boat hatch air conditioner. The easier you install it, the better to plug, play, and relocate like a portable AC for boat does.
• Installation for a portable boat AC, a 12 volt boat air conditioner, or a marine air conditioner 16,000 BTU varies. They’ll likely need specific wiring, plumbing, ducting, and location aspects that may be handy, mild, or complex to install.
• Mount your marine air conditioner units properly for good refrigeration cycle or return air to and from the cooling units. Ensure the marine air conditioners have proper ducting, discharge options, and enough space to ease their maintenance servicing.
• Power Supply: All marine air conditioners run on an alternating current or AC power source. They range from a 12v marine air conditioner to a larger 230-volt cooling performance with 3-phase compressors.

Check the manufacturer’s specifications of a marine air conditioner brand for recommended amperage, wiring, and circuit breaker sizes.

Read these reviews to get your most efficient marine air conditioner.

• Comes with a chiller unit
• Low fuel consumption
• Durable construction

• Easy to install
• Low start-up current
• Best works with boats and yachts

• Power-saving
• Portable and lightweight
• Ideal for small rooms and spaces

Table of Contents

1. Webasto 5011396A Air Conditioner Retrofit

2. marinaire marine ac and heat pump, 3. campelify 1910e-ac compact air conditioning, 4. dometic 207500310 envirocomfort retrofit, 5. black+decker bpact10wt portable ac, factors to consider when choosing marine air conditioners, how many watts does a marine air conditioner use, how long do marine air conditioners last, how do you maintain a marine air conditioner, how do you size a marine air conditioner, top 5 marine air conditioner reviews.

Among all the Webasto marine air conditioners (ACs), this self-contained AC retrofit unit is the first bestseller. Boaters love this sailboat air conditioner model that comes as a platinum series with a chiller unit for optimum performance.

The 5011396A marine air conditioning system has a cooling output of 115 volts/60Hz producing 10,000 BTU. It features a reverse cycle heat marine AC with quiet operation and a robust design that is solidly built and economical.

This self contained marine AC unit works best as a new installation or replacement and upgrade of an entire unit. The square-sized kit has a compressor compartment, condenser, evaporator, remote thermostat, and controller for a quiet operation.

I love the AC kit’s performance among big air conditioners with superior velocity blowers. The velocity blowers are durably built, comes with instructions, and complete with product information and materials for solid cooling results.

It’s a digitally and remotely programmable thermostat providing ease of operations, monitoring, and noise reduction. I can attest that these boat air systems work as one of the top-tier marine air conditioners in the market.

• Low fuel consumption/maintenance, and solid cooling results
• Well-designed and durable construction for a hassle-free installation
• Affordable and best marine AC system for a quieter operation
• Comes with a chiller unit for an optimized performance
• Excellent velocity rotatable blowers and remote thermostat control
• The square-sized air conditioner system may be difficult to retrofit

Another bestseller on our review is a compact size marine air conditioner and heat pump manufactured by MarinAire. It is really easy to install and provides outstanding cooling and quieter operation like a portable marine air conditioning unit.

I‘ve been using this 110-120 volt and 60-hertz contained marine air conditioner for over 2 years. This Integra model is easy-to-install with built in pressure gauges for better operations using its D smart control system. The digital control features help the configuration and setup of the remote temperature sensor. It is a very good small marine air conditioner unit that works with limited cabin enclosures and tiny boat spaces.

The marine AC unit has a low start-up current or low energy consumption even at higher cooling temperatures. The high-velocity rotatable blower of this boat air system works well when adjusted for any 360-degree cooling position. It comes with a compressor sound cover for noise reduction, stainless steel drain pan, and an environment-friendly R410A refrigerant. Hence, it is great as a 16000 BTU self contained marine air conditioner and heat pump 115v60 system.

• Self-contained marine air conditioner and heat pump with low start-up current
• Easy to install and monitor with rotatable blower and built in pressure gauges
• D-smart control system for better performance monitoring
• Compactly built with stainless steel drain pan and compressor sound cover
• Limited for use on boats and yachts and not designed for vehicles and home use

Check this 12v marine air conditioner review for a compact air conditioning system with a mild cooling capacity you’ll like. It comes with a DC mini-rotary compressor that is ideal for boats, camper vans, vehicle chiller’s, and refrigeration cooling systems.

This portable AC unit has a versatile, compact cycle efficiency and lightweight design for indoor and outdoor uses. It is dubbed the top-rated boat air conditioning system with 450 watts/1,535 BTU cooling power for boats and vehicles.

The compact refrigeration unit comprises of a driver board, condenser, mini-rotary compressor, evaporator, capillary, controller, etc. Its highly-tight direct refrigeration cooling unit features a miniature DC rotary compressor for high performance and vibration cushioning.

I love how this DC air conditioner uses vapor compression technology to chill the air in my boat cabin. Add its microchannel condenser, 1.9-liter compressor, and a 134A refrigerant that removes the heat and circulates chilled air, this is the smartest among boat air handlers I’ve tried for efficient spot cooling in small spaces. It uses a corded electric power source that can be a grid or battery.

• Portable and lightweight AC cycle cooling efficiency for indoor and outdoor uses
• Easy to set up low-cost air handler than most marine air conditioners
• Ideal for spot cooling small rooms and spaces
• Uses vapor compression technology for chilled air of any enclosed spaces.
• Power-saving and works with most 12V batteries, grid, or solar
• To cool larger rooms, it needs to run at full blast for optimal cooling power

Enjoy your boating seasons with this “EnviroCimfort (ECD) Dometic marine air conditioner that packs plumbing and air movement essentials. This retrofit kit is a handy air filter system for mid-sized boats and marine vessel cabins or enclosures.

The Dometic 12,000 BTU marine air conditioner is a dependable upgrade with innovative design, power, and affordable features. I like how it makes an environmentally friendly retrofit solution with useful plumbing and air movement components. This Dometic model is effective in distributing hot air to cool up my boat including the engine room whole year-round. It also comes with an electric box for easy operations, which I enjoyed using since the day I bought it.

Ensure your boat is cool all season with these self contained units of ECD AC kit. It is accompanied by an R-410A refrigerant for ecologically fit cooling performance you’ll surely like. When you purchase it, you will be given a 6 to 12 months of labor and parts warranty. Moreover, you wi;l appreciate that it is a lot more affordable than retrofitting old BTU H self-contained marine ACs.

• Affordable high-capacity marine AC for the best value of money
• Easy-to-install BTU H self-contained marine air conditioning kit
• Power-saving stellar reverse cycle heating and air filter system for mid-sized sailboats and larger boats
• Effective air distribution for boat enclosures any season of the year
• Environmentally-friendly retrofit kit with plumbing and air movement solutions
• Needs a sound shield for quieter operation

The final product on our list is a white BLACK+DECKER portable air conditioner with remote control. This corded electric-powered AC is a solidly powerful cooling and dehumidifying unit that can work well during emergencies.

It provides an unrivaled air conditioning output g to beat the heat. This versatile cooling unit can serve as a main and backup AC unit for midsize cabins while at sea. It has an optimal cooling output at about 10,000 BTU ASHRAE exhaust system. I love its easy-plug-and-play features: a window adaptor, main power cord, and other useful components for each trip.

I bought two units of these small compact AC systems, which helped me complete a great sailboating escapade. The sudden temperature issues while using them as a cooler and dehumidifier are within control. They can be used alternately as primary and secondary units for over 30 days sailboating period. Their environment-friendly R410A refrigerants and LED control panels made them safer and fully remote-controlled.

• Easy to install and assemble portable AC and dehumidifying system
• Quick remote control access and LED control panel for ease of use
• Affordable boat air handler with strong cooling output that beats the heat
• Best to work as a primary and secondary AC unit for all sizes of enclosures
• Power saving with 24-hour timer, sleep mode, and 3-fan level control
• Its cooling strength causes bothersome noise

Understanding how the marine air conditioner works needs a basic awareness of the brands available in the market. The brands in these reviews offer the AC types and components you need to operate them in your boat.

All three main types and functionalities for an effective refrigerant system are simplified below for your guide. Remember that they all have AC components comprising of a compressor, condenser, and evaporator to ease your needed air movement.

These components cool the air circulation with the help of a refrigerant flow, push the airflow cooling process, and transfer it to an evaporator component and then to the air handlers.

The distribution process also includes fans and air handlers to get cooled or chilled air into your boat cabin. You need to know these factors to judge affordable brands, heavy-duty types, among other essentials for quality boat air circulation.

What Are the Three Main Types of Boat Air Conditioning Systems

Many variants of air conditioning kits are offered in the market but boat lovers consider only a few of them. Choose among these three high-quality marine air conditioner types based on your boat size and layout:

• Self Contained Direct Expansion Systems or DX Type AC systems are loved by most boaters for their budget efficiency features. What’s more lovable about these boat AC units is that they are easy-to-install, maintain, move, and restore. They usually work for small-sized to mid-sized boat or marine vessels within about 40 feet vessel length. But they produce a bit of.
• Remote Systems or Split Gas Types are widely used in mid-sized and large marine vessels like yachts and sailboats. Split gas AC units feature a centralized condenser connected by a copper wire to a number of air coolers. Aside from being For their quieter and more space-saving perks, however, you will need to shell out a bit more money.
• Tempered Water Systems or Chilled Water Types are your best option when needing versatile boat AC systems. These systems use a refrigerant in cooling the desired areas of your boat enclosure. But you need to customize an adequate housing for its pipes, low pressure gauges, ducting, and air handlers.

Benefits and Drawbacks of a Marine Ac Unit

Go over the advantages and disadvantages to clear any second thoughts about getting your best choice from this series of reviews

• Has hybrid refrigerant system combining cooler, dehumidifier, and heater functions
• Uses environment-friendly refrigerants for chilled water AC systems and low power consumption
• Packs safety, comfort, and versatility that you may not have enjoyed before
• Makes a cooling difference that beats the heat even at the highest temperatures
• Specially designed AC kits to cool or heat specific areas of your boat
• Portable AC units requiring effortless installation, movement, and maintenance
• Power saving AC models with useful components to extend for longer uses
• Fully remote AC system with LED monitors for less space and quieter operations
• Effective single or self contained AC unit that can cool multiple boat enclosures
• Manual or auto-controlled temperature levels for effective airflow and flexible cooling of multiple areas

Disadvantages

• Expensive models like split gas types having special components and systems
• Larger AC systems can create bothersome noise while cooling wider boat areas
• AC units with larger compressors and cooling, and air handlers consume high amounts of energy from a boat’s battery

Use these marine AC benefits and drawbacks to choose the right one for the layout and size of your boat.

General Care and Maintenance Tips

Follow the essential factors in getting the right ones and know how to maintain and care for them effectively. Taking into consideration the ease of installation, AC efficiency, boat layout and size, and quieter operation are some key aspects. Include as well these general tips for proper care and maintenance:

• Safe and Comfort of Use: Any AC system onboard a vessel is aimed towards cooler air for each boat area. Maintain the AC unit to provide desired temperature levels for the safety and comfort of the people aboard the boat. Include in the preventive checks and care servicing the condenser, compressor, evaporator, air filter, air handlers, and cooling components.
• Quality of Material and Boat Equipment: Amidst extremely hot and humid weather, the soundness of your boating emanates from regular maintenance activities. Ensure preventive servicing is done to prevent rust and corrosion from endangering the quality of the boat and equipment.
• Discharge, Ducting, and Wye Provisions: Ensure that there is sufficient space around the unit to do the maintenance servicing. Remove the unit if necessary, especially the split gas types to include visual checks of the surrounding containment.

These maintenance and care factors are within the functionalities of all the AC brands in this series of reviews. Performing these basic care and maintenance servicing will help prevent enery-consumption and smooth operation issues.

Adding a boat AC onboard may require a generator set aside from the usual battery-powered supply. Ensure around 120-volts/2500-watts AC power to enjoy a 10,000 BTU AC unit, among other electric-powered appliances .

While being docked, a 5,000 BTU AC draws around 5 amperes/1,250 watts with 120-volt power. Generator sets could be an option to supply consistent power to you boat and AC equipment. Inverter-type power sets can also allow you the use electronic equipment, computers, and power tools instead of noisy generators.

These marine AC systems can serve for about 10 to 15 or more years when properly cared for. Various factors affect the life expectancy of a boat air conditioning system. AC models that complete the manufacturer’s recommended repairs, regular checks, and preventive measures can reach about 20 years. Always refer to the manufacturer’s product specifications and care sheet for the appropriate servicing and use.

Do the general maintenance of the boat airconditioning system in a regular and timely manner. Cleaning and declogging dirty air filters ease out the refrigeration system by freeing the airflow passage for the system’s efficiency.

Do the same cleaning of the interior and outdoor AC systems to visually check, clear debris, and rinse condenser coils. Ensure to check the thermostat, clean filters, declog drain lines, and switch-off humidifiers when not in use. Use a small brush, a vacuum, and blowers to dry wet parts before the next operation. Test the drain line by pouring some water for declogging and schedule the next maintenance or tune-up.

The basic tip in sizing your boat air conditioning system is to get the area of the room you need cooling. Get adequate room cooling by multiplying 25 BTU to the total area in square feet. So, for a 200 square feet area dimension, you would need about 5,000 BTU airconditioning systems. Divide the total BTU, say 12,000 by 12,000 to get the 1-ton capability for the new cooling system.

The larger the area to get cooled, the higher capacity and pump connectivity to get on your boat. The use of a pump manifold and pump relay also helps your boat AC unit using a common heat pump.

Ensure to get the needed cooling for the boat room considering various weather conditions and factors mentioned in these reviews. Correctly measure your marine vessel’s AC tonnage to get the heat you need to remove, especially when used for 24 hours.

The essential factors, AC types, and FAQs for the best marine air conditioner units are in these reviews. These top portable air conditioner for boat units and other marine vessels are your premium choices.

Whether a large or a small AC unit for boats or enclosures, they make spaces efficiently cool, providing efficient trips despite fluctuating temperatures or heat levels. Choose from the largest to the smallest boat air conditioner from this unbiased guide. Decide on getting a marine air conditioner 16,000 BTU cooling units or other premium choices that boat owners love.

“My intention from the first day establishing Boating Basics Online is to provide as much help as possible for boaters who want to experience a first safe and convenient trip. So feel free to join us and share your beautiful journeys to the sea!”

5 Best Sailboat Air Conditioners

Last Updated by

Daniel Wade

June 15, 2022

It's quite easy to imagine yourself anchored near an island, sipping juice from a young coconut without a worry in the world while aboard your sailboat. But complete comfort can only be possible if your sailboat is fitted with one of the best air conditioners (ACs).

Sailing in the hot scorching sun or tropical heat is great. But the reality that you have to deal with such hot weather and the possibility of suffering from heatstroke can be some of the major drawbacks. Sure, you can take a dip into the water or take a shower to mitigate the sweltering heat and sweat but this can only work for a few minutes if not seconds. As such, nothing is more comfortable than having your sailboat fitted with high-quality air conditioning if you want to get rid of that heat.

If you, like most of us, do not fare well in sweltering temperatures, investing in one of the best sailboat air conditioners should be the right thing to do. A sailboat air conditioner will ensure that your sailboat has the right temperature, humidity level, and airflow so that you can have a comfortable, memorable, and enjoyable sailing experience even when the temperatures are quite high.

There are hundreds of sailboat air conditioners on the market today. This makes it quite overwhelming to choose the right sailboat air conditioner for you. But as we always do, we are here to help you choose the best sailboat air conditioners that will allow you to enjoy your sailing escapades and make the boat appropriate even if you're traversing the waters with your young ones.

Table of contents

The Importance of Having a Reliable Air Conditioner on Your Sailboat

Sailing, especially in the summer, generally means that you'll have to deal with temperatures on the north of 95 degrees Fahrenheit and humidity that's close to 90%! Sailing in such temperatures is hands down challenging. Add to the fact that it can be extremely cold at night or during winter, and you have several reasons to have a reliable sailboat air conditioner installed on your vessel.

Honestly speaking, sailboat air conditioners are quite costly, especially for those of us who are cruising on a budget. However, their importance in ensuring that you have an enjoyable sailing experience and do not suffer from heatstroke can never be downplayed. With a reliable air conditioner, your sailboat will be comfortable, cool, and air will circulate in your boat, which is essential in preventing mold.

Factors to Consider when Choosing the Best Sailboat Air Conditioner

Besides being expensive, an air conditioner plays a crucial role in making your vessel more comfortable and enhancing your sailing experience. You certainly do not want to end up with a poorly working air conditioner. This is exactly why you must have a well-thought-out plan when in the market for the best sailboat conditioner.

Here are things to consider.

Size and Layout of Your Sailboat

The right air conditioner system is one that can efficiently cool or arm the entire boat without struggling. The larger the boat, the more powerful the air conditioner system you will need. Of course, you'll need more than one unit if your boat has several cabins. You'll also need space for an engine room if you choose a split air conditioning unit.

The Size of the AC Units

Modern AC units are designed to be lightweight, easy to set up, and install. These are some of the most important features to consider when choosing an appropriate AC for your vessel. You do not want to end up with a bulky unit that may not fit in your vessel.

The Air Conditioner's Power Requirement

One of the most important things to consider when choosing the best sailboat air conditioner is the unit's power requirement. Generally, you need to have generous battery banks, a powerful inverter, and an efficient source of power such as a generator or solar panel.

Most air conditioners are noisy when they operate and this can be irritating. You should go for an AC unit that is less noisy, especially if you're a light sleeper.

Your Planned Sailing Ground

Weather conditions generally affect how an AC unit will work. Of course, the unit will work a lot harder if you are sailing in hotter climates than when sailing in colder climates. With that in mind, your preferred sailing ground and its climates will determine the appropriate BTU (British Thermal Unit) that you require.

Budget and Maintenance

Keep in mind that sailboat air conditioners can be costly, so you need to consider your budget. Again, it's important to ensure that the unit is well-maintained to operate effectively without breaking down.

Best Sailboat Air Conditioners for 2020

Without wasting much of your precious time, here are the best sailboat air conditioners for 2020.

DOMETIC EnviroComfort Retrofit Air Conditioner

It has to be noted that ACs are generally costly but their importance on a sailboat can never be underestimated, especially when sailing in hot temperatures. You certainly do not want to spoil your sailing experience and that's why you have to invest in a worthwhile AC such as the Dometic EnviroComfort Retrofit Air Conditioner.

Designed with some of the most innovative features in the AC industry, the Dometic AC can perfectly cool down your sailboat and will give your vessel ideal temperatures throughout the year. Thanks to its British Thermal Unit (BTU) climate control feature, you're damn sure that you won't have any problems with whatever temperatures or seasons you face while sailing. Its R-410A refrigerant is eco-friendly and is widely recognized as one of the most environmentally safest gases.

It doesn't matter whether you're planning to sail during the hot summers or plan for ocean crossing during winter, The Dometic Retrofit will always have you back as far as the temperature of your sailboat is concerned. This AC offers 16,000 BTU per hour of cooling and reverse-heating capacities. If the 16,000 BTU per hour is so much for your vessel, this AC gives you the option of sizing down the system to perfectly fit your sailboat so that you can have maximum comfort in varying climates.

That's not all; this AC comes with reliable digital control and a self-contained AC system. It has a pre-installed air filter, which is easy to clean. In terms of installation, this AC is probably the easiest to install, thanks to its easy-to-understand installation procedures.

On the downside, you may have to contend with the system's audible fan, as well as difficulties in programming between heating and cooling. But overall, this AC is the real deal thanks to its superior velocity blowers. Of course, you'll love the fact that it is compact and very small so can fit even in the smallest of spaces.

• ‍ Comes with a pre-installed air filter, which is easy to clean
• It's compact and is built for very small spaces
• It is eco-friendly
• Comes with a high-velocity rotatable blower
• It's ultra-light
• It's energy-efficient
• It's easy to install
• ‍ It's quite noisy
• The blower doesn't move 360 degrees
• Spread controls should be improved
• May experience unintentional temperature fluctuations

MarinAire 16000 BTU/H Self-Contained Marine Air Conditioner and Heat Pump

For first time buyers, investing in the best sailboat air conditioner can be challenging, especially if you do not have the right information about the features that you need in your sailboat's air conditioner. Luckily for you, MarinAire knows what you need in your sailboat as is evidence on this amazing 16,000 BTU air conditioner.

This is unquestionably a top-quality sailboat air conditioner that's designed with built-in pressure gauges so that you don't have to constantly monitor the AC just to see whether or not it's operating efficiently. Manufactured using an SS316 stainless steel drain pan, this AC comes with a sound cover that makes it one of the quietest sailboat air conditioners currently available on the market. This sound cover can reduce up to 60% level of noise.

In terms of size, this is one of the most compact marine ACs out there. It doesn't matter how tiny your sailboat is; you'll never lack somewhere to fit in this superb AC. From its D-Smart control system, its 360-degrees blower outlet to its low start-up current, it's easy to see that this AC has one of the most innovative features in the Ac industry.

This AC comes with a distinctive design, eco-friendly R410A refrigerant, low energy consumption, and works effortlessly to make your sailing experience quite enjoyable.

• ‍ Constructed with lightweight materials
• Comes with a built-in pressure gauge
• Built with D-Smart control system for easier control
• Low start-up current
• The sound cover makes it very quiet
• Designed with 360 degrees rotatable blower
• Very compact and can easily fit in small spaces
• ‍ The electric box can be difficult to use
• The main power cord is extremely short

WeBasto AC Retrofit Unit

When it comes to the best sailboat air conditioners, WeBasto is your go-to-guys. For years, this company has been manufacturing some of the best sailboat air conditioners and the FCF Series is just a testament to what you get from this company: quality, reliability, efficiency, and affordability.

Consuming just an average of about 8.5 amps at 115 volts, this AC is quite affordable in the long run as it's probably the most energy-efficient sailboat air conditioner currently available in the market. First-time buyers will love it as it's very easy to set up and install. This is a sure guarantee that your vessel will have that much-desired cooling and heating effect with fluctuating temperatures of 45 degrees Fahrenheit and 80 degrees Fahrenheit.

This AC's compressor is very quiet and doesn't generate that irritating noise like other units while still working efficiently in keeping the cabin at favorable temperatures. More importantly, this unit is designed in such a way that you won't have to worry about servicing it for its entire lifetime.

From the onset, this sailboat AC unit may seem extremely overpriced but it will offer great value for your money in the long run. This AC is designed to be durable and efficient thanks to its superior velocity and 360-degree, three-speed blower. Although you'll have to buy the heat pump separately, this air conditioner offers some of the best features that you may require in the best sailboat air conditioner.

• ‍ Comes with a high-quality anodized evaporator
• The air filter is easy to remove and clean
• The unit is very easy to set up and install
• Comes with multi-capillary ports
• The velocity 360-degree rotatable three-speed blower is superb
• This unit is certified, reliable, and functional
• It's very quiet
• One of the most energy-efficient units
• Offers accurate temperature controls
• ‍ It's quite pricey
• You'll have to buy the pumps separately
• The condenser and compressor are faulty and need to be replaced

MarinAire 14000 BTU/H Self-Contained Marine Air Conditioner

MarinAire is a revolutionary manufacturer in the AC industry and is credited with bringing to the fore the self-contained marine air conditioner. This model is widely popular among boat owners thanks to its practicality, innovativeness, and affordability.

This sailboat air conditioner is designed with superb built-in pressure gauges that are in place to ensure that the entire unit works perfectly without any hitch. It also comes with the MSB Integra compressor that's built with an excellent sound cover to ensure that the noise levels of the unit are significantly reduced by nearly 60%.

The unit's state of the art design not only makes it sleek and modern but makes it a lot easier to use and maintain. Its 360-degree rotating blower is durable and reliable while the entire unit is made using lightweight materials. This is essential in ensuring that it can fit in compact spaces.

It's also structured with the eco-friendly R410A refrigerant, which makes it highly energy-efficient. This unit is arguably one of the best sailboat air conditioners in terms of durability, functionality, and ease of installation.

• ‍ It's highly energy-efficient
• It's eco-friendly
• Offers superb cooling and heating efficiency ‍
• O ne of the quietest units
• Very lightweight and compact
• Easy to install and maintain
• Offers good value for money 
• ‍ Not suitable for other types of vehicles
• Not ideal for home use

MarinAire 11000 BTU/H Self-Contained Marine Air Conditioner

If you've been looking for a smaller but highly reliable sailboat air conditioner, the MarinAire 11,000 BTU/H AC can be your best solution. Like most MarinAire units, this self-contained AC comes with excellent low and high-pressure gauges to ensure that it works efficiently in all climates. This means that you won't have to worry about setting it manually; it will do everything automatically and that's how many boat owners love it.

Its superior centrifugal 360-degree rotatable blower will ensure that the entire cabin is easily conditioned and kept at desirable temperatures. In other words, you won't have to move from one corner of your boat to the other just to feel the cool or warm breeze. Like most boat owners, you certainly want a unit that carries on with its job without much fuss. Well, this AC unit is designed with a superb sound cover to reduce the level of exasperating noise that's widespread in most sailboat AC units.

This unit is designed with an excellent Toshiba R410A refrigerant that is not only eco-friendly but a true guarantee of superior efficiency. When compared to other affordable options out there, this AC unit has everything that you'd want in a perfect air conditioner for your sailboat. It comes with a remote temperature sensor, intuitive display, and more importantly, it's energy-efficient.

This is, without a shred of doubt, an innovative sailboat air conditioner that will take your sailing adventures to the next level. You won't have to worry about getting exhausted because the temperatures are so hot. It's easy to set up, install, operate well and will serve you diligently for many years to come.

• ‍ Comes with an excellent 360-degree blower
• It's lightweight
• It's easy to set up and install
• It's one of the quietest units
• It's sleek, modern, and compact 
• ‍ The control box is bulky
• The control panel is difficult to operate

Related Articles

I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

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The best marine air conditioners for your boat

Ranging from 6,000 to 72,000 BTUs – Our marine air conditioners offer an increased cooling capacity and at the same time are more energy efficient.

Self-Contained

Self-contained marine air conditioners are the best solution for boats with up to three cabins. Every cabin is equipped with a self-contained unit fit for the cabin's cooling / heating demand. CTM Self-Contained Marine Air Conditioners are high performance, quiet and compact.

Split System

Split system marine air conditioners are found in mid-to large-sized vessels, up to 80' in length. Split systems generally have the condensing unit in the engine room and the air handler(s) in the living area. CTM split marine air conditioners require less space in the living area and are quieter because of the separate compressor.

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The CTM Marine CT-6S 12VDC self-contained marine air conditioner comes with an inverter charger, allowing you to start and run your CTM Marine air conditioner on 12VDC power supply.

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Titanium Review for Seawater Applications

By: Robert Houser, ATI Wah Chang

“Extensive bio-fouling of titanium has been observed after only 800 hours of immersion in sea water. This is because titanium has no toxicity towards marine organism; it is an environmentally friendly alloy…”

“In applications where flow velocities need to be less than 8 ft/sec (2.4 m/sec), it is recommended that chlorine be added to the system. Chlorine has been found to be very effective and as little as 0.5 parts per million can successfully maintain a thermally clean system and prevent hard fouling organisms…”

“Titanium is a very noble metal. When coupled to other metals, titanium will be the cathode and the other metal will be the anode and corrode. This galvanic effect may create excessive hydrogen and be absorbed by the titanium, which is a concern because the material can become brittle and eventually break. If dissimilar metals have to be coupled, it is best to utilize insulation products.”

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Chillers Water Cooled

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Self Contained Water Cooled Chillers

What are VFD Controls?

Variable speed units are indeed more efficient and will save you about twenty bucks a month in electricity, however they are a LOT more complex, have many more printed circuit boards and are considerably more expensive to buy. The “boards” may be free with some manufacturers, but the service calls are not $$$$.

VFDs will reduce/eliminate the start up surge & flickering TVs and you can control the speed of the compressor, so most of the benefits of variable speed units are reaped with a very reliable, time tested and relatively inexpensive over the counter VFD controller. If you have single phase 220 our VFD units will have three phase compressors in addition to the VFD, so the surcharge is relatively small.

Self Contained Air Cooled Chillers

Chillers Air Cooled

FM 120CWAC-V

FM 120SSAC-V

Fm 120ssac-h, fm120cwac-h.

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Condensing Units - R417A / R22

Dometic R Series Condensing Units, R10-417 - 115V/60HZ, R417A with Mechanical Control (Not Included) 701110101

Dometic RX10 Condensing Unit 115V 60Hz , R22/R417a Refrigerant

Dometic RX16 Condensing Unit 115V 60Hz , R22/R417a Refrigerant (Discontinued)

Dometic R Series Condensing Units, R10C-417 - 230V 60HZ, R417A with Mechanical Control (Not Included) 701110200

Dometic R Series Condensing Units, R12CK-417 - 240V 50HZ, R417A with Mechanical Control (Not Included) 701112300

Dometic RM24C-417 - 230V 60HZ Modulating Condensing Units, R417A 701724201

Dometic RM24CK-417 - 240V 50HZ Modulating Condensing Units, R417A 701724202

Dometic RM30DC-417 - 230V 60HZ 3PH Modulating Condensing Units, R417A 701730501

Dometic R Series Condensing Units, R10-417 - 115V/60HZ, R417A with Mechanical Control (Not Included)  Dometic RX10 Condensing Unit 115V 60Hz 1 phase R22/R417a Refrigerant  Features Service ports on refrigerant lines and base valves...

Dometic RX10 Condensing Unit 115V 60Hz 1 phase R22/R417a Refrigerant  Features Service ports on refrigerant lines and base valves give easy access Vibration isolation mounts minimize compressor noise Environmentally safe R-417A...

Dometic RX16 Condensing Unit 115V 60Hz , R22/R417a Refrigerant Features Service ports on refrigerant lines and base valves give easy access Vibration isolation mounts minimize compressor noise Environmentally safe R-417A refrigerant Electrical box can...

NEW R Series seawater-cooled Condensing Units w/ mechanical controls (Not Included), 10,000BTU- 48,000BTUS 230V, 60HZ, R417A refrigerant. Type R models are designed for installation in the vessel's engine room or other mechanical...

NEW R Series seawater-cooled Condensing Units w/ mechanical controls (Not Included), 12,000BTU - 24,000 BTUS , 240 V, 50HZ, R417A refrigerant. Type R models are designed for installation in the vessel's engine room or other...

Dometic Remote RM Series Condenser Unit 24,000 to 42,000BTU Cool Five Independent Zones from a Single Unit. Dometic RM24C-417 Remote Modulating Marine Air Condensing Unit is the next generation of cooling-only air conditioning units. The RM series is...

Dometic Remote RM Series Condenser Unit 24,000 to 42,000BTU Cool Five Independent Zones from a Single Unit. Dometic  RM24CK-417 - 240V 50HZ Remote Modulating Marine Air Condensing Unit is the next generation of cooling-only air conditioning...

Dometic Remote RM Series Condenser Unit 30,000 to 42,000BTU Cool Five Independent Zones from a Single Unit Dometic RM30DC-417 - 230V 60HZ 3PH Remote Modulating Marine Air Condensing Unit is the next generation of cooling-only air conditioning...

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Air Conditioning Maintenance For Your Boat

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If you're lucky enough to have air conditioning on your boat, here's what you need to know about keeping that cold air cranking.

While boating is often about enjoying fresh air on deck, air conditioning can be a real game-changer, especially if you regularly overnight aboard in warmer climates. That said, AC systems are one of those onboard items that rarely get a second thought — until they stop working. Here's how to ensure your system keeps cranking out cool goodness in even the sweatiest of weather.

System Basics

Air conditioning systems come in a wide variety of sizes and configurations. However, they all contain three major components: an evaporator (where “boiling” refrigerant absorbs heat from the air), a compressor (which pushes the refrigerant through the system), and a condenser, where the refrigerant is cooled prior to being returned to the evaporator.

Marine air conditioning units are typically direct expansion designs, which means they pump refrigerant directly to air handlers located in the boat's interior. Larger vessels may instead use a chilled-water system, which cools and circulates cold freshwater through the air handlers instead of refrigerant.

The key to keeping your air conditioner operating reliably is regular maintenance. The first place to look for recommended maintenance is your owner's manual, but here are a few general tips that can be used to help maintain most any AC system.

1. Monitor the water flow. Marine air conditioners work by exchanging heat with circulating seawater. When problems occur, one of the most common causes is lack of water flow through the system. Signs of a saltwater system with restricted water flow can range from a lack of cooling output to increased frequency of on/off cycling of the unit as it struggles to operate.

Monitoring the water flow at the output discharge thru-hull is an easy way to gauge the performance of the raw water-cooling system. Checking the flow of discharge water is something that should be done each time you start your air conditioning system and occasionally during operation.

A discharge that's weak or reduced to a trickle is a sure indication that something's going on, and that something is not good. Most AC systems also incorporate a safety switch that turns off the compressor in the event of insufficient water flow. If you turn on your system and it runs for a bit, then shuts down, it's possible the safety switch has tripped and you need to check the cooling water system for restrictions or blockage. The control panel will also likely display a fault code, which can help narrow down troubleshooting.

2. Regularly check the cooling water intake strainer. The strainer is located between the raw water intake seacock and the unit's pump. Shut off the seacock, then access and inspect the strainer basket, ensuring it's clear of debris and growth. Once the strainer basket is removed, open the seacock briefly to ensure nothing is clogged in front of the strainer. You'll also want to carefully check the strainer basket for damage. The fine, stainless steel mesh baskets found in many A/C strainers can erode rapidly due to the constant flow of water, so keep spares on hand.

3. Check the condition of all hose runs and connections. Begin at the seacock and work your way through the system, from seacock to strainer to pump to air conditioning unit and finally the overboard discharge thru-hull. Look for issues such as leaks, corroded or broken hose clamps, chafe, and collapsed hoses or those showing signs of age or deterioration (such as cracks or swelling at the hose clamps). Seawater cooling hoses should also be double clamped where possible if there is sufficient hose barb to allow it.

4. Shut off the AC when you're not on board. Hose failure is never a good thing, but it can be particularly bad for owners who become complacent about continually running their air conditioning when they're not there. If a raw water cooling hose fails with no one onboard, the continuous pumping of seawater can easily sink a boat. A less dramatic reason to avoid running your air conditioning 24/7 is that the oxygenated seawater produced by this constant flow enables all kinds of marine critters to take up residence and thrive in your cooling system.

5. Periodically flush the condenser coils. Scale can build up on the condenser coils, restricting water flow. The coils should be flushed periodically with a weak solution of biodegradable acid to remove both scale and marine growth, typically every two to five years (depending on where the boat is located and how often the air conditioning is used). Back-flushing the system using dock or pressurized water is another option to try if the system is clogged.

6. Clean the air filters. In addition to cooling water, an air conditioner needs plenty of airflow to perform properly. Good quality, properly fitted air filters are crucial to protecting your AC unit against dirt and dust. Most systems have two air filters: one behind the return air grill and one at the evaporator unit. Air filters should be cleaned monthly as described in the owner's manual, typically by vacuuming or removal and washing with plain water, allowing them to dry thoroughly before reinstalling.

7. Inspect the condensate pan. This is the tray (sometimes two trays) below your air conditioning unit that collects the water (humidity) pulled from the air as it's being cooled. The two things to look for here are proper drainage and corrosion of the pan itself.

The pan should be plumbed so it drains overboard or into a sump, where the water is then pumped overboard. Allowing condensate to drain into the bilge is not recommended. A simple way to check the drain for proper operation is to temporarily plug the drain and pour water into the pan, which should then drain away within about 30 seconds of being unplugged.

If the drain hose is clogged, it can be blown clear with compressed air or pressurized water. If the pan is corroded, particularly to the point it can no longer contain the condensation, it should be repaired or replaced.

8. Check the pressure in chilled-water air conditioning systems. Maintenance requirements for a chilled water air conditioning system are similar to those for a direct-expansion system, however, they must be filled with water to operate properly (similar to refrigerant in a direct expansion system). They will typically have pressure gauges, allowing you to check for leaks or air in the system, which should also be part of your regular maintenance checks.

AC Winterization

Always follow the steps outlined by the manufacturer for winterization of your air conditioning system, such as during your fall layup. However, here are a few general tips for winterizing a typical, raw water-cooled system. Keep in mind that specialized systems (such as a chill water unit) will likely have additional requirements.

• Drain or purge the system of water from the raw water intake seacock to the AC pump (including the raw water strainer).
• Disconnect the hose at the outlet of the AC pump and purge the reminder of the system using compressed air.
• An alternative to the above would be to flush the system with antifreeze. Just be sure that the entire system is protected (e.g., seacock, strainer, pump, and the rest of the AC raw-water plumbing).

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Frank Lanier

Contributing Editor, BoatUS Magazine

Capt. Frank Lanier is a SAMS Accredited Marine Surveyor with more than 40 years of experience in the marine and diving industries. He’s also an author, public speaker, and multiple award-winning journalist whose articles on boat maintenance, repair, and seamanship appear regularly in numerous marine publications worldwide. He can be reached via his YouTube channel “Everything Boats with Capt. Frank Lanier” and website captfklanier.com.

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