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Old 05-02-2018, 05:30   #16
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Location: Wilton, CT
Boat: Endeavour 37
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Re: Sizing Air Conditioning Units

We have a 5000 btu window-type unit ($100 from Home Depot) that I fit on a board that slides into the companionway opening. We only use it when on shore power, but have tried it running on our Honda 2000, and it runs fine without any issue. This unit cools our Endeavour 37 nicely when it's quite hot outside.
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Old 05-02-2018, 05:48   #17
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Re: Sizing Air Conditioning Units

Check what the manufacturer specs as the starting point. Using area or volume runs into a problem as how well the area is insulated and how much of a greenhouse the interior is, makes a huge difference.

If you only want to cool your cabin during sleep, you can get a smaller unit that is just ducted to that space.

If you like air/con now, you will like it on the boat. Yeah, you can survive without it but why be uncomfortable.
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Old 05-02-2018, 05:51   #18
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Re: Sizing Air Conditioning Units

Quote:
Originally Posted by pathlesschosen View Post
Iíve always wondered about buying a cheap Home Depot portable AC unit exhausting it thru a porthole. Powered by the Honda generator. Or shore power when at marina or in the boat yard.
We did that one summer when the built in unit died. It worked pretty well but it wasn't the prettiest option. The critical thing is to have a place to put it where you can route the hose to an open porthole.

If you do get one, splurge on the dual hose unit. The single hose units use interior air to cool the condenser, so it's constantly sucking the cooled air out of the cabin. The dual hose ones use outside air, so even though the BTU is technically the same, they cool better.
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Old 05-02-2018, 08:55   #19
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Location: New England
Boat: lagoon 380 s2
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Re: Sizing Air Conditioning Units

Quote:
Originally Posted by pathlesschosen View Post
Iíve always wondered about buying a cheap Home Depot portable AC unit exhausting it thru a porthole. Powered by the Honda generator. Or shore power when at marina or in the boat yard.
There are some threads about that here. Window units on a cat might be hard compared to mono with companion way hatch. The free standing units might work better. But these units are not Marine rated, so might not last long. There are some Marine units that you put on deck and the air feeds through a hatch over the bunks. I think west Marine has them at about 1k.
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