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Old 05-31-2018, 08:02 AM   #21
CaptTom's Avatar
City: Southern Maine
Country: USA
Vessel Name: Cygnus
Vessel Model: Prairie 36 Coastal Cruiser
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Originally Posted by psneeld View Post
Whether in Florida or NJ, if it is 90 degrees outside and well up near or past 75 percent humidity and the emgine just got shut off....even 16K for a main salon full of windows isn't necessarily enough.'

Yes, by the time the engine cools and the sun gets can chill meat.....but in the you want an AC that can do the job?...or have one working overtime just to keep up with being comfy?

Most people do not realize the home sized air conditioner for a nominal bedroom cant be compared to a marine equivalent. Lots of reasons such as air transfer, insulation, windows per cubic foot, etc...etc....
This! ^^

Unless you're one of those tough-as-nails types who never needs air conditioning, when you need it, you REALLY need it. Don't design for the minimum, design for those hot days. We endured a 3-day heat wave in Eastport, Maine (where even homes and businesses have no air conditioning) and were thankful to find a dock close enough to an outlet that we could run a long extension cord to our shorepower cord to run the AC.

I strongly recommend two 16K systems. You can cool the whole boat using one if it's not too warm, or if you can only scrounge enough power to run one, or if one fails.

The rest of the time, run whichever or both, based on which spaces you're using, or not using.

Carefully consider ducting options. With my boat, each unit blows into it's own cabin, as well as into the saloon. I can close off vents, but usually the balance seems about right.

Another big decision is where to put the thermostats. You don't want them in a "dead" spot with no air movement, a hot spot or a cool spot. Ideal would be some sort of remote you could put wherever you need it, but I haven't seen those for marine units. You can always put off the decision, and try out different locations over the season before permanently mounting it.

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Old 05-31-2018, 06:27 PM   #22
Scraping Paint
City: Lutz
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2 16K btu units will need a 50 AMP feed

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Old 05-31-2018, 06:50 PM   #23
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City: Ohio
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Vessel Name: Summer School
Vessel Model: Marine Trader 34 double cabin
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Originally Posted by geoleo View Post
2 16K btu units will need a 50 AMP feed

Ended up installing 16k btu ocean breeze unit under the port settee and ran duct to the aft cabin and the main cabin. I have only temporarily mounted the thermostat in the aft cabin since that is where we sleep. We may end up putting a small unit in the forward cabin in the future.
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Old 06-08-2018, 01:22 PM   #24
Scraping Paint
City: Lutz
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Originally Posted by alormaria View Post
I'm going to jump in the pool with you. I am planning on installing the a/c unit in the saloon settee but the first one up by the refrigerator box. The duct would run under the port deck back to the aft cabin, up to the counter over the fridge and forward to the forward cabin. I had centered on 16K myself after trying a home unit.
Yes I have the webasto-16K my 2nd one---you might want to consider the Mermaid 16500 for a lil more output--- call them direct for best price- they might even have a recon unit for you if your lucky--then get all fittings /duct thru SE Marine air in Ft Lauderdale

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