I have a Marine
Air 12,000 BTU unit for my steel
41' footer. It's 120 VAC, so it needs an inverter
. It heats AND cools, but stops heating
below 5C, which is not likely an issue for you.
If you can afford it, I would go with the 12,000 BTU unit as the 6,000 BTU unit will work hard to keep a 38 footer cool.
You will also need a fairly robust inverter
. The 6,000 BTU unit's AC water
pump">raw water pump should kick at about 9 amps, but the 12,000 BTU needs 17 or so, after which it falls back below 10 amps.
So while it's easy to buy a decent air conditioner setup, what is hard is devising enough battery
capacity and inverter to make them run.
You might have better luck with an "indoor room air conditioner" in the sleeping cabin
, for instance, and fans and wind
scoops in the rest of the boat. When it's stinking hot, seal up the boat except for the dorades and run the fans to move the "cold cabin" air about.
If all this seem complex, it is. The upside is that a cooler boat means the fridge doesn't work as hard and you don't need to pass out so often.