I guess it's not looking like the 12 volt has to much positive feedback. The boat doesn't have room for an on board generator so maybe a portable with a 110 volt unit is the better way to go. You don't know if you don't ask, thanks for the replys! Steve

We have a unit that you can check out at http://www.12voltac.comOur unit uses true 12 volt dc compressors and varies its current draw based on demand from the thermostat.

Check out a video of the 4000 btu.http://www.youtube.com/watch?v=k_7QFqBPvic