Join Date: Dec 2002
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Rep Power: 14
Marine Air Systens have a good tutorial at:
Rule of thumb for sizing powerboat A/C:
14 BTUH/Cu. Ft. Below Decks
17 BTUH/Cu. Ft. Above Decks
I use 15 BTUH/Cu. Ft. for sailboats.
You may want to consider "reverse-Cycle" heating as well.