I have a 12.500 Btu Marine Air Systems unit on my Landfall 38 and it is undersized. At the time I installed it, I did the volume calculations etc. and thought it was the right selection but it isn't enough when the temps are above 95. The climate here in Annapolis is basically the same as yours (ocean City, NJ). Even with my 12,500 Btu unit, I would occasionally flip the breaker when I turned something else on to use momentarily. I lived aboard for 10 years. I added thermal insulation between the cabin top and the ceiling panels and this seemed to have helped.
If I were doing it all over again, I would install the 16,000 Btu unit and use a dedicated shore power cord and circuit so that when I wanted to use the toaster I didn't have to shut off the A/C. Bob Bob Boyer S/V Rainy Days (1983 C&C Landfall 38 - Hull #230) Annapolis, Maryland email: [email protected] blog: dainyrays.blogspot.com "There's nothing--absolutely nothing--half so much worth doing as messing about in boats.” -Kenneth Grahame
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