Re: Condensation inside sailboat...
I have never had a condensation problem on my boat in any weather , thanks to an inch and a half of spray foam, despite living aboard in all weather in BC winters. Insulation on everything is the key. A friend ,living on a cement boat, had condensation problems, until he installed a dehumidifier. It took 5 gallons out of the air in ,the first few days, then it tapered off and things began to dry far more quickly. It takes only 2 degrees of temperature difference between the temp of a surface and the air, for condensation to form.
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"