It is that humidity (or condensation) in the cabin that will do the most damage. Although not as extreme, the same phenomenon is constantly taking place on your boat, due to the temperature difference between the cabin (which is affected by water temperature and heat build-up during the day) and the air temperature outside. You see this happen in a rainstorm, when a hot air mass and a cold air mass meet, reducing the humidity in the atmosphere into water, or rain. When there is a difference in temperature, moisture forms. And no matter where your boat is docked, humidity and temperature levels vary, and there is a differential between air temperature and water temperature that's constantly changing. When you close off your boat's cabin to "protect" it from humidity, you may actually cause the humidity level below deck to rise. When you ventilate your boat, you want to do more than simply move air - you want to equalize the humidity levels inside and outside the boat, including areas between hulls, behind paneling and other enclosed areas that you don't normally see. While true even in a "dry" climate, this process accelerates in a humid climate and in cold water. Unattended boats generate humidity and moisture below because of water, air, and hull surface temperatures that are never identical and always changing.
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