myredracer wrote:
In colder weather, you need to ventilate the interior to remove moisture laden air. If you don't, you can end with issues like mold, rot and delamination. An electric dehumidifier may be needed if you plan to use your camper often in cold weather. Cracking vents and windows and/or running a fan means you lose some heat. Don't seal everything up with in an effort to retain heat.
Very true of the propane furnace, which can put out a lot of moisture. An electric space heater will actually dry out the area, not introduce more humidity.