Hi,
Welcome to the forums!
What to do about condensation?
The cause of the condensation is the walls are below the dew point temperature. If the walls can be made warm enough the problem disappears. Running a fan to circulate air may help to raise the temperature on the surface of the wall.
One other solution is to reduce the relative humidity inside the RV.
The easiest way to do that is to open a roof vent a bit, find the furthest window from the vent and open that a bit. An electric heater near the window will improve that and keep you warmer. I'd suggest a low wattage radiant type, or a small oil filled (if the oil filled can be on a shelf so the air from the window passes over the fins.)
I know opening a vent and window when it is cold seems counter intuitive, but it does work.
Another possible solution is an electric dehumidifier--but the cooler it is the poorer they work. They are generally energy hogs, some what bulky and definitely noisy.
The above is from this series of posts under full time RV'ing:
https://forums.goodsamclub.com/index.cfm/fuseaction/thread/tid/24160748.cfmI suggest reading it soon!
