New AF - a few winter questions.

I don't have your camper but I have camped in my Lance down to 0*. Condensation mostly occurs when warm moist air contacts cold surfaces. eliminate exposed cold surfaces and most condensation isses are greatly reduced. This means coverying the windows and frames, skylights, the entry door with some form of insulation. I use a mix of 1" thick Closed Cell Foam and Refletix. It hit 15 on our trip this last weekend and there was just a small spot of moisture that reqired a single pass of a wash cloth to remove. We had two adults and 3 dogs inside. The only open vent was the exhaust flap for the oven, as all the windows and vents were otherwise sealed. At night we have flannel sheets and a thick down comforter on the bed. The furnace is set to minimum which is about 50*. I have two group 31 AGM batteries and all LED lights so far I have never in 6 years run the batteries down from using the furnace at night this way.