I find the camper heaters are hard to regulate unless you add a digital thermostat. We primarily use the a 1500 watt ceramic heater, it first started out in my parents PU (southern unit with no heat). We use it as our primary heat in the HTT now. We have added an electric mattress pads, they are very nice, and make it almost impossible to get up, some mornings. Adding things like Pugs and reflextix to the windows will help. Just remember you are in a fancy tent.
My neighbor has a very old PU he uses for hunting. He wraps the whole thing in Reflextix. It looks a bit like an alien space ship, but he says it stays nice and warm.
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