When we had our trailer I bought a ceramic heater and fastened it to the wall by the bed. It looked like a piece of floor tile, about 16"x16", about 3/8" thick. Took the chill out of the BR area. Had always considered buying a couple more to put throughout the trailer, but gave the trailer to daughter. The heater got hot-you could put your hand on it and not get burned-but it was a little uncomfortable. I bet 2 or three of these throughout the camper would make the area comfortable on chilly nights, but you probably couldn't heat it if it were in the 20-30s area. No fan or moving parts, just looks like a piece of floor tile.