good luck and a couple heaters would probably be a good investment especially if you're on unmetered electric. During superbowl weekend I had people stay here at the house and a couple slept in the camper. I put our eden pure type heater in there (brand escapes me at the moment) and I let it run constantly and turned the heat off during the day. It kept the camper about 60 degrees during the day and the highs were in the upper teens low 20's. 2 of those in there would probably work perfect. If you're using water though you'll want your furnace on some to keep the underbelly warm so things don't start freezing up on you.