We we were concerned about frozen plumbing and consulted Monaco support. They advised that running the furnace would help protect the systems by keeping the basement warm. So we are using the electric heat and a couple of ceramic heaters down to about 28 degrees, and then firing up the furnace for the night but keeping it set pretty low - between 60 and 63 or whatever it takes to be just comfortably cool. We also have an electric mattress pad but don't need to set it very high. Also two warm little furbodies in bed with us don't hurt any.