Heating the Rig in Winter

I lived in N. Fl. for many years. Run the furnace on nights in the 20 if you are concern. I have been in wyoming in early April and October. Night time temps in the 20 or 30. I use space heaters to heat the rig and monitor the basement with a thermomitor. If the basement gets close to 32 I hit the furnace. I have a heated water hose and keep the grey tank open, never had a problem. I am looking into Cheap Heat. That will solve all these concerns. It seems to work well from what I have read and been told by those who have it. I think it is worth the expense if you fulltime.