sell the sled and call the propane guy to fill the tank! hey, you asked.
How about adding insulation. close off rooms, caulk everything that cold air can come in and around, close the garage door if attached. Basically make your living area smaller.
Newer house insulated to the max way past code.Thought about changing dampers to updstairs only but have 3 levels & furnace has to dispate heat or will crack a heat exchnager when running. Have at 62 now with electric heater & wood insert blowing full force but any suplemental heater or creative ways to keep heat in will be considered.