Does anyone have a camper with a heat pump ? Mine has an electric/gas switch on the thermostat heats good on propane and electric as long as there is propane but if it runs out of propane the electric doesn't work. When on electric and there is propane I can hear the scroll pump start and stop and it throws good heat. Is that by design ? how they are supposed to work ? Ive only used it to cool up until this year and it will freeze you out even with a 20 amp breaker and a long extension cord but in heat mode it needs propane to work proper. I have all the books that came with it but no mention on the heating system.