My concern Texashighsheriff isn't the amount of electric heat to stay warm, but without the furnace running at least some there isn't any heat getting to my tanks/plumbing, etc. The electric fireplace plus one electric oil filled radiator keeps the entire back of the 5'er nice and toasty and I only really run the fireplace early in the morning to knock the chill off. The oil filled radiator has a more accurate thermostat so I use it during the day when above freezing.
At night I turn the main thermostat to 60 and turn off the electric heat. I want the furnace to come on some during the night which is doesn't do much, but just enough. Right now it is 13 degrees outside and I had rather burn a little propane vs have something freeze and break. At night in the bedroom I have a ceramic cube heater that works well with the hall and bath to hall doors closed and the heat up there doesn't effect the furnace thermostat setting.
Maybe I'm being a little over cautious, but I full time and this is my home. I don't want it out of service because I wouldn't burn a little propane at night.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof