You might also consider installing a ventless, catalytic heater as an auxiliary heat source. They are inexpensive, very efficient, and use no electricity at all. There are several brands available, but my preference is the Olympian Wave series from Camco. They offer 3000, 6000, and 8000 BTU models.
We boondock a lot, so to save battery power, I installed the 3000 BTU model in the bedroom. At night, I turn it on, and set the furnace to 60, just in case. Even in sub-freezing temperatures, the furnace rarely, if ever, turns on.
Joel
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Retired electronics engineer. Avid paddler & birder.
2011 Silverado 2500HD, diesel, 4x4,crew cab, 8' bed
Palomino Puma 253FBS (27' 5er) & '94 19' Class B
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