One thing to keep in mind is that electricity is probably cheaper than propane for heating (especially if you're not getting charged for electrical usage in the park you're at...). I've got a 1500 watt electric heater stowed in the TT for those occasional times we need heat. (I probably need to add a second one as my XYL prefers it to be warmer.)
I set the furnace to about 60 and let the space heater take it from there. That way if it gets really cold outside, the TT temp never gets lower than 60. Down to around freezing, the furnace only comes on very occasionally at night.
Doug
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