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Another reason that it can be cycling on and off is the cut-out in the wall behind the thermostat is way, way bigger than it needs to be and allows cold air in the wall panel to affect the thermostat. I removed it from the wall and patched the hole with foam and duct tape. The thermostat wires now come through a tiny hole in the tape, not a huge gaping hole in the wall.
...and, these rigs are just not very efficient at holding in the heat when it is very cold outside. When we stay at an RV park, we use a couple of electric ceramic heaters to keep tolerably warm at night. I can't sleep very well when the furnace kicks on and off all night long. When we boondock (as we do most of the time) the furnace fan sucks the batteries down too quickly, so we use a catalytic propane heater during the day, and at night we generally leave the furnace off and use goose down comforters to sleep under, unless it is freezing temps outside, then we set the furnace at around 60F to keep the pipes and tanks from freezing up.
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