One of the things we do is use one of these THERMO CUBES that turns on at 35 degrees and turns off at 45 degrees. You can plug-in a 100ATT Light bulb fir the storage areas or inside some of the cabinets.
I also have air flow under a thermostat controlled DC fan pulling warm air from inside the trailer through the continuous connected cabinets around the walls of of off-road POPUP. I installed small vents between all of the connected cabinets. This help alot too...
We also supplement the heat using a low profile electric heater plugged into the pedestal 20AMP service. This helps alot cutting down on the furnace run time. Better to use their electric verses your propane... Like said above however you don't ant to totally shut down the furnace as it does route warm around your tanks.
Roy ken
