We just got back from Utah a few weeks ago in our Thor Siesta 24SS. The last two days we had 9 degrees at night and 20 degrees during the day. I used the small electric heater to maintain the heat above the thermostat for the furnace. We used about 1/2 tank of propane for the 6 days we were there in the snow. We slept at night inside the motor home. I also covered the all of windows to reflect the heat inside which made a good difference. I plan on keeping the window covers for summer camping to help keep it cooler inside in hot climates.
Paul
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