To save out battery power on colder nights, I cover the air outlets in the LR and Kitchen and leave the one in the BR open so it get most of the heat. I turn the thermostat down to the low 60's to keep the furnace cycling to a minimum. The bedroom stays warm enough for sleeping and it doesn't drain the batteries too much. It works well for us, but we do have 4-6v deep cycle batteries - a must!
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