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Heatpump to furnace
If I leave the switch on Heatpump (45 degrees) & the outside temp falls below freezing, will the furnace automatically turn on? Or do I need to leave the furnace running? I will be leaving my unit for several days & it warms up in the day, but could get down in the 20's at night. I don't want to risk running out of propane while I'm gone.
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