What was the temp? Below a certain point the heat pump will fire the propane furnace. This is similar to "auxiliary heat" on some household furnaces that will use electric or gas if the heat pump can't reach the temperature set point on its own.
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J. B. Smith
Dayton, OH
2012 Keystone Cougar 331MKS
2018 RAM 3500 Laramie 6.7L DRW
B&W Companion
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