|
The heat pump merely transfers heat in the outside air to the system refrigerant, which then releases the heat into the coil in the furnace, which circulates the heated air in the coach. Once the outside temperature gets close to freezing (32 F, 0 Celsius), the heat pump can no longer extract heat from the outside air. Probably a good rule of thumb is to switch to LPG or electric heat when the outside temperature is forecast to be lower than 38 - 40 F. There may be more accurate information in your coach's manual on the HVAC system.
|