The air supply temperature of a warm air furnace is typically hotter than that of a heat pump. That’s because a standard furnace delivers air in the 130-140 degree Fahrenheit range, while a heat pump’s usual temperature is 90-100 degrees Fahrenheit.

The air supply temperature of a warm air furnace is typically hotter than that of a heat pump. That’s because a standard furnace delivers air in the 130-140 degree Fahrenheit range, while a heat pump’s usual temperature is 90-100 degrees Fahrenheit.