Question

Air-to-air heat pumps are most practical to operate in areas where the lowest winter temperature does not go below _______ °F?

Answer 1

Air-to-air heat pumps are most practical to operate in areas where the lowest winter temperature does not go below 40 °F.

Step-by-step explanation:

Air-to-air heat pumps are most practical to operate in areas where the lowest winter temperature does not go below 40 °F. This is because heat pumps work by transferring heat from one place to another, and if the outside temperature drops below a certain point, it becomes difficult for the heat pump to extract enough heat from the outside air. In colder climates, other heating systems like furnaces may be more suitable.