What energy source does an air-to-air heat pump primarily rely on?

An air-to-air heat pump primarily relies on electrical energy to operate. This type of heat pump moves heat from the outside air into a building during the heating season and reverses the process in the cooling season. It uses electricity to power the compressor and fans needed for heat exchange. By extracting ambient heat from the outside air, even in colder temperatures, the heat pump can efficiently provide heating without the need for combustion fuels like natural gas, propane, or wood pellets. The reliance on electrical energy allows air-to-air heat pumps to be versatile and environmentally friendlier when paired with renewable energy sources, making them a popular choice in residential heating and cooling systems.