How an air source heat pump works
An air source heat pump (ASHP) works by using liquid refrigerant moving through copper coils both inside and outside the home to transfer heat from the exterior air to the living space. Even cold air contains some heat. The refrigerant extracts heat from the outside air and evaporates in the coils located outdoors. It then flows to the coils inside the home, where it recondenses and releases the extracted heat. In warm months, the flow can be reversed so that the heat pump works as a cooling system.