Air-source heat pump (ASHP) systems, also known as air-to-air heat pumps, can both heat and cool your home with the same unit, using refrigeration technology to transfer heat. The refrigeration system consists of a compressor and two coils made of copper tubing. In the winter, the unit extracts the heat from outside and transfers it into your house to keep you warm. In the summer, the process is reversed, and the unit removes heat from your home and releases it outdoors, keeping you cool. Learn