A heat pump is a device that uses electricity to move heat from one place to another. Heat pumps can move heat from a cool space to a warm space, or vice versa. This process is known as heat transfer. Heat pumps work by using a refrigerant that can absorb heat from one place and release it in another. The refrigerant is compressed, which causes it to become hot. This hot refrigerant is then passed through a set of coils, which transfers the heat to the air or water in the space. The refrigerant then cools down and is passed through another set of coils, which transfers the heat back to the space. This process is repeated over and over, allowing the heat pump to effectively move heat from one place to another.
Tom Schlotter, licensed home inspector.