An electric air-source heat pump has two main parts as shown in the illustration below:
- The outdoor unit includes an outdoor heat exchanger (1), a compressor (2) and a fan.
- The indoor unit contains an indoor heat exchanger (3) and a fan (4) that distributes warm or cool air to your duct system.
Download PDF
During the heating season, the outdoor unit collects heat from the outside air through the outdoor heat exchanger and pumps it to the indoor heat exchanger. The heat is then distributed through the ducts in your home by the blower fan. A secondary heat source, typically a furnace, serves as a backup for days when temperatures drop below between 25 and 35 degrees.
In the summer, the heat pump operates like a regular air conditioner. It pumps heat out of your home and circulates cooler air to keep your home comfortable.