Energy term of the day: air-source heat pump

An air-source heat pump (ASHP) is a device that transfers heat from the air outside a building to the inside, or vice versa.

The versatility of ASHPs in domestic settings can be useful, in that they can be used to either cool down a hot building during the summer, or heat it up during the winter.

Made up of two major components, the ASHP uses an outdoor heat exchanger coil, which extracts heat from ambient air, and an indoor heat exchanger coil, which transfers the heat into water-filled radiator systems or under floor heating systems.

Wikipedia definition.