How Air Source Heat Pumps Work

Air source heat pumps work in a similar way to ground source heat pumps except they filter air outside instead of heat from the ground.

There are two types of air heat pump systems

  • Air to air: fans, which are commonly used in commercial buildings
  • Air to water: wet central heating which is most common for domestic houses.

Air pumps are normally fitted outside the house and work on a similar principle to ground heat pumps.

A refrigerant liquid (made of water and antifreeze) is passed through pipes which are heated by the heat in the air outside.  A heat exchanger condenses the heated liquid to a higher temperature, which is then pumped into the central heating system or fan.


How are Air Source heat pumps installed?

A box will be mounted on the outside of the building. This box will contain the pipes which the air will pass over to heat the refrigerant liquid. For this reason you will need to have sufficient space on the designated wall to mount the box and allow for air to flow around it.

The heat exchanger and pipes carrying the higher temperature liquid will be installed inside the property.


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