Air-source heat pumps (ASHPs) take low-level heat, which occurs naturally in the air, and convert it to high-grade heat by using an electrically driven or gas-powered pump.

 

Such systems typically use an air-source collector, which is located outside the building. The heat generated can be used to provide space heating for a building. ASHPs can also be driven in reverse to provide comfort cooling.

 

Site suitability

 

Installation of an ASHP involves siting an external unit and drilling holes through the building wall. This may require planning permission. Some degree of additional pipework may also be required. ASHPs are a good alternative to GSHPs where lack of space is an issue.

 

The performance of an ASHP varies dramatically with the external air temperature and this should be taken into account when considering the use of an ASHP system. In mild climates, such as that in the UK, frost will accumulate on the system’s evaporator in the temperature range 0-6ºC, leading to reduced capacity and performance of the system.

From July 2010, Heffalump have been undertaking one of the largest installations of Air source heat pumps yet commissioned in Europe. 540 KW of air source heat pumps are being installed to provide the heating requirements, the Pool, Spa Pool, and Air handling systems for the Spa and Gym areas of one of the most prestigious spa's and health clubs in the North of England, helping save vast sums on there fuel bills.