Extract air from outside to heat your home and water. It can also be used to cool your home.

What is an Air Source Heat Pump?

An air source heat pump (ASHP) is an energy efficient way of heating a home. An air source heat pump is an electrical device that extracts heat from one place and transfers it to another.

It uses a refrigerant system involving a compressor and a condenser to absorb heat. This heat is then circulated around the home through a central heating and hot water system. Furthermore, heat pumps can also operate for cooling too.

The Benefits of Air Source Heat Pumps

There is no better time to consider going green to heat your home. Air source heat pumps and other renewable energy heating solutions have become very effective and reliable. The benefits of using an air source heat pump are:

  • Reduce your carbon footprint by using renewable energy. Generate less CO2 emissions as pumps are high efficiency and run using electricity.
  • Cheaper to run than Oil or LPG alternatives.
  • Ideal to use with underfloor heating.
  • Uses the same technology as our fridges and freezers and these require little or no maintenance.
  • Can be used to provide cooling in the summer months.
  • Heat pumps are included in the Renewable Heat Incentive (RHI) which makes them a viable financial investment.
  • Compact in size and highly efficient.

Less CO2

Highly Efficient

Heat & Cool


Installation Process

Installation of an air source heat pump is easier and less expensive to install than a ground source heat pump as there is no collection pipework to install into the ground. The system can be installed on to an existing heating system although some radiators may need to be changed.

Air source heat pumps are not suitable for all properties though and other alternative renewable heating solutions, or a combination maybe more effective. Therefore, we recommend you speak to our installation team for professional advice and a free of charge quotation.

What to Consider?

To help our customers and provide some guideance, we have produced the information below.

What supplies your heating and hot water presently?

Cost of installation can vary depending on what heating system you currently have. For example, is your home gas or oil? Does the heating system have a cylinder or is it a combination boiler?

If you require the heat pump to provide hot water, then a new high efficiency cylinder has to be fitted as well as an expansion vessel and additional space for a 30 or 50L volumiser/buffer unit.

Do you have radiators?

Typical a gas boiler flow temp is 70 degrees. Whereas, an air source heat is between 30-45 degrees. With a heat pump running at lower temperatures the radiators may have to be larger to counteract this.

Additional information: As the system takes longer to heat from cold, the heating is left on for longer periods of time. The control temperature is turned down overnight and when the house is unoccupied, rather than being switched off completely. Air source heat pumps work well with underfloor heating.

Do you have a suitable position for an air source heat pump outside?

Depending on the output of the unit, it is approximately 1000mm wide x 1418mm high x 330 deep.

Ideally, the heat pump should be positioned in a South facing location. If floor standing, it has to be 300mm away from the wall on a suitable level base. It can be wall hung, which reduces this clearance to 150mm. Unit clearances of 300mm from the top, 600mm from the controls side, 100mm from the other side and 600mm from the front is required.

Insulation – Are the house walls, floors and roof well insulated?

Due to the lower running temperatures of a heat pump, it is vital that heat loss is kept to a minimum, the more insulated a property is, the more effective and efficient the heat pump will be.

Do you know about the Boiler Replacement Grant - Government Grants?

The government is laucnhing a new scheme to replace the Green Homes Grant. Discover more here.


Renewable Energy


The government will provide grants to encourage property owners to install low carbon heating systems such as heat pumps, through the Boiler Upgrade Scheme (BUS). These grants will help property owners overcome the upfront cost of low carbon heating technologies. To discover more please see visit our main renewable energy page.