Renewable Energy Air Source Solar Solar Thermal
Ground Source
Air Source
Solar PV
Solar PV
Solar Thermal

Air Source Heat Pumps

Air source heat pumps are used to absorb the heat from outside to heat the inside of buildings. There are two types air source heat pump systems available. Air-to-water systems heat water to provide heating through an underfloor system or through radiators. Air-to-air systems take the air from outside to provide warm air to circulate through a building.

We offer our air source heat pumps to our customers based in

Air Source Heat Pumps Benefits

Air Source Heat Pump

Air source heat pumps have many benefits which are similar to ground-source heat pumps. Neither system requires external fuel to use or store and they run on electricity which eliminates any need for gas, oil or solid fuel. The main advantage of air source heat pumps is that they need less space to install compared to ground source heat pumps. Air source heat pumps are more suited to urban homes as they can be fitted using less space.

How Air Source Heat Pumps Work

Air source heat pumps work in a similar way to fridges that use refrigerant to take heat from the inside to keep food cool except they extract the heat from outside and use it to heat your hot water and home. Air source heat pumps have three main parts:

Air Heat Pump
  • The evaporator coil takes heat from the outside air.
  • The compressor circulates the refrigerant through the heat pump and compresses it to the temperature required for the heat distribution system.
  • The heat exchanger transfers heat from the refrigerant to water or air.

The heat generated using an air-to-water system is used to heat water to circulate through radiators or underfloor heating or water in a storage tank. Heat pumps produce water that is lower in temperature compared to standard boilers making underfloor heating a very effective option. With an air-to-air system heat is used to create warm air which is then circulated around a building by fans.

Air source system efficiency is measured by a coefficient of performance (CoP). CoPs for these systems normally range between 3 and 4 units making them equal to ground-source heat pumps. For each unit of electricity that is used to power the pump, only 3-4 units of heat will be produced which makes it a very effective way of providing heat for a building.

It is even possible for air source heat pumps to extract heat from the air at temperatures as low as -15°C.

Is It Suitable For My Home?

The following issues will need to be considered if you are wanting to install an air source heat pump.

  • Space will be needed on the outside wall of your house to be able to fit the evaporator coil.
  • Air source heat pumps should be able to cover heating requirements of a property that is well insulated. It is very essential that the home is properly draught proofed and insulated due to the lower temperature. Proper insulation will lower the demand for heat therefore making the system more effective.
  • The fuel being replaced will have to be considered. If it's coal, LPG, oil or electricity then the payback will be better than gas. Heat pumps are a good solution in areas where gas isn't available.
  • The heat distribution system. Air source heat pumps are used to heat water to be circulated through conventional radiators but underfloor heating is much more effective as the temperature of the water/air produced is lower.
  • Is the system for a new building development? Costs can be reduced if the installation is combined with other building works.
  • If you want to reduce the CO2 emissions from your home then you can install solar PV or purchase a green electricity tariff or any other form of renewable energy such as solar thermal or biomass to generate electricity to power the pump and compressor.

Costs and Savings

A normal 6kW system, suitable for a properly insulated property costs about £7,000 to £10,000 installed.

An air source heat pump could save almost 6 tonnes of carbon dioxide a year and around £760 a year on heating bills when properly installed in an electrically heated home. Savings will vary depending on the fuel that is replaced.

Fuel Displaced £ Saving Per Year CO2 Saving Per Year
Gas £185 830 kg
Electricity £760 6 tonnes
Oil £370 1.3 tonnes
Solid £325 5 tonnes

All savings are approximate and are based on an air source heat pump providing 100% of space heating in a detached property.