Air Source Heat Pumps

Air Source Heat Pumps

Air source heat pumps absorb heat from the outside air and convert it to useable heating. They are a proven technology and can operate in temperatures as low as -20° C.

Heat pumps can be connected to an existing heating and hot water systems, however, compared to a standard boiler they produce lower temperatures over longer periods of time. They are therefore best suited to under floor heating. This means that to heat your home efficiently during the winter they may need to be left on 24/7.

How do they work?

The principles of air source heat pumps are similar to that of a fridge or freezer. Coils are filled with a refrigerant which has a low boiling temperature, around -40° C. Because the gases in the coils are so cold, they can extract heat from air temperatures as low as -20° C. Outside air is blown over the coils which increases the temperature of the refrigerant. The gases are then compressed, increasing its temperature in the process. The gases then enter a condensing heat exchanger where they meet a coil containing part of the water in a heating system. This heats the water and in the process cools the refrigerant, starting the cycle all over again.  

The benefits

Air source heat pumps can reduce your fuel bills, especially if you are replacing an electric heating system. They require little maintenance and can reduce your carbon footprint. Compared with a ground source heat pump, there is no need to dig up your garden, therefore they are easier and quicker to install. They are fuel efficient and can be connected to your existing heating and hot water system.

The Cost of Air Source Heat Pumps

Costs for a typical system suitable for a detached home, range from approximately £6,000 to £10,000 including installation. The size of your home and how well insulated it is will determine the running costs. The price of the electricity used to power the system can be offset, typically for every unit of electricity used It produces 3 units of heat. However it may not produce actual savings where mains gas is available, as gas is about a third of the price of electricity. In the UK you may qualify for a grant of up to £1200, from the government towards installation.

To reduce your bills and carbon footprint even further, a photovoltaic system can be installed, and used to power the air source heat pumps.