Whether ground source or air source, heat pumps can transfer significantly more energy into your property than it uses to extract it, helping to lower fuel bills and reduce environmental impact.
Heat pumps work best in well insulated properties and, due to the low water temperatures achieved, are ideal when used with underfloor heating systems. Heat is delivered at lower temperatures over much longer periods than in a radiator system.
In a well insulated property every kilowatt hour of electricity used to power the heat pump can provide up to three kilowatt hours of free energy. This ratio is known as the Coefficient of Performance. In this example the CoP would be 4 meaning the efficiency of the heat pump is 400%.
Most systems use weather compensation to allow the heat pump to vary its operation based on the temperature requirements of the property in relation to the outside air temperature.
A ground source heat pump needs external space to install an underground piping loop. The size of the loop depends on the size of the property but needs to be approximately 3.5 times the size of the space you are heating.
Air source heat pumps extract heat from the outside air in the same way as a fridge extracts heat from its inside. They are often less efficient than a ground source heat pump, but are relatively easy to install requiring no underground piping system.