Air source heat pumps are easier to install than a ground source heat pump, therefore cheaper as well. They also provide space heating and hot water for your home.
We are installing more Air source heat pumps, they are now in demand by both building contractors and the domestic housing market.
The following link is from which magazine, it points out the cost and saving you could make once the solar panel system is installed.
Just to explain how it works – Air source heat pump extracts heat from the outside air in the same way that a fridge extracts heat from its inside. It can extract heat from the air even when the outside temperature is as low as minus 15° C.