Air Source Heat Pumps - GOV Subsidy Still Available!

You have probably got two heat pumps already in your house, a fridge and a freezer. They expand the ambient air they suck in from around them causing it to cool (PV/T = K), before that cold is pumped into the insulated box you call a fridge/freezer. An air source heat pump sucks air in from the fan unit mounted outside and compresses it causing the air to heat up. That gained heat can be pumped into a new super insulated hot water tank (thermal store), around your radiators or into new underfloor heating or all of the above; your choice.