An air source heat pump, sometimes referred to as an air-to-water source heat pump, transfers heat from the outside air to water, which heats your rooms via radiators or underfloor heating. Installing an air source heat pump is a low-maintenance solution that will reduce carbon emissions and save money on your heating bills. They work in a similar way to a fridge or air conditioning system, the difference being that they produce warm air. Air source heat pumps still generate heat even when outside air temperatures are as low as -15°C.

Energy Savings Trust explains how the heat pump absorbs the heat from outside air into a refrigerant. This is then compressed within the model to increase the temperature, providing both heat and hot water into your home.