Air-source heat pumps

An air source heat pump will extract heat from the outside air, converting low grade heat into useable energy, by passing it through a compressor where its temperature is increased. The heat is then used for space heating and hot water. An air source heat pump will work at temperatures as low as -20°C outside. Air source heat pumps are cheaper and less disruptive to install than a ground source heat pump. They are installed outside your home and can be fitted to a wall or placed on the ground. Air source heat pumps produce lower carbon emissions than most fossil fuel appliances. They can convert 1 kilowatt of electricity into 3.5 kilowatts of heat, meaning they can be 350% efficient. For comparison, an A-rated combination boiler can only turn 1 kilowatt of gas or oil into 0.9 kilowatts of heat, meaning they are 90% efficient.