What is an air source heat pump?

Most home heating systems either burn fuel or convert electricity into heat. But heat pumps are different because they don’t generate heat. Instead, they move existing heat energy from outside into your home. This makes them more efficient. Since they deliver more heat energy than the electrical energy they consume; a heat-pump system typically costs less to run than a traditional heating system too.

How does an air source heat pump work?

An air source heat pump works much like a fridge in reverse to heat your home.

 

  1. Outside air is blown over a network of tubes filled with a refrigerant. This warms up and it turns from a liquid into a gas.
  2. This gas passes through a compressor, which increases the pressure. Compression also adds more heat – similar to how the air hose warms up when you top up the air pressure in your tyres.
  3. The compressed, hot gases pass into a heat exchanger, surrounded by cool air or water. The refrigerant transfers its heat to this cool air or water, making it warm. This is circulated around your home to provide heating and hot water. Meanwhile, the refrigerant condenses back into a cool liquid and starts the cycle all over again.