Heat is extracted from the ambient air
The 5 step process of how Air Source Heat Pumps work
As the ambient air is pulled through the evaporator, refrigerant is circulated through the evaporator.
This raises the temperature of the refrigerant and turns the liquid refrigerant to gas.
The hot gas is then passed through a condenser where the heat is passed onto water.
Once the heat has been removed the hot gas turns back into a liquid to start the cycle again.