Air source heat pumps (ASHP) is a process that by using the principle of vapor compression, transfers the hot air from a place to another exactly in the same way as the system of a refrigerator does. Before looking at the details of the technology, it is important to note that air at a temperature above absolute zero always contains some heat and many of these pumps manage to extract heat even at low temperatures as -15 C degrees. The pump consists of two exchanger coils: one outside that catches the hot air and an internal one that pushes the air through a heating system.

The Technology in a Nutshell : Air source heat pumps systems consist of four major elements that allow the refrigerant to pass from the liquid state to the gas: a compressor, a condenser, an expansion valve and an evaporator. When the refrigerant passes through the heating system, the high temperature (usually 100 degrees or more) transforms it into vapor or gas while the energy produces heat. The gas then goes through the compressor that increases its temperature, and then through the expansion valve that makes the hot air enter the building. Next the hot air passes in a condenser that turns the gas into liquid again.

The heat produced by the energy in the evaporation phase passes through the heat exchanger again to restart the cycle and it is used to make the radiators work, for domestic, swimming pool, commercial & industrial hot water.