Today, more and more people are looking to change their traditional heating systems for one that is more efficient and environmentally friendly. In this example we show you a case of change a diesel boiler for an air source heat pump . The air source heat pump is a very efficient and renewable system that uses the energy of the environment to heat or cool the house, as well as to heat the domestic hot water. This is why it is considered a system based on renewable energies. Thanks to the use of energy from the outside air, efficiencies of 300% to 400% are achieved, which means big savings in the heating bill.