The heat pump is considered as a renewable source of heating and cooling because it draws the greatest amount of energy yields from the environment in contrast to conventional heating systems that burn fossil fuels such as oil or natural gas for heating. It works as a machine of absorption and collection of energy from the ambient air which passes the refrigerant to produce heat, consuming a very small amount of electricity. The principle of operation of the heat pump first appeared mostly in ordinary refrigerators and freezers, air conditioners and then in hot water production devices. Often equated the term heat pump with the air conditioner. Their essential difference is that the pump heats or cools the water and transports it to the network while the air conditioner cools or heats the air directly. The efficiency COP of heat pumps depending on the model is on average over 4. This means that for every 1 kWh of electricity consumed gives us 4 kWh of thermal energy. All the other heating systems have degrees yield below 1 i.e. consume 1 kWh of energy and give e.g. kWh heating energy 0.9.