A few meters beneath the Earth’s surface the soil maintains a relatively constant temperature throughout the year, approximately 7°C in northern latitudes and 21°C in southern latitudes. Geoexchange technology uses this constant temperature for providing buildings with an extremely efficient source of heat (during winter) and cool (during summer). During the winter, water which circulates through pipes buried in the soil absorbs the earth’s heat and brings it inside the premises. The geoexchange system uses for warming up a building a heat pump for concentrating Earth’s thermal energy and transferring it in the premises by way of a standard network of pipes. During summer, the process is reversed: the warm air is concentrated and transferred by the heat pump to the pipe network beneath the building and further down in the soil. The only external energy required for the functioning of the system (running the ventilator and the water circulation pump for the underground pipe network) is a small source of electricity.