Among renewable energies, geothermal energy is gaining importance due to the different applications that are being accomplished within the residential sector. Forecasts suggest a “promising future” for this energy source.A study carried out by the Department of Energy at University of Oviedo, approached from technical, economic and environmental views related to this source gave as a result the geothermal installation designed for covering the demand of heating and hot water production (DHW) of a detached house located in Asturias described in this paper. Its aim it’s to make an optimal use of geothermal energy, combining a geothermal heat pump with a radiant floor heating system in order to keep the building in comfortable conditions and minimizing the effect of the outside temperature.