The new metropolitan hospital of Artois (NHMA) will replace the current hospital center of Lens. It is a building intended for the care of the population of the territory of Artois. This new equipment has an environmental and sustainable development ambition. The objectives sought tend towards the efficiency of the building in terms of staff and patient comfort, energy sobriety and control of energy consumption. The use of ground-based geothermal energy is the major element of the energy mix implemented. The proposed energy mix makes it possible to meet these objectives since 82% of the needs will be covered by renewable sources. Thermofrigopomps associated with geothermal energy make it possible to produce 49% of the heating needs (4.2 GWh) and 74% of the cooling needs (5.2 GWh); the waste heat recovered makes it possible to satisfy 42% of the heating needs (3.8GWh). The remaining needs are met by traditional sources: a gas boiler ensuring the production of domestic hot water (0.7GWh), peak consumption (0.3GWh) and emergency; and cold units and direct expansion to ensure peak consumption (1.8 GWh) and rescue. Geothermal energy coupled with waste heat recovery saves 1988 t of CO2 annually. The geothermal energy has been sized on the energy needs of the hospital. The energy mix is exclusively dedicated to the consumption of the hospita center