The project involved the installation of a ground water heat pump system that feeds the circuits of the radiant panels and primary air. The reversible ground water heat pump is able, in winter, to absorb heat from the ground water and, in summer, to release the heat. The summer yield (COP) is 3.5 while the winter yield is 4.5. The COP of heat pumps in fact depends on the temperature difference between the cold and hot source. The summer and winter air conditioning of the building is achieved by means of low temperature radiant ceilings and an air handling unit where the exhaust air extracted from the rooms crosses in countercurrent with that sucked in from the outside in order to recover the heat. in winter and cool in summer. The radiant panel systems of the offices and the warehouse are powered by low temperature water to make the best use of the heat pump and condensing boiler serving the warehouse. The panels used have a vast thermal inertia as they are detached from the structure of the floors, thus allowing the system to be completely switched off at night. In addition, to reduce heat accumulation in the summer season and the need in the winter, panels fed by groundwater were installed between the insulating material of the roof slab and the flooring of the roof itself.