The complex “Le Residenze” is a new building designed with high quality standards, located in the historic center of Busto Arsizio. The building is rated “A” in Energy Performance Certificate, due to the innovative design, which special attention to the thermal insulation and advanced technology systems. Four centralized heating systems have been designed, in order to make independent the 4 stairwells of the building. Four Baxi modular condensing generators (GMC) have been installed combined with a solar system for the centralized DHW production and ari/water heat pump. This system permits to optimize the annual generation performances, using the heat pump both for cooling and heating, in this case, it works only this outdoor temperatures higher than 6°C, with working conditions which allow a high COP. The boilers in cascade work when the outside temperature is below 6°C, when the efficiency of the heat pump decreases also due to the frequent defrosting cycles. The choice of which heat generator was to work is automatically done by means of electric diverter valves, while the integration to the solar system to DHW production is always effected by the condensing boilers. The GMC outdoor installations allow to exploit the whole surface of the building. Inside the accommodations, Luna SAT RH (hydraulic connections G3/4’’) or RHG1 (hydraulic connections G1’’) have been mounted, according to the heating/cooling requirements of the flat. The consumption are recorded by a M-BUS transmission network to which are connected the eat recorder and the cold/hot water flow meters. The flats are supplied with underfloor heating systems, while fan coils are installed in false ceiling for summer cooling. Diverter valves change from summer to winter mode. In commercial premises, wall mounted fan coils serves both for heating and cooling.