Any room requires the correct supply of outside air and at the same time the control of the internal thermohygrometric conditions. Through the recovery of energy from the air extracted from the environment, through the use of systems with integrated heat pump technology, an economic way in the installation of energy-efficient power plants is offered, which also ensures the degree of comfort to the occupants, both in summer and winter and without added costs in the management of primary air. For buildings that require air exchange and are not equipped with dedicated air conditioning systems, the installation of these units allows the introduction of primary air at a controlled temperature without disturbing the internal conditions in the occupied spaces. It is therefore not necessary to use additional systems to heat or cool the incoming primary air. Moreover, these units allow to guarantee a support to the air conditioning system in the intermediate seasons by exploiting the free-cooling or free-heating periods. If installed on existing buildings, they guarantee the energy upgrading of the system through the management of the air exchange without additional charges. On new installations, on the other hand, the air exchange is completely carried out allowing to reduce the size of the main air conditioning system. In the intermediate seasons the building will benefit from the free or partial cooling generated by these units, which during the partial load phases allow the main system to operate with higher efficiencies.