Method device and system for heating/cooling and ventilating a premises

A system for heating/cooling and ventilating a premises comprising a plurality of occupiable rooms and a plurality of functional rooms, the system comprising a heating/cooling and ventilation device comprising a box structure defining an interior chamber, the box structure comprising:

• at least one intake for new ventilation air and one intake for recycled air opening into said interior chamber;
• blowing outlets for blowing out the air contained in the interior chamber, these being intended each to be connected to an occupiable room that is to be supplied with air;
• a plurality of units for thermally treating the air, these each being associated with an air blowing outlet and intended to be controlled independently of one another on the basis of the set-point temperature of the corresponding occupiable room;
• the heating/cooling and ventilation device further comprising a blower designed to allow recycled air to enter the interior chamber via the intake for recycled air,
• wherein the system comprises a central control unit capable of controlling the start-up and rotational speed of the recycling blower on the basis of the difference between the actual temperature and the set-point temperature in at least one occupiable room if the set-point temperature cannot be attained by thermally treating the new ventilation air alone.