Method for controlling a hybrid heating and ventilation system of a building, the system comprising a heating and ventilation apparatus having, in the same housing, a heat pump, a heat exchanger cell operating using the countercurrent principle, and at least one heating radiator (7, 8) for the incoming air, further comprising solar collectors, main energy storage and preheating storage units (14, 15), a heat accumulator, and a central control unit for the system, characterized in that solar energy is utilized in four different ways: - once propylene glycol circulating in solar collectors has attained a temperature of +8 °C, its heat is transferred by a heat exchanger of the central control unit into ethylene glycol, which is in turn circulated through the preheating radiator in a duct for the incoming air of the heating and ventilation apparatus thus heating the air introduced from outside; - once the temperature of the propylene glycol from the solar collectors is about +30 °C, propylene glycol is directed by the central control unit to pass through a solar coil in the preheating storage unit to discharge its thermal content, the temperature of said storage unit being maintained by the heating and ventilation apparatus between about +25 and +30 °C; - once the temperature of the propylene glycol from the solar collectors is over +60 °C, propylene glycol is directed by the central control unit through a solar coil in the main storage unit, being further passed via the solar coil of the preheating storage unit to release more heat prior to being recirculated to the solar collectors; - once both storage units (14, 15) have reached the temperature of +80 °C, propylene glycol from the solar cells is directed by the central control unit through its heat exchanger to discharge its heat into an ethylene glycol mixture adjusted to be circulated through a heat accumulator consisting of collector tubes for geothermal energy, and located under the thoroughly isolated basement of a building, with a flow rate twice the flow rate of said propylene glycol, thus preventing boiling, and damage in the solar collectors, while the solar energy is recovered in the heat accumulator, from where said heat is directed during cold winter season to heat the incoming air by circulating propylene glycol through the heat accumulator, and preheating radiator in the heating and ventilating apparatus. - once propylene glycol circulating in solar collectors has attained a temperature of +8 °C, its heat is transferred by a heat exchanger of the central control unit into ethylene glycol, which is in turn circulated through the preheating radiator in a duct for the incoming air of the heating and ventilation apparatus thus heating the air introduced from outside; - once the temperature of the propylene glycol from the solar collectors is about +30 °C, propylene glycol is directed by the central control unit to pass through a solar coil in the preheating storage unit to discharge its thermal content, the temperature of said storage unit being maintained by the heating and ventilation apparatus between about +25 and +30 °C; - once the temperature of the propylene glycol from the solar collectors is over +60 °C, propylene glycol is directed by the central control unit through a solar coil in the main storage unit, being further passed via the solar coil of the preheating storage unit to release more heat prior to being recirculated to the solar collectors; - once both storage units (14, 15) have reached the temperature of +80 °C, propylene glycol from the solar cells is directed by the central control unit through its heat exchanger to discharge its heat into an ethylene glycol mixture adjusted to be circulated through a heat accumulator consisting of collector tubes for geothermal energy, and located under the thoroughly isolated basement of a building, with a flow rate twice the flow rate of said propylene glycol, thus preventing boiling, and damage in the solar collectors, while the solar energy is recovered in the heat accumulator, from where said heat is directed during cold winter season to heat the incoming air by circulating propylene glycol through the heat accumulator, and preheating radiator in the heating and ventilating apparatus.