To provide an air conditioning control system which automatically controls air conditioning in such a manner that energy conservation is compatible with comfortableness by detecting the presence or absence of humans in each room.

Refrigerant piping 8 is connected between an outdoor heat exchanger 14 and an indoor heat exchanger 11, and the refrigerant is circulated through a compressor 13. The cold or warm air from the indoor heat exchanger 11 is fed into a duct 6 by an indoor blower 12, so that the conditioned air is led into each room under air conditioning 1, and then air conditions the room. A control unit 15 performs an air conditioning operation by following the timing chart of air conditioning, and receives signals from a human being sensor 16 and a temperature sensor 17 to control an outdoor unit 9, an indoor unit 5, and an indoor blow unit 7. If the human being sensor 16 detects the presence of a human being in a room at the time when the air conditioning is set to be off, a changing control is performed to cool or heat as desired to give a moderate temperature, which is comfortable for human beings, taking priority over the conditioning schedule of air conditioning. If the human being sensor 16 detects the absence of the human being at the time when the air conditioning is set to be on, the changing control is performed for a low load operation.