To provide an air conditioning system capable of sufficiently reducing not only energy consumption but also calculation load of an air-conditioning management device.

In this air conditioning system 1, a normally-thermo-off state determining portion 22 determines whether each of a plurality of indoor machines 62 is in a normally-thermo-off state or not in a first period first. Then, a normally-thermo-off state indoor machine number counting portion 22 counts the number of normally-thermo-off state indoor machines. Subsequently, an excess number determining portion determines whether the number of thermally thermo-off state indoor machines is more than a prescribed threshold value or not. A control portion 21 stops the normally-thermo-off state indoor machines excluding at least one normally-thermo-off state indoor machine, when it is determined that the number of the normally-thermo-off indoor machines is more than the prescribed threshold value by the excess number determining portion.