<p>There is provided an air-conditioning system in which at least one or some of a plurality of air-conditioning apparatuses are each controllable such that the indoor temperature is maintained between two set temperatures. All the plurality of air-conditioning apparatuses are switched to either one of heating operation and cooling operation on the basis of a temperature difference between the indoor temperature related to an air-conditioning apparatus that is in the first operation mode and a set target temperature and a temperature difference between the indoor temperature related to an air-conditioning apparatuses that is in the second operation mode and an upper temperature limit or a lower temperature limit.</p>
