An air-conditioning system includes an air conditioner (11) and an air-conditioning controller (50, 55), wherein the air-conditioning controller has, as a control mode, a first mode in which the air conditioner is preheated or precooled at or after a predetermined first time (te) and before or at a second time (ts) in which the target space is next used, the first mode is a control mode in which the air conditioner is operated and the air conditioner is stopped when the temperature of the target space rises to a preheating temperature (TH) that is higher than a target temperature (TM) of the target space in the second time period (ts), or the temperature of the target space decreases to a precooling temperature (TL) that is lower than the target temperature (TM), the preheating temperature (TH) is set such that the temperature of the target space at a point of time of the second time period (ts) is higher than the target temperature (TM) or the target temperature (TM), and the precooling temperature (TL) is set such that the temperature of the target space at a point of time of the second time period (ts) is lower than the target temperature (TM) or the target temperature (TM).
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