To provide an air conditioning system capable of collecting indoor environmental information to creating proper indoor environment a user requires.SOLUTION: In an air conditioning system, a plurality of air conditioners 2 and a manager 4 are connected through a network 3. The manager comprises: an environment similar group creation unit 4a configured to extract air conditioners whose ambient environments are similar with each other, among the plurality of air conditioners, to create an environment similar group; and a monitoring unit 4b configured to acquire operation information on each air conditioner contained in an environment similar group for each environment similar group, to monitor an operation state of each air conditioner.SELECTED DRAWING: Figure 1
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