An air conditioning system in which one outdoor unit and at least one indoor unit (3a, 3b) are connected to each other by a common refrigerant pipe, the air conditioning system comprising: a sensor configured to detect information relating to a state of a device, a state of a functional component, or a state of a refrigerant, the device, the functional component, and the refrigerant being provided in the outdoor unit or the indoor unit (3a, 3b); an active-type short-distance wireless device (5a-5g) that is connected to the sensor, is configured to receive sensor information from the connected sensor, and is configured to transmit the sensor information or information relating to the sensor information; and an information processing unit that is provided so as to be capable of communicating with the short-distance wireless device (5a-5g) and that is configured to receive the sensor information or the information relating to the sensor information from the short-distance wireless device (5a-5g), wherein the information processing unit is provided with a determination unit that is configured to, on the basis of the sensor information or the information relating to the sensor information, determine whether or not the device or the functional component that affects the sensor itself or the sensor information is a genuine product, characterized in that the determination unit is configured to compare sensor information before and after component replacement during a stable operation in which a rotational speed of a compressor is maintained at a fixed value in a case where replacement of the device, the functional component, or the sensor is performed, and to determine that the replaced device, the replaced functional component, or the replaced sensor is not a genuine product when a variation equal to or more than a variation in components characteristics of genuine products appears in a result of the comparison. a sensor configured to detect information relating to a state of a device, a state of a functional component, or a state of a refrigerant, the device, the functional component, and the refrigerant being provided in the outdoor unit or the indoor unit (3a, 3b); an active-type short-distance wireless device (5a-5g) that is connected to the sensor, is configured to receive sensor information from the connected sensor, and is configured to transmit the sensor information or information relating to the sensor information; and an information processing unit that is provided so as to be capable of communicating with the short-distance wireless device (5a-5g) and that is configured to receive the sensor information or the information relating to the sensor information from the short-distance wireless device (5a-5g), wherein the information processing unit is provided with a determination unit that is configured to, on the basis of the sensor information or the information relating to the sensor information, determine whether or not the device or the functional component that affects the sensor itself or the sensor information is a genuine product, characterized in that the determination unit is configured to compare sensor information before and after component replacement during a stable operation in which a rotational speed of a compressor is maintained at a fixed value in a case where replacement of the device, the functional component, or the sensor is performed, and to determine that the replaced device, the replaced functional component, or the replaced sensor is not a genuine product when a variation equal to or more than a variation in components characteristics of genuine products appears in a result of the comparison.