<;P>;PROBLEM TO BE SOLVED: To provide an air conditioning system reducing running cost for adjusting temperature and humidity of a glass house space. <;P>;SOLUTION: This air conditioning system 10 includes an utilization unit 3, a heat source unit 2, an air introducing means D1, a temperature detecting means Se1, a humidity detecting means Se2, and a control section 7. The air introducing means switches a first introduction state of introducing the air exchanging heat by a heat source-side heat exchanger, to an air-conditioned space, and a first non-introducing state not introducing the air exchanging heat by the heat source-side heat exchanger to the air-conditioned space. The temperature detecting means detects the temperature in the air-conditioned space as a space temperature. The humidity detecting means detects the humidity in the air-conditioned space as a space humidity. The control section performs temperature/humidity control for controlling the utilization unit, the heat source unit and the air introducing means on the basis of the space temperature, the space humidity, a target temperature and a target humidity. <;P>;COPYRIGHT: (C)2010,JPO&INPIT