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Air conditioning (AC) system is a nonlinear, asynchronous and uncertain natured system. In this paper a fuzzy discrete event systems (FDES) is introduced in the research of air conditioning control. A fuzzy automaton for air conditioning system is given. A modeling method is proposed and a control model has been set up for the air conditioning system. Cost optimization is based on set up priorities in events combination and effectiveness function optimization is based on forward-looking tree. The simulation results show that the optimal control can be better resolved with FDES in air conditioning system. Practically application of this method is observed reduce in energy consumption of the system.