To provide an air conditioning system having high energy efficiency and excellent starting characteristics by ensuring rapid recovery of absorption capability of a desiccant.
The present air conditioning system includes a desiccant which absorbs water in air processed in a processing air passage B, and is regenerated by regenerating air in a regenerating air passage B, a vapor compression type first freezing cycle which includes a compressor, a condenser 220, an evaporator 240, and a refrigerant passage, the condenser 220 forming a heat exchange relation with the regenerating air before passage through the desiccant, the evaporator 240 forming a heat exchange relation with the processing air after passage through the desiccant, and a vapor compression type freezing cycle which includes a compressor, a condenser 320, an evaporator 340, and a refrigerant passage, the condenser 320 forming a heat exchange relation with the regenerating air before passage through the desiccant, the evaporator 340 forming a heat exchange relation with the regenerating air after passage through the desiccant wherein heat is recovered from the regenerating air after passage through the desiccant with the freezing cycle to heat the regenerating air before passage through the desiccant.