VEHICLE AIR CONDITIONING SYSTEM

A vehicle air conditioning system includes: a humidity controlling device having an adsorption portion, heating means, a duct having first and second flow paths; a valve; a blower; and a control unit to control the humidity controlling device, the valve and the blower. A control mode of the control unit includes: an adsorption mode in which the blower is activated and air flows into the first flow path without activating the heating means; and a regeneration mode in which the blower and the heating means are activated and air flows into the second flow path. The control unit executes the regeneration mode when the following conditions (1) and (2) are satisfied: