AIR CONDITIONING DEVICE FOR VEHICLE AND AIR CONDITIONING CONTROL METHOD FOR VEHICLE

An air conditioning device for vehicle includes a refrigeration cycle including a compressor for sucking, compressing and discharging a refrigerant, a condenser for condensing the high-temperature and high-pressure refrigerant discharged from the compressor, an expansion valve for decompressing the refrigerant condensed in the condenser and an evaporator for evaporating the refrigerant through heat exchange between the refrigerant reduced in pressure by the expansion valve and surrounding air. This air conditioning device for vehicle increases an operation rate of the compressor more than that before a vehicle speed drops below a first permitted vehicle speed higher than a fuel cut recovery vehicle speed when an air conditioner is on, at which the compressor is actuated, when the vehicle speed drops below the first permitted vehicle speed during the deceleration of a vehicle associated with a fuel cut.