The present invention relates to a vehicle air conditioner for heating, ventilating and / or air conditioning of a vehicle interior space (14), and the vehicle air conditioner (12) discharges exhaust (38) to the surroundings (40) of the vehicle. It has an exhaust duct (36, 72). Furthermore, the present invention includes a method for heating the vehicle interior space (14) by such a vehicle air conditioner (12).
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