Airconditioning device, in particular for a motor vehicle

The air conditioning system (1), especially for a motor vehicle, has an air duct system (2) with a number of air ducts (4). The air ducts are insulating in their construction or are provided with insulation. The air ducts are constructed in such a way that the dwell time of the air in the air ducts is minimized. The air conditioning system is provided with at least one booster fan (5).