Air conditioning system for a vehicle

The system has an air duct system (2), with a booster blower (5) provided. The air ducts are arranged in such a manner, that the time spent for air in the air ducts (4) is minimized. Part of the air ducts or all air ducts are provided with an isolation part. Cool air is provided in the air ducts for the isolation part. The air is kept at a moderate temperature with the air ducts isolation part. Before the booster blower a mixing system (7) is intended for the mixture of cold and warm air.