Abstract: An HVAC unit for a motor vehicle is disclosed. The HVAC unit includes a housing, a sensor device through which air is flowable and an air duct arrangement through which air is flowable. The sensor device is attached to the housing and airflow-connected to the air duct arrangement at an interface. The interface is provided by two connecting pieces of the sensor device aligned in a Z-direction and two receptacles of the air duct arrangement corresponding with the two connecting pieces. The two connecting pieces are disposed on the sensor device and the two receptacles of the air duct arrangement are disposed in the housing. The respective connecting piece engages in the respective receptacle at the interface and is airtight-connected to the respective receptacle.