If the waste heat from the engine is not used for heating the passenger compartment in an e-vehicle, alternative solutions for efficient air conditioning are required. One approach is low-temperature panel heaters that create a comfortable climate for the driver and passengers close to the body. Electrically conductive plastics with PTC effect (PTC = Positive Temperature Coefficient), which can be integrated over a wide area, e.g. in the door, the seat, the roof lining or in the footwell, offer the technical possibilities for this. The PTC effect inherent in the materials leads to a self-regulating reduction of the heating power with increasing temperature. Moreover, the materials are light and easily recyclable.