Increasing requirements are being made for automatic and well regulated air-conditioning in automobiles of all classes. Sensor systems are becoming more complex and the demand for high-quality cost-effective sensors is growing. Motor vehicles have windows on all sides sloping at different angles. So the temperature distribution of their interior compartment is irregular - a major challenge when it comes to creating pleasant ambient conditions. Control of the air-conditioning ought to require only the slightest attention from the driver. Effective air-conditioning helps the driver keep a cool head in the most tricky situations and minimizes the stress on passengers. Longer trips tend to be hard on both drivers and occupants, but a well functioning air-conditioning.