The system includes a sun sensor which detects on which side the sun is shining into the passenger compartment. This means1 that the temperature can differ between the right and left-hand air vents despite the controls being set for the same temperature on both sides.
Actual temperature
The temperature you select in the passenger compartment corresponds to the physical experience with reference to factors such as ambient temperature, air speed, humidity and solar radiation etc. in and around the car at the time.