| A basic requirement for concentrated and safe driving is the feeling of comfort in the passenger compartment. Especially when it is hot and humid, comfort can be attained only through the use of air conditioning. Of course, open windows, an open sunroof or increased air ventilation can contribute to comfort, but they all have certain disadvantages within the vehicle interior, such as additional noise, draughts, exhaust gases, unfiltered entry of pollen (unpleasant for allergy sufferers). |
| A well regulated air conditioning system in conjunction with a well thought-out heating and ventilation system can create a feeling of well-being and comfort by regulating the interior temperature, humidity and rate of air change, regardless of the external conditions. This must be available whether the vehicle is moving or not. |
| Other important advantages of air conditioning are |
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| The cleansing of the air directed into the passenger compartment. (Dust and pollen, for example, are washed out by the moist fins of the evaporator and carried off with the condensation water.) |
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| Temperatures in a mid-range car (for example, after a short period of driving, ambient temperature 30° C in the shade and the vehicle in direct sunlight). |
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