Remember your air conditioning system does not only cool your vehicle. Another of its primary functions is to remove the humidity from the cabin. So it is good practice to use your air conditioner in winter to keep your windscreen free of fog which impairs your visibility.
The air conditioning process explained.
Wet your finger and wave it in the air. What you are feeling is a refrigeration effect. When a liquid turns to a vapour it absorbs heat. In this case, it is sucking the heat out of your finger. The opposite is also true. If that vapour then loses that heat, it will turn back into a liquid.






