Should You Use Cold or Hot Air to Defog the Car Interior?

[Sandra]

In winter, both cold and hot air can be used to defog the car interior. Cold Air Defogging: The fog inside the car is formed when moisture in the car condenses on the relatively colder glass. A common method is to turn on the air conditioner and direct it at the front windshield. The cold air quickly disperses the fog, providing an immediate and direct effect. Hot Air Defogging: Using hot air can dry out the fog, and if the interior is relatively dry, it prevents the windows from fogging up again for a long time. Initially, when using hot air defogging, the fog on the windows may increase. Hot air defogging is slower than cold air, but once the glass temperature rises, continuing to blow hot air will prevent further fogging. Hot air defogging is slower than cold air.