Should You Use Hot or Cold Air to Defog in Summer?

[VonReid]

Both warm air and cold air can be used to defog a car. The differences and precautions between using cold air and warm air for defogging are as follows: Differences between the two: Using warm air to blow the windshield is more effective than using cold air because it essentially dries the water vapor, eliminating concerns about fogging up again. However, warm air defogging is slower than cold air defogging, and the fog may initially worsen when first turned on, requiring a few minutes of patience. If you want to quickly remove fog from the windshield, use cold air. Precautions for warm air defogging: In winter, using warm air for defogging is more comfortable. Although warm air takes longer to defog than cold air, it prevents the windshield from fogging up again. When the driver turns on warm air for defogging, the fog on the windshield may initially increase—don’t panic. After a short wait, the warm air will dry the fog.