Why Does Turning on Defogging Actually Increase Fogging?

[DeBryce]

It might be because the air conditioning is set to recirculate. When there are people breathing inside the car, the humidity increases, and if the outside temperature is low, the warm, moist air can condense on the cold glass, causing fogging. Switching the heating to fresh air mode can help avoid this issue. More related information is as follows: 1. Fresh Air Mode: To defog, use fresh air mode, which involves heating or cooling the air from outside the car before bringing it inside, thus exchanging air between the inside and outside of the vehicle. Recirculation mode means the air inside the car is heated or cooled and then circulated back inside. 2. Car Air Conditioning: Car air conditioning typically includes cooling, heating, and ventilation systems. This integrated setup makes efficient use of the limited space inside the car, featuring a simple structure and easy operation, making it the internationally popular modern car air conditioning system. Car air conditioning can cool, heat, ventilate, and purify the air inside the cabin, providing passengers with a comfortable environment, reducing driver fatigue, and improving driving safety.