Foggy Windows on Rainy Days: Should You Use Hot or Cold Air Conditioning?

[BlakelyLynn]

When dealing with foggy windows on rainy days, whether to use hot or cold air conditioning depends on the season, with two scenarios: 1. In summer, the air conditioning cooling method can be employed. Utilize the air conditioning's cooling and dehumidifying function to reduce air humidity and eliminate fog. During summer, especially when multiple people enter the car without promptly turning on the air conditioning, the exhaled air has high humidity, quickly causing the windshield to fog up. At this point, you can turn on the air conditioning to blow cold air toward the windshield, using its dehumidifying function to remove the fog. 2. In winter, the air conditioning heating method is suitable. This involves reducing the temperature difference to eliminate fog. In winter, directing warm air onto the glass quickly raises the temperature of the front glass, reducing the temperature difference between the inner and outer surfaces of the window. This can promptly prevent excessive fogging on the windshield. However, the rear and side windows warm up more slowly, so it takes longer to completely remove all the fog.