In summer, should you turn on the heater or the air conditioner to remove fog inside the car?

[DiLily]

In summer, turn on the air conditioner to remove fog inside the car. Principle of using cold air to defog: On rainy days, the most common method to deal with fogging on the windshield while driving is to turn on the air conditioner and direct it to blow onto the front windshield. The cold air quickly disperses the fog on the glass, providing a fast and direct effect. This happens because the cold air creates a "cold air film" on the glass surface, preventing carbon dioxide from condensing on the glass, thus achieving the defogging effect. Do not use hot air to defog in winter: Hot air can also remove fog, but if you use hot air to defog the front windshield on a rainy day, it will actually worsen the fogging. Right after turning on the hot air, the front windshield may immediately become like "frosted glass." Therefore, if you are driving and the windows fog up due to rain, you should not use hot air to defog.