Should You Use Hot or Cold Air to Defog Windows?

[McEverly]

To defog windows, use hot air. The methods for defogging are: 1. When there is slight fog, open the windows to balance the temperature inside and outside the vehicle; 2. Turn on the car's air conditioning in cooling mode; 3. Activate the heating system before driving; 4. Use the car's defogging function; 5. Apply a mixture of dish soap and water or soapy water as an anti-fog agent on the windows, or place a dehumidifying box (like those used in wardrobes) inside the car. Fogging occurs due to the temperature difference between the inside and outside of the vehicle. Since the interior temperature is relatively higher, when the warm air inside meets the cold glass, the moisture in the air condenses, forming a layer of mist on the windows. This significantly obstructs the driver's view, making the road ahead appear blurry. Effective defogging methods ensure efficient and safe driving.