Defogging with Hot Air or Cold Air in Cars?
1 Answers
Car defogging can be achieved using either cold air or hot air. Fogging occurs due to the significant temperature difference between the inside and outside of the vehicle, and both cold and hot air can effectively remove fog. However, hot air defogging is slower than cold air. The most effective method is using cold air, as it blows dry cold air directly onto the windshield, preventing water vapor from condensing on the glass. Hot air defogging works similarly but should not be used during rainy days as it may initially worsen the fogging. Two methods of defogging: Using cold air: Turn on the air conditioner's cold air, press the A/C button, adjust the vents to blow towards the windshield, set the fan speed to maximum, and switch the air circulation mode to external to allow air exchange between the inside and outside of the car, reducing the temperature difference and preventing fog formation. Using hot air: First, turn on the external circulation and wait a few minutes before switching to internal circulation. In winter, using hot air for defogging is more comfortable and prevents the windshield from fogging up again. Solutions for fogging: Use the air conditioner: While driving, start with cold air. For a thorough solution, use hot air before driving or when parked until the fog completely disappears. Open windows for air circulation: Based on the principle of fogging, you don’t even need the air conditioner. Simply open the side windows slightly to allow air convection inside the car, balancing the temperature inside and outside. Buy specialized anti-fog spray: Spray the liquid on the inside of the windshield and wipe it evenly. There are also anti-fog towels available in the market, both dry and wet, which are more convenient but last less than 24 hours. Dish soap or soapy water: Apply a small amount of dish soap or soapy water to the windshield to achieve an anti-fog effect.
