Defogging the Windshield: Use Cold Air or Hot Air?

[McAlexis]

Air conditioning hot air or heating. Here is the relevant content introduction: 1. Method: If you want to completely eliminate fog inside the car, you should choose to turn on the air conditioning and select hot air to blow on the windshield. Similarly, first use the external circulation, select the air conditioning hot air and the front windshield outlet, wait for about 5 minutes, then switch to internal circulation or simply turn it off. Of course, if the air conditioning has a heating function, the defogging effect will be faster and better. 2. Principle: Use hot air to dry the water vapor molecules in front of the windshield and circulate them outside the car to prevent them from condensing on the glass and forming water droplets. This method of defogging is relatively slow, but it is the most effective in rainy or snowy weather and the most fundamental solution. When the humidity inside the car decreases and the air becomes dry, it can prevent fog from forming on the windows for a long time. It is also more suitable for cold autumn days, at least making the interior of the car warm and pleasant.