How to Stop Car Windows from Fogging Up

Foggy windows

Not only does the window get foggy in cold winters, but it also gets cloudy in warm weather, depending on the circumstances. Mostly, these two factors cause fogging: moisture and the temperature of the air. When cold air outside the car meets warm and moist air inside, the window pane cools down and the glasses get frosted. In this case, the water droplets will form inside the window.

The same thing happens in warm weather: when cooled air from the air conditioner meets warm air from outside, condensation occurs, and the window gets fogged up. Unlike the former case, the water droplets will be formed outside of the window. 




Removing fogged car windows is important because it ensures clear visibility, which is crucial for safe driving by allowing you to see the road and other vehicles clearly. Additionally, it prevents accidents and enhances overall driving safety.



what is condensation?

What is condensation?

Condensation is a scientific phenomenon in which water and moisture in the air turn to liquid due to cooling. When it is warm, liquid water evaporates, and air gains water molecules (water vapors). When it gets cold, air loses water molecules when the temperature drops, so the water droplets condense.



how to defog and prevent foggy windows

How to Defog and Prevent Foggy Windows

There are several ways to prevent fogging. As it mostly happens due to the difference in exterior and interior air temperatures, you can open your car’s window and let the air get mixed up so the temperatures get similar to each other. But this method can be unpleasant for the passengers inside; let’s search for other ways other than making the car too cold or too warm.


  • Turn on the air circulator in your vehicle :

    The best method for sudden fogginess is to press the air circulator button, which will make the window clear by exposing it to warm or cold air rapidly. The system intakes air from outside the vehicle, thus making the temperature of the air inside and outside the same.

  • Apply anti-fogging spray :

    Another simple way of defogging your windshield. It contains water-resilient ingredients that make the water vapors stick to your glasses. Remember that on cold days, you should apply it inside the window, and on warm days, vice versa.

  • Keep your window panes clear and shiny :

    Water vapor sticks to surfaces while condensation forms, and it tends to adhere more to places with uneven surfaces. Plus, when the window panes are dirty, the windscreen wipers will work poorly, and fogging will not come off your window.

  • Don’t smoke inside your car :

    The mechanism goes along with the first rule: the nicotine and tar molecules will cover your windows and make water vapor easier to stick to.

  • Put your air conditioner and heater at the same time :
    air conditioner
    It might sound a little odd, but there’s a reason. The warm air tends to contain more moisture. However when the air conditioner is turned on, the coolness will blow off the water vapors, and little of it will be left. A lower moisture level would be less likely to cause windshield fog.

  • Open the windows slightly :

    It helps to exchange hot air for cold air by cracking open the side glasses. Both in the winter and summer, this instantly clears any fogging.