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What Causes the Inside of Windshields to Fog Up?

Last updated 6 years ago

Safe drivers form the habit of checking the visibility of their windshield before pulling out of the driveway. From dirt to bugs, a number of factors can contribute to low visibility through your windshield. One extremely common and especially frustrating example is when the inside of your windshield fogs up. If you’ve ever wondered what might be to blame when this happens, read on.

  • Moisture: People often rack their brain thinking of complex solutions to relatively simple problems. The process of deciphering the source of moisture on the inside of a windshield can qualify in many cases. Almost without fail, the air inside of a car will be warmer than the air outside. Because the air inside is humid, it will naturally consist of more moisture. This moisture builds up and ultimately fogs up the inside of your windshield.
  • Dirty Windshield: The cleanliness of your windshield can have a major impact on the amount of moisture trapped inside. When moisture meets a dirty windshield, your humidity problem will only compound itself. Without cleaning your windshield on a regular basis, the moisture already present inside of your vehicle will begin to condense and reduce your visibility by fogging up.
  • Dirty Filters: Cabin filters are designed to ensure that your interior air quality is up to snuff. When your filter becomes filled with dust, your defroster will become far less effective. A less-effective defroster makes for an increasingly humid car. In turn, when your car lacks proper ventilation, you will suffer from both poor air quality and excess fog on the inside of your windshield.

If your windshield is need of repair or replacement, contact the experts at Glass on the Move. With over three decades serving Oakland, Hayward, and Berkeley, and with two consecutive years as Oakland’s auto glass replacement award winner, we are confident we can offer you unparalleled service. To find out more information about our auto glass repair and replacement services, call us today at (510) 338-4791. 


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