Dealing with Foggy Windows


No matter how cold or hot it gets, how dry or humid it becomes, keeping your car’s temperature comfortable often means having to battle against frustrating foggy windows. In colder climates, staying warm by turning on the heater can cause the interior of your windows to fog up. In our hot and humid Houston area, turning the A/C on can cause the opposite issue, blurring the exterior of your windows.

Foggy windows has a lot to do with the combination of conflicting air temperatures and moisture content. On cold days, any moisture trapped inside your car turns to condensation when it hits air next to the windows are below a certain temperature, called the dew point. This condensation is what makes your car’s windows foggy. On hot and humid days, the opposite happens. When muggy air outside of your car reaches the dew point against your windshield after it’s cooled, it fogs up the exterior.

Dealing With The Cold

When it’s colder outside your car and your windows fog, a quick fix is to lower your car’s internal temperature by turning on the defrost vent with cool air or cracking a window. making the inside of your car cooler with help reduce the fog. Also turn on your car’s rear window defogger to help clear up the back window.

For a more comfortable solution, you can turn on the defroster and blow warm air (not hot air) across the windshield to evaporate accumulating moisture. If your car has a recirculate feature, turn it off. When the recirculate feature is on, the heat or A/C reuses the air inside of the car, instead of continually pulling in outside air. In cold weather, your aim is to draw in the dry air, not recirculate the same humid air around the cabin.

One more thing to remember is to keep your car glass as clean as possible, both inside and out. This way, when your glass fogs up, the problem isn’t just that your windshield is dirty.

Dealing With The Humidity

When our seasons down here in Texas finally get themselves in order, we’re going to be dealing with this problem on most mornings. When the air temperature and moisture level are greater on the outside of your car, moisture is going to condense on the outside of your windows when you turn your A/C on. The real trick in this scenario is to increase the temperature on the inside of the car to accumulate less moisture on the outside.

For just a quick fix, you can use your windshield wipers to help get rid of the condensation until you’ve balanced out the temperature. Another way to fight the fog is to warm up your car, turn down the A/C to the lowest, least cool level to increase the temperature without becoming too uncomfortable. If this isn’t working, just turn off your A/C completely.

Trying to see through fogged-up windows is a driving hazard, but with these tips you can help increase your driving safety no matter the weather. At Finnegan Chevy Buick GMC in Rosenberg, we have all the vehicles with state-of-the-art safety features you could ever want! Come swing on by and check them out for yourself!

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