This is the Fastest Way to Defog Your Windshield

This trick will save you time and keep you safer while driving this winter.

defog car windshieldShutterstock

You’ve brushed off the snow and scraped off the frost. Now you’re ready to get on the road. But before you put your vehicle in drive, your windshield fogs up.

Windows can fog any time of the year, whether it’s summer or the middle of winter. But cold temperatures can create the ideal conditions for foggy windshields. You and your passengers warm up the cold air inside the vehicle. And when the warm moisture hits the cold glass, fog and condensation occurs.

While wiping the condensation off the window may seem like the best idea, there’s something else you can do to defog your windshield fast: Turn on your vehicle’s air conditioning!

How to Defog a Windshield With AC

Even if it’s freezing cold outside, turn on the AC and aim the vents up so the airflow hits the windshield. Your car’s air conditioning system also acts as a dehumidifier, so it will quickly remove the moisture inside the vehicle by circulating the air through the cold fins in the evaporator.

If your vehicle doesn’t have air conditioning, or it doesn’t work, turn the blower on high and open your windows a crack to allow moisture to escape.

Next time your windshield fogs up, crank up your car’s AC. Your windows will defog quickly and you’ll be on your way.

Rachel Brougham
Rachel Brougham lived through a major home renovation in 2019, knows the ups and downs of home improvement, and loves sharing tips with readers. A veteran journalist of both print and television, she’s won several awards for her writing and has covered everything from the environment and education to health care, politics and food. She’s written for several publications beyond newspapers including Bob Vila, Taste of Home and Minnesota Parent, and she currently writes a weekly syndicated newspaper column. Her memoir, Widowland, about the sudden loss of her husband, was published in 2022. She specializes in everything from home decor and design to lawn and garden, product reviews and pet care. When she’s not writing, you can usually find her tending to her garden (both vegetables and native plants), playing with her dog, watching sports with her family or getting some exercise. A native of Michigan, she currently lives in Minneapolis. An avid user of Instagram, you can follow her @RachBrougham.