I’ll go into a more detailed, scientific explanation in a minute, but the short answer is that to defog the windshield quickly in cold weather, you want to turn on the heat and the air conditioning.
Some cars have a button that does everything for you. My car has a windshield defrost button that does the following:
Turns the blower on full blast and raises the temperature
Turns recirculation off
How to defog your windshield in hot weather
If you're reading this on a sweltering summer day, just turn on your windshield wipers. The fog is on the outside of your windshield, so you can just wipe it away.
Frost, on the other hand, is a layer of ice. You'll see it most commonly on the outside of your car, and it's what you scrape off with an ice scraper. In very cold weather, the fog on the inside of your windshield can freeze, giving you frost on the inside. Treat this the same as fog.
The front defrost button in your car will defrost the windshield by heating it up, and defog it by drying out the air to evaporate the fog. It's both a defogger and a defroster.
The science of defogging
There are two things going on here, in the short term (seconds to minutes) and the long term (the rest of your drive).
This means that in winter, you’ll get condensation from the warm indoor air onto the still-cold windshield. If you can warm up the windshield enough, it will stop being able to pull moisture out of the air.
already there
So why isn’t heat alone enough to do the job? Well, for one thing, sometimes it’s just too cold to keep the windshield warm enough to prevent fogging. But more importantly, you need to defog the windshield, not just prevent future fog. That’s why you turn on the air conditioning.
If you've heard the advice to open your windows, that can help for a similar reason: a blast of cold dry air will help to dry up the fog. But the air conditioning will usually do the same job quicker, without making your entire car cold. So I'd stick with the A/C.
How to prevent foggy car windows
You can also start warming up the windshield before it’s time to drive. If you have a remote starter, great! But even if not, the first step in getting your car ready to drive in the winter should be turning on the car and getting it warmed up. Put the heat on the windshield while you brush and scrape the outside.
And finally, consider cleaning the inside of your windshield, because clean glass doesn’t fog as easily. No, not with your hands or with those fast-food napkins you found under the seat; skin oils and miscellaneous grease and dirt will only make the problem worse. Use a proper glass cleaner like Windex.
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