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From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Why not just run the A/C (A/C= air conditioning, not air cooling) to remove the moisture from the air, summer and winter, or turn the front windshield defroster on if no A/C and adjust the temp accordingly. Crack the window open weather depending. All of this is free and works.
Here in Florida in the summer, it is impossible to keep the windows from fogging up, especially in the afternoons where the humidity is often 95%. I added AC to all of my vintage cars. For those of us that live in the south without AC, Chris's recommendations make driving a little safer. Jerry
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
To be fairer, it doesn't matter how hot, cold or humid it is or where you live. Window fogging can happen. I've owned vehicles back in the day that had no A/C which was common. In the middle of the summer, pouring rain, 100% humidity, I've had to put the heating system in defrost mode and give the heat to the windshield to clear the fog, but it worked.
Yeah, we all carry a potato around in our cars, because everyone knows all you need is some aluminum foil to wrap the spud, then bake it on the engine while driving to the car show. Then sit and eat a baked potato.....