After running the car's heater to defrost the windows, why would I turn it off again and drive the last mile or two in -10F weather with the windows open before parking the car for the day?
Those of us in the frozen lands know: your breathing humidifies the air, and all that moisture is going to freeze on the inside of the windshields during the long cold day and evening--and it is a royal pain to scrape the inside as well as the outside. Bringing the cold air in from outside pushes out much of the warm moist air and dries out the rest. Less scraping!
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