The A/C on when in defrost mode will clear your foggy windows many times as fast. Period! It's for safety reasons. Blowing humid air on a cold windshield will add more condensation. It takes a while for the heat to build to clear frost on the out side but condensation on the inside will begin to clear instantly. Suck it up, a little cold air won't kill you but not being able to see clearly, will.
I also don't buy the argument about extra gas or hourse power loss. If you can't see, you don't need any extra horse power. And how much do you use the defroster in a year? A few hours? I'll personally mail you the extra 12 cents if I can help you be safe and arrive alive.
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