I have a block heater and into that i have spliced a car heater on a timer. I plug it in when I get home and it goes on a couple hours before I got to work. My car is nice and toasty warm on the inside when I get in and I don't have to scrape the windshield most days unless it snows a ton or is really cold out. I usually plug it in when it gets cold enough to that I have to scrape. I've had people comment "why are you plugging your block heater in now?" Well, i'm the one with the toasty car and their the one scraping the windshield. I guess a car started would do the same thing, but I digress.
So my block heater is running once it hits 0.
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