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well i can say after plugging it in for an hour and running it for 20 minutes the temp gauge was only an 1/8 inch off the left side. It still was blowing cold air. -2f is terrible.
if you have the option to plug it in when its that cold out do it, i just moved and its street parking (Hershey, PA) were getting some negatives here now too and my truck is also wishing it could be plugged in