Strange HVAC behavior

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Any of you guys who live in cold climates that get you drive your SW in the cold even notice the lights on the switches of the HVAC controller blinking in the cold? Yesterday and today we down here in Central FL actually got down to freezing temperatures (well yesterday it was about 38°f for the low but today it was 27° this morning when I walked out to the car) and yesterday and today with the Heat on and the mode control set to Windshield vents (Def.) and Vent set to recirc., the