-Leave the furnace fan set to "ON" not "Auto"
-Turn humidifier down or off (down if hardwood floors are in the home)
-Leave your blinds up 6 or 8 inches (allows air flow on the glass)
I have newer windows in my house but the house was built in the 60's so it "breathes" very well. Newer homes are constructed so air tight that they depend solely on the HVAC system to overcome these issues.
Bottom line is, if it's minus 30, your probably going to get moisture on your windows, frost on exterior door hinges and peep holes and thresholds too.
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