Frost buildup shows prime cabin humidity; use recirculation off and A/C directly to dry air

https://victor-wiki.win/index.php/Windshield_Calibration_in_Columbia:_Why_ADAS_Recalibration_Matters

Frost buildup indicates excessive cabin humidity; use recirculation off and A/C directly to dry air and clear the windshield faster in wintry weather.