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I'd rather have the AC system dehumidify outside air, then reheat it before blowing it on the inside of the windshield. Most car HVAC systems make AC and heat mutually exclusive.

Dry hot air to heat the windshield above the dew point avoids the "damned if you do, damned if you don't" choice of cold dry air to keep the inside from fogging up versus hot humid air to keep the outside from fogging up.

It's not a matter of temperature sensing on the windshield, but humidity sensing in the cabin air.




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