Originally Posted By: MarkStock
Mercedes recirculation is designed to let in a little outside air to prevent fogging up.
It's something that Lexus copied.
Dual pane, argon filled gas windows, with coolant circulation around the windshield, and automatic thermostat controlled heating of the outside review mirrors. Plus cabin air exchange and filtration management regardless of climate control settings.
Upgrade to Guard and you can get positive cabin air pressure with filtration and protection against high level radiation, gas, and bio threats...
A bit of engineering and money can fix any problem, their is a reason 97% of the worlds leaders roll S class...
But on normal cars a heated garage, or turning the defrost on works wonders. If you drive a beater where it doesn't work...well I used to carry a rag.