Originally Posted by firebane
Then you circulate cold air :P If you notice in the cooler climates people have a tendency to use this mode and you end up with foggy windows. The best way is to pull the air from outside and set your temp just to the warm souch and then point it to the floors and vents and your car should almost never fog up.
Wrong. If its cold outside and you put on the heat with recirc, it will get warmer faster. It still goes through the heater core. Since the air is warmer than it is outside, it will get warmer faster. Like with the AC. It will get cold faster if you have it on recirc.