Why don't cars blow on face (upper air) AND Defrost at same time?

Question

When I'm in the car, sometimes the windows will get foggy (like when rain) and I want to defrost/defog the windshield but still have the air blow on my face. Why is this not an option on vehicles?? Am I the only person in the world who thinks this would be HANDY!?

Answer 1

Some times cracking both front windows a little will help defrost your windshield.  Then you can leave the ac on u  

Answer 2

The vents under the dash/seats are small compared to the vents that blow on your face. If you used the defrost vents and the dash vents at the same time in some cars.. it wont get enough air to the defrost vents as more air will escape through the larger "face" vents.  

Answer 3

my cars do that... i have two stangs, a freestyle and a civic.

Good luck!