I understand you need the vents but just wanted to say for others that the A/C will strip the moisture out of the air, so running the A/C up through the vents should not cause condensation on the inside of your windows.
Now if you know different, then I am wrong.....lol.
In your modern day cars, as soon as you hit defrost, you will hear your A/C compressor kick in.
They go hand in hand now to prevent moisture being blown across your windshield.
Trev