Hi Kythe. I have the same problem. Except for in the dead of winter, I have to have cool air blowing out of the vents.
When it is really cold and frosty, I will put warm air on my feet and on the windshield, but I will crack my window just a bit. This seems to help clear the warm air from around my face, while still keeping my feet warm and defrosting the windshield.
Hope you find a solution that works for you.
"There is no charm equal to tenderness of heart." - Jane Austen
Fibromyalgia, 2 back surgeries, Meniere's Disease, 30+ kidney stones, GERD, IBS, Asthma, Allergies, Endometriosis, Heart Arrythmia, Myofascial Pain, TMJ.