The air conditioner should make a huge difference because it condenses the moist air leaving nothing to freeze to the window, leave it on hot but turn it on near-full/full, leave it on all the time for a few days of driving to really dry out the inside of your car. If your air conditioner works in the summer it WILL work now, in the very least it should reduce the problem 50% or else something is seriously wrong.
Also, do you have rubber floor mats? If you do take them out and feel underneath ALL of them (When the car is warmed up), it may well be moist. You will have to draw the moisture out, likely if you park outside you will need to put a towel under the floor mats and replace it each day until it no longer gets wet. If you have cloth(?) mats take them inside your house over night and make sure they are totally dry and then do the same as you would with the rubber matts and towels...
Related to that, check along the lower edge of the doors of your car, making sure no large amount of snow/water has been absorbed into the carpet there. Again look at finding a garage and/or using towels over time to draw out the moisture.
Lastly, only if the other couple things never worked, check your trunk, under the tire especially, to make sure it is not damp. Water can get in through various methods and cause high moisture levels that can surprisingly even affect the interior conditions.
Never hurts to take it in but likely they will check/tell you what i just did...
Cheers,
Claeren.
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