Windows fog up?

My car fogs up as soon as it gets a little cold outside. I have put r34a in it to make sure it had enough in it. I also installed a new pressure switch (I believe it has one pressure switch for high and low pressure). The problem is better, but is still pretty bad, the windshields doesn't fog up anymore, but the other windows are very hard to see out of. If I crack open both front windows the fog will go away slowly in the front, but the rear is still solid fog. The drain isn't blocked, it will still drain out a lot when I stop. Also, most of the time it will be fine, but if I stop somewhere, even for a few minutes, and I get back in to drive again, it will fog up. The air is thick seems like the air conditioner isn't working, but not all the time does it do this when it fogs up. Do you have any suggestions?