moisture

I have a 2000 5.9 v8 Durango, was wondering if anybody has had a problem with moisture during the winter months. I've done a water check and found no leak, brought it into the dealers a few times but they couldn't find anything. All they suggested was to turn the A/C on cold to make the inside temp the same as outside before I turn off the engine. It gets to the point where I sometimes have to scrape the ice off the windshield from the inside!!