Coming back to the marina Saturday evening about 30 minutes before sunset the outside temp was about 80 degrees and it was very humid. We had several thunderstorms during the day. I had the cockpit and cabin air on and set around 70 degrees. The windshield vents were open and the back curtain was off and open air. All of the sudden the windshield fogged over inside and out and visibility was almost zero through the glass. We tried the washer on the outside, wiping down both the inside and out and nothing seemed to clear the fog and condensation.. I put a fan in the windshield to help and crawled back to our slip very slowly looking through the vents. I noticed about 2 hours later the window was finally clear. Has anyone else had this issue and is there a quick solution? Should i turn off the air before moving in a humid situation? I was almost dead in the water and if i had not been so close i probably would have had to sit out the evening on the hook.