I have a single window about 3ft square, in the living room of an old farmhouse. It's a hinged single-glass paned "door" and nearly airtight. I framed out a plexi panel about 6 inches behind it for insulation purposes and that's pretty tight too. Lots of moisture gathers on the inside of the plexi with no moisture on the "interior" paned door. Is there a way to prevent all that moisture inside the "pocket" I created. The only real issue with it is that we frequently can't see through it. Thanks.