What screen keeps very small bugs out?

We have a large picture window in our kitchen that sweats when it's colder outside than it is inside (which is most of our winter and autumn months). The condensation is so bad that is runs down the window ledge and leaves a puddle on the floor. We placed a towel there - but it froze to the window pane. We also got our small electric heater and aimed it at the window - but this was only a temporary solution. Any solutions??

Anyone have any experience with unfinished fiberglass exterior doors? We live in Central Alabama and our house faces west. We receive direct sunlight in the spring, summer, and fall and typically, direct water from thunderstorms. This home has had 5 front doors in its 25 years of life. We purchased a Therma-Tru fiberglass exterior door unit 18 months ago and installed it. Our painter followed the manufacturers directions to stain the unfinished fiberglass. Now the stain is just peeling off. Company says painter did something wrong and they have no liability. Painter willing to try something else...but what? Wife loved the stained look and wants to keep it. I want something that does not need sanding/restaining every year. Thanks.