Quote Originally Posted by David802 View Post
Yes originally I was thinking I could cover the top as well since heat rises and not lose so much heat but I've moved on to other ideas now. Although I did cover three sides with foam board. I had it covered with paper but switched... figure it couldn't hurt.
You could cover about 3/4ths of the screen top. Just make sure you use something that resists water do the material doesn't soak up humidity from the air.