I had a screened porch on the lake house for years when I was married....loved it and used it a lot to sit and read or sew. Couldn't leave sewing stuff out there because of pollen during that season, and didn't during rain because of moisture on my 1940's machine but I had a project going out there a lot. There seemed to usually be a breeze and the light was pretty good most of the day. If I were to put a screened porch on my current deck---and we've talked about it---I'd probably have 3-4 feet of drywall or paneling at the bottom and the rest screen. I'd do this so I could have electrical outlets and some low bookcases and the like out there.....the lake porch had no electrical outlets so I had to sew using an outdoor extension cord that people tripped over a lot. Good Luck!