This weekend we installed new screen/window things on the screen porch.
(my new ladder - my overly cautious wife made me buy a new one after I fell off and bent my old one)
The 'windows' are a thin, lightweight vinyl.
For her we have all the windows stacked at the top. Allows a nice breeze.
The windows also come out if we wanted to store them over the summer season.
But we'll leave them -- its nice to sit out in the rain and keep all the furniture dry.