Best Windows For 3 Season Porch . The ceiling will be 8', so we are thinking of 5' tall windows, with a 2' knee wall. When considering windows for your porch, selecting the right type is important. 17 Best images about Three Season Porches on Pinterest Covered back from www.pinterest.com We are able to manufacture trapezoid and transom windows. • can take as little as a few days to complete an enclosure of an existing porch. There are typically two panes that can be slid to one side or the other.