Windows should be operable. Keep controls in good working order and open whenever possible. Use shutters, awnings, solar screen or landscape materials to protect your windows from direct summer sun. East and west facing windows are the critical ones to shade. Caulk and weatherstrip windows regularly.
Check windows once a year.
Damaged weatherstripping and caulking should be removed and replaced with durable materials. Use horizontal windows instead of vertical windows. Good window designs start at a minimum of three feet off the floor and end a maximum of six to seven feet from the floor. This design allows people to see out of the window while sitting or standing. Windows should be operable.