The popularity of our traditional Double Hung endures, thanks to a thoughtful incorporation of classic details and Marvin ingenuity. Our spring-balanced hardware offers smooth opening and closing. Sash easily tilt into the room for cleaning. And forget propping up your window with whatever's handy -- an open sash stays open, until you secure it closed with our spring return lock. Marvin builds double hungs precisely to order, so they work perfectly in remodeling and restoration as well as new construction.