Double Hung Window Double-hung windows are the most popular replacement window in American homes. This window features two sashes that slide vertically. Double-hung windows difference between single-hung windows is that both sashes can be operated, single-hung windows just open from the bottom sash. Contact Us Today CookCountyWindows@gmail.com(773) 817-3994Monday – Friday: 8 AM – 6 PMSaturday: 10AM – 6PMSunday: Closed