Single Hung Window Single-Hung Windows allow ventilation through a single operable lower sash, making them ideal for patios or walkways. The single hung window often referred to as a sash window, is easy to slide up and a standard replacement choice for modern home construction. Contact Us Today CookCountyWindows@gmail.com(773) 817-3994Monday – Friday: 8 AM – 6 PMSaturday: 10AM – 6PMSunday: Closed