Single Hung, or one sash windows will glide sideways, and tilt for easy access cleaning! These windows allow for maximum ventilation, and are perfect for any space. Single Hung Tilt are designed to fit larger window areas. These windows maintain the water proof channel that drive water outside where it belongs while trapping the warm sun inside. The design allows for maximum air circulation while maintaining thermal efficiency. See our gallery for more photos of beautiful windows. When it comes to perfection the choice manufacturer and retailer for single hung windows is SDO Windows & Doors.