Xiamen KDSBuilding’s PVC/UPVC double hung and single hung windows combine timeless elegance with modern engineering, offering an outstanding solution for both traditional and contemporary building designs. These windows are crafted from high-quality unplasticized polyvinyl chloride (UPVC), ensuring long-lasting durability, energy efficiency, and minimal maintenance. The manufacturing process begins with precision extrusion of multi-chambered UPVC profiles, designed to enhance thermal insulation and reduce sound transmission. Each profile is internally reinforced with galvanized steel for added rigidity and dimensional stability. Advanced CNC cutting machines shape the profiles to exact specifications, by corner welding or mechanical joining to achieve seamless, airtight frames. Premium EPDM weather seals are installed to provide excellent air and water tightness, and high-performance double or triple glazing is integrated to deliver superior thermal efficiency.

The defining feature of Xiamen KDSBuilding’s double hung windows is that both sashes are operable, allowing them to slide vertically for versatile ventilation—either from the top, bottom, or both. Single hung windows, on the other hand, feature a fixed upper sash while only the lower sash moves, offering a more economical option with a similar classic appearance. Both styles utilize heavy-duty balances and stainless-steel hardware to ensure smooth, effortless operation and secure positioning at any height. Integrated tilt-in or lift-out designs simplify cleaning from inside the building, making them especially practical for upper floors.

These windows are perfect for bedrooms, living rooms, and historic-style homes where balanced sightlines and traditional charm are desired. The multi-chambered UPVC frames dramatically reduce heat loss and help achieve excellent U-values that meet or exceed modern energy codes. Resistant to moisture, UV rays, and corrosion, they are ideal for all climates—including coastal regions. With options for decorative grilles, insect screens, and various laminated finishes, Xiamen KDSBuilding’s double hung and single hung windows seamlessly combine beauty, performance, and long-term value for any architectural project.