Aluminum single hung windows and double hung windows are extremely commonly used in the field of home construction, and are highly praised especially in European and American countries. So what are the differences between the two and why are they so popular? 1. What are aluminum single hung windows? Aluminum single hung windows are a type of window constructed using aluminum alloy material. Their defining feature is that only the lower sash can be slid upwards to open, while the upper sash remains stationary and fixed in place. 2. What are aluminum double hung windows? Aluminum double hung windows are a type of aluminum window that feature the upper and lower parts of the window that can be opened inward or outward. 3. Aluminum single hung windows VS aluminum double hung windows From the design structure point of view The characteristic of aluminum single hung windows is that the sash is suspended below within the window frame. Only the lower sash can slide upwards to open, while the upper sash is fixed. This design is simple and practical, suitable for occasions where ventilation requirements are not high or space is limited. In comparison, aluminum double hung windows are more complex and flexible. It......