There are 2 main benefits of Sash Windows. Firstly they are aesthetically pleasing particularly for older properties. A lot of Georgian and Victorian properties were built with sash windows so keeping with tradition and replacing sash windows with new sash windows is quite important. Secondly the other benefit is better ventilation. Because sliding sash windows can open at the top and bottom at the same time they provide excellent ventilation. Having an aperture at the top and bottom creates a convection flow of air that will cool a room wonderfully in the summer.