Traditional wooden sash windows contribute much to the appearance and elegance of many period homes, especially those dating from the Georgian and Victorian eras. Nevertheless these old units often suffer from many signs of ageing, and cause problems such as draughts, condensation, and rattling on windy days. Owners who wish to have a more modern and energy-efficient window, while retaining the elegant appearance of the originals, can now choose double glazed wooden sash replacements. This article explains why double glazed wooden sash windows can increase the value of your home.