If you have an older home with double-hung wood windows, you may want to consider replacing them with energy-efficient wood or vinyl windows, which have insulating glass. Even if storm windows have been added to your home over the years, they are not as energy-efficient or attractive as modern replacement windows.

This topic covers information related to the historic treatment of wood windows, that may occur during the life cycle of a structure. Older windows in a historical or architectural structure often have qualities that demand for preservation of such windows rather than replacement. Understanding what factors are involved and how to approach treatment of older, possibly significant windows, can be understood by referring to National Park Service Preservation Brief #09, "The Repair of Historic Wooden Windows." Treatment often includes evaluation, maintenance, stabilization, repair and weatherization.