Open Sash specializes in energy efficiency, weatherization, and restoration of old windows. An Open Sash energy retrofit turns beautiful quality-made old windows into ones that are as energy efficient as a modern window-at a price that is lower than replacements. Open Sash has developed a unique system for adding glass to the existing sash that doubles the thermal resistance of the window without changing the look or function.
With the addition of modern integrated weather seals, foam insulated weight cavities, and restoration treatment, your old windows will look great and function as well as a modern window. Our retrofit system can be used on any type of window - from historic to factory modern, single or double hung, casement or fixed.
With the addition of modern integrated weather seals, foam insulated weight cavities, and restoration treatment, your old windows will look great and function as well as a modern window. Our retrofit system can be used on any type of window - from historic to factory modern, single or double hung, casement or fixed.
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To make old windows more energy efficient, Open Sash uses a unique technique of adding glass to old windows. This system has been used in new windows since the early 1960s but has never before been applied to retrofitting old windows. The addition of the glass doubles the thermal value of the window and protects the exterior of the window with additional wood and paint.
Energy retrofit for historic building, now used for office rental. Using our energy panel system allowed the owner to avoid a costly historic review process and save on energy costs. Highly visible historic building. In this photo, taken while renovations still underway, you can see replaced glass and new energy panels, allowing maintenance of original curved top windows.
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