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      Original vintage advertising gifted to Marc Bagala from Fred & Ron Kammerer

      STUDIES & RESOURCES ON
      WEATHERSTRIPPING EFFICIENCY

      Saving Windows, Saving Money: Evaluating the Energy Performance of Window Retrofit Vs. Replacement, National Trust for Historic Preservation, 2012:

      KEY FINDINGS:

      1. Retrofit Measures Can Achieve Performance Results Comparable to New Replacement Windows. When the performance for each upgrade option is taken into account, this study shows that there are readily available retrofit measures that can achieve energy savings close to new, high performance replacement windows.
      2. Almost Every Retrofit Option Offers a Better Return on Investment than Replacement Windows. Findings from the cost analysis showed that new, high performance windows are by far the most expensive measure, costing at least double that of common retrofit options when considering materials, installation and general construction commonly required for an existing home. In all climate zones analyzed, cellular shades, interior storm panels and various exterior storm window configurations offer a higher average return on investment compared to new, efficient replacement windows.
      3. The Bottom Line. Retrofitting windows with high performance enhancements can result in substantial energy savings across a variety of climate zones. Selecting options that retain and retrofit existing windows are the most cost effective way to achieve these energy savings and to lower a home’s carbon footprint. Retrofits extend the life of existing windows, avoid production of new materials, reduce waste and preserve a home’s character. READ FULL STUDY

      ENERGY EFFICIENT WINDOW RETROFITS IN HISTORIC FACILITIES

      Kent Hendricks, Department of Construction Management, Kansas Historical Society, 2006

      "Owing to an ever increasing emphasis on reducing energy usage in buildings, the older windows found in historic buildings are often in danger of being replaced during rehabilitation projects. These older windows are replaced with more energy efficient models that often do not match the existing historic appearance. It is well documented that windows are poor insulators causing increased heating or cooling load, depending on the weather conditions, and thus are the usual targets when trying to improve a building's thermal performance. This paper discusses the somewhat dissimilar goals of the federal government's energy management program and its historic preservation policies. The main purpose of the paper is to suggest and recommend alternative methods of improving the energy efficiency of existing historic windows while at the same time maintaining the significance and character of the window units." SEE FULL PAPER/PDF

      Original vintage advertising gifted to Marc Bagala from Fred & Ron Kammerer