New study shows advantages of retrofitting, not replacing, historic windows
Thursday January 31, 2013

A new study conducted by the Preservation Green Lab of the National Trust for Historic Preservation has examined a number of window improvement options, comparing the relative energy, carbon and cost savings, in different climate zones across the country. The results show that a number of the existing retrofit options come very close to the energy performance of high-performance replacement windows, at a fraction of the cost.

Some of the key findings of the study include:

- retrofit measures for historic windows can achieve performance results comparable to new replacement windows

- almost every retrofit option offers a better return on investment than replacement windows

Read the executive summary of the study here, or find the full report here. For more information on window repair and energy efficiency, visit our 'Resources' page.


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