Energy Efficiency

10 to 12 percent of a home’s heat loss is through its windows.

Up to 35 percent can be the result of uninsulated walls.


“Saving Windows, Saving Money: Evaluating the Energy Performance of Window Replacement and Retrofit”—Study by Preservation Green Lab

Preservation Brief 3—Improving Energy Efficiency in Historic Buildings by Jo Ellen Hensley and Antonio Aguilar

Building Information Center: Insulation—National Trust for Historic Preservation

Weatherization Guide for Older & Historic Buildings—National Trust for Historic Preservation

Energy Efficiency Basics—Common Sense Preservation

Energy Advice for Owners of Historic and Older Homes—National Trust for Historic Preservation

The Fifth Fuel—Energy Audits

1 “Weatherization Guide for Older & Historic Buildings.” Sustainable Communities. National Trust for Historic Preservation, 2015. Web.