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This guide is mean to be a tool for WAP Practicioners seeking to locate and apply the results of sophisticated outcome evaluations from the ORNL Evaluation of WAP. This report presents findings from an analysis of the energy savings, cost savings, and cost-effectiveness for large multifamily buildings (buildings with 5 or more housing units) treated by U.S. Department of Energy’s (DOE) Weatherization Assistance Program (WAP) during Program Years 2007, 2008, and 2009.