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In this project, the post-retrofit results for 13 existing homes from the DER Pilot program were analyzed. Ten of these homes are single-family homes; two are two-family homes, and one is a three-family home. The information available for each home that was used in this analysis included pre- and post-retrofit blower door test results, a project description, reason for doing the project, and project cost information; and actual post-retrofit energy use information provided by the utility companies. The post-retrofit energy use for this project was for the 12-month period from August 2011 through July 2012 and for the 6-month period from January 2012 through July 2012. The post-retrofit performance and cost ranges provided by this research project can provide concrete input for homeowners who are considering a DER.
Building America Case Study: Whole House Solutions for Existing Homes—National Grid Deep Energy Retrofit Pilot: Massachusetts and Rhode Island