Greenbelt Homes Energy Retrofit Pilot Project: Final Technical Report
In the fall of 2010, a multiyear pilot energy efficiency retrofit project was undertaken by Greenbelt Homes, Inc, (GHI) a 1,566 home cooperative of circa 1930 and 1940 homes in Greenbelt, Md. GHI established this pilot project to serve as a basis for decision making for the roll-out of a decade-long, community-wide upgrade program to incorporate energy efficiency improvements to the building envelope and equipment with the modernization of other systems such as plumbing, mechanical equipment, and cladding. This report summarizes the Phase 2 (of 3) activities in the pilot program, including crawlspace, attic, and wall upgrades, testing, and energy use summary. In addition to this summary of retrofit upgrades, this report includes an analysis of interior insulation options, which were of interest to some GHI members seeking to maintain the exterior “block” profile of the original buildings. The report also includes an analysis of heating and cooling system options, costs, community impact, as well as a cost-benefit analysis.