关键词：节能；建筑；成本效益分析；改造
摘 要：The purpose of this project was to follow up on a Building America (BA) retrofit project to determine the actual savings. In addition, this project provided a perfect opportunity to look at the use of the Building Energy Optimization Program (BEopt) as it applies to multifamily retrofits. BEopt is a tool that is used by the BA Program to determine cost optimized packages in both new and retrofit construction. It also provides a consistent way to compare one BA project from another in various climate regions. BEopt was not originally built for multifamily, nor for retrofit projects. However, when Vice President Biden announced Recovery through Retrofit in 2009, BA took on the challenge of existing homes. BEopt was one component of the BA Program that added retrofits into its repertoire and has been continually improved since then.