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Persistence of Savings from Retro-Commissioning Measures

Many programs and initiatives improve building controls to save energy. How long do those improvements last? Slipstream explored the persistence issue in one of the most comprehensive field assessment studies ever conducted in the U.S.

Retro-commissioning (RCx), a systematic process to improve an existing building’s performance, aims to capture lost savings from inefficient building management practices. However, the measure life of many implemented RCx measures is based on assumptions and limited literature and varies widely across studies. To understand how energy savings persist over time after an RCx effort, the Slipstream research team conducted a study of past RCx participants across many years of the ComEd RCx energy efficiency program. We investigated realistic measure life assessments, both at the building level and at individual measure level.

Read all about our methodology, results, observations and program recommendations in this final report.