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The document discusses retro-commissioning (RCx) of existing buildings to optimize building and systems performance. It describes RCx as a systematic process to ensure buildings meet current operational needs. The document outlines the RCx process, including discovery, testing, corrective actions, remedial design, and commissioning. It discusses common systems and issues addressed through RCx. Reasons for RCx include improving energy efficiency, productivity, and occupant comfort while reducing costs. The selection process and responsibilities of owners and consultants are also summarized.








































