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Existing Building Commissioning Case Study Series

Existing building commissioning (EBCx) is a key process that can help existing commercial, institutional and multi-unit residential buildings (MURBs) operate as intended and meet current facility requirements. EBCx focuses on improving or optimizing (i.e., “tuning up”) the performance of existing equipment and systems and identifying low-cost or no-cost operational improvements. It can provide benefits to building managers and operators such as improved building performance, energy savings, and operator skills development. EBCx is a general term that includes recommissioning, retro-commissioning and ongoing commissioning.

The Office of Energy Efficiency has compiled this library of case studies to illustrate how EBCx projects are initiated, conducted and managed. These case studies also highlight examples of energy savings, occupant-comfort improvements and valuable lessons learned that have resulted from investing in these projects.

Below, you will find links to EBCx case studies for projects that cover an initial range of building types, geographic locations, and climate zones, as well as different approaches to EBCx. Over time, NRCan intends to continue to obtain and post further case studies, so we invite you to return to this page from time to time and review new studies as they are published. If you have an EBCx case study from your own organization that you would like to see posted here, please contact


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