Commissioning (Cx) is the process of verifying that a building’s systems operate as intended. This includes ensuring the final design and functionality match the owner’s requirements. Commissioned systems might include the following:

  • HVAC

  • lighting and daylighting

  • domestic hot water

  • renewable energy

  • building envelope (BECx)

It can be done on new buildings or on existing buildings, in a process sometimes called retrocommissioning.

Commissioning is likely to yield 5%–10% improvements in energy efficiency by catching mistakes like missing or incorrectly installed equipment. It also helps avoid:

  • occupant complaints and callbacks

  • indoor air quality and thermal comfort problems

  • premature equipment failure

  • litigation
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