Commissioning
The process of testing a building's systems, such as HVAC, electrical, fire alarm, and plumbing, after installation to confirm they actually work, and work together, the way they were designed to before the owner takes over.
Why it matters
A building can look completely finished and still have systems that don't actually perform right together, an HVAC system that was never tested under real load, for instance. Commissioning is what catches that before the owner is the one discovering it.
On a real project
A commissioning agent runs a new building's HVAC system through a full test cycle, checking that each zone actually reaches its set temperature and that the fire alarm properly shuts down the air handlers during a test alarm.
Who this matters most to
A Quality Control Manager is often closely involved in coordinating commissioning, since it's the last real quality check before an owner takes over. A HVAC Technician usually does the hands-on testing and adjusting during the process itself.
Where this goes wrong
A building passes inspection and opens on schedule, but a step gets skipped to save a few days: the fire alarm system is never actually tested to confirm it shuts down the HVAC system during an alarm. Months later, during a real fire drill, the HVAC keeps running and pushes smoke through the ductwork instead of containing it, turning a documentation shortcut into a life-safety failure.