Commissioning Authority (CxA)

The CxA (also called Commissioning Agent or Commissioning Manager) should be independent from the design and construction teams to avoid conflicts of interest. ASHRAE Guideline 0 defines the commissioning process: pre-design (develop OPR — Owner's Project Requirements), design phase (review design for compliance with OPR), construction phase (verify installation, witness functional performance testing), and occupancy phase (seasonal testing, training, warranty review). LEED requires fundamental commissioning as a prerequisite (CxA reviews energy-related systems) and awards up to 6 points for enhanced commissioning (CxA engaged from pre-design, reviews all systems, develops monitoring plan). Key activities: review submittals, develop test procedures, witness functional performance tests (start-up, part-load, full-load, failure mode), verify BMS programming, and issue commissioning report with findings.

Studies show that commissioning identifies an average of 20-30 deficiencies per building that would otherwise go undetected until occupancy complaints or equipment failure. The cost of commissioning (0.4-1% of construction cost) typically pays back within 2-3 years through energy savings and avoided repairs. For LEED projects, commissioning is mandatory.