The purpose of re-commissioning is to diagnose what?

• A. It increases overall cost savings
• B. Update documentation
• C. A replacement of all HVAC units
• D. The cause of ongoing, unresolved problems

Answer: (D)

Re-commissioning is about finding why a building’s systems aren’t performing as intended after the initial commissioning. It focuses on diagnosing the sources of ongoing, unresolved problems—identifying faults, mismatches, or inefficiencies in control sequences, sensors, actuators, equipment interactions, or setpoints—and then verifying that corrective actions bring the system back to its designed performance. This process often involves testing, data collection, and targeted adjustments to pinpoint root causes rather than simply making broad changes. While uncovering issues can reveal opportunities for cost savings or require updates to documentation, the primary goal of re-commissioning is to diagnose and address the underlying reasons the system still isn’t delivering the expected results. Replacing all HVAC units is not the intent; such a drastic step would indicate fundamental design or feasibility issues, which is not what re-commissioning aims to accomplish.