What is the heart of the commissioning process?

• A. Functional performance testing
• B. Design development
• C. Financial auditing
• D. Energy modeling

Answer: (A)

Verifying that installed systems perform as intended through functional performance testing is the heart of the commissioning process. This stage proves that equipment, controls, sequencing, and interlocks operate correctly under real operating conditions and meet the owner’s project requirements and performance criteria for comfort, safety, and energy use. It relies on documented test procedures, defined pass/fail criteria, and logs of issues with retesting to ensure problems are resolved and performance is verified. While design development defines what should be built and energy modeling helps set targets, they are planning tools and do not confirm actual field performance. Financial auditing lies outside the scope of commissioning.