Which of the following is a primary reason to compare current test results with the most recent test results?

• A. To satisfy the Authority Having Jurisdiction
• B. To verify that all components are new
• C. To verify changes in the system
• D. To verify energy efficiency

Answer: (C)

Comparing current test results with the most recent results helps you confirm what changed and how the system is performing after alterations. By checking against the last test, you can see whether maintenance, repairs, or modifications have achieved the intended effect and whether the system still meets required performance criteria. It also helps you spot drift or degradation over time and triggers further investigation if the current results differ from the previous baseline.

This isn’t primarily about satisfying an authority, proving all components are new, or assessing energy use. Those may be considerations, but the main purpose of the comparison is to verify changes in the system and ensure continued proper operation.