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Variable Refrigerant Flow (VRF) systems allow simultaneous heating and cooling in different building zones by transferring heat from areas requiring cooling to those requiring heating. This results in very high system efficiency, particularly in mixed-use or multi-zone facilities. Constant-volume reheat systems waste energy by reheating cooled air, while rooftop units and PTACs are less efficient and suited to single-zone control. The CEA exam emphasizes VRF as a leading technology for energy-efficient HVAC in modern buildings.

Raising chilled water temperature during low load reduces compressor energy use and improves chiller efficiency. Cooling towers remain necessary, and it does not directly control humidity. CEA auditors recommend reset strategies for central plant optimization.

Measurement and Verification (MandV) ensures that savings from energy efficiency projects are measurable, verifiable, and attributable to the implemented measures. It provides credibility and confidence to clients, financiers, and regulators. MandV does not replace modeling, baseline data, or third-party roles. In the CEA curriculum, familiarity with the International Performance Measurement and Verification Protocol (IPMVP) is critical to designing effective audit and post-audit processes.

The Savings-to-Investment Ratio (SIR) evaluates whether the present value of savings justifies the cost by comparing annualized savings to annualized costs. It is commonly used in public sector and government-funded projects. IRR, BCR, and NPV are related but calculated differently. CEA exams often include SIR because it is integral to evaluating federally funded projects.

Levelized Cost of Energy (LCOE) spreads total costs and total energy output over the project’s lifespan, allowing comparison of projects with different durations. NPV and IRR are valuable but can skew comparisons when project lifespans vary significantly. Payback ignores long-term performance entirely. CEA exams increasingly reference LCOE, especially in renewable and generation projects.