What is an energy performance assessment and how does it influence design decisions?

• A. It is a financial audit of construction costs.
• B. It evaluates a building's anticipated energy use and guides envelope, systems, and daylighting decisions to meet targets.
• C. It measures only heating load without considering lighting or ventilation.
• D. It predicts structural loads for seismic design.

Answer: (B)

An energy performance assessment estimates how much energy a building will use in operation and uses that insight to steer design choices. It usually models energy needs for heating, cooling, ventilation, lighting, and hot water under the project’s climate and anticipated occupancy, then sets targets to meet or optimize those needs.

Because of that, the assessment informs decisions about the building envelope (insulation, air tightness, window types and placement), the selection and control of systems (efficient HVAC, heat recovery, equipment efficiency, and ventilation strategies), and daylighting and shading approaches (window sizes and locations, skylights, sensors, and controls) to reduce energy use while preserving comfort. Designers compare different options within the model so the final design achieves the desired energy performance and often aligns with certifications or life-cycle cost considerations.

Other options miss the core idea: a financial audit focuses on cost, not energy use; measuring only heating load ignores cooling, lighting, and ventilation; and predicting seismic loads concerns structure, not energy performance.