Which of the following is a key requirement for energy efficiency in new buildings?

• A. Use of minimum R-value insulation
• B. High-efficiency water heaters only
• C. Single-pane windows
• D. All electrical sockets must be ground fault circuit interrupters

Answer: (A)

The key requirement for energy efficiency in new buildings focusing on insulation revolves primarily around the use of minimum R-value insulation. R-value measures the insulation's resistance to heat flow; the higher the R-value, the better the insulation's effectiveness. Proper insulation helps maintain indoor temperatures by minimizing heat loss in the winter and reducing heat gain in the summer, leading to lower energy consumption for heating and cooling, which is crucial for energy-efficient building design.

Though high-efficiency water heaters contribute positively to energy efficiency, they are just one component and do not cover the broader building envelope or overall insulation needs. Single-pane windows, in contrast, provide minimal insulation and are generally not recommended by energy codes due to their low efficiency. Ground fault circuit interrupters, while important for safety in specific locations, do not directly pertain to the energy efficiency requirements for the entire building structure. Thus, the emphasis on minimum R-value insulation represents a foundational practice for achieving energy efficiency in new construction.