What must all new commercial buildings comply with regarding energy efficiency?

All new commercial buildings are required to comply with the International Energy Conservation Code (IECC) regarding energy efficiency. The IECC establishes minimum regulations for the energy-efficient design and construction of buildings, emphasizing the need for enhanced energy performance. This code addresses aspects such as insulation, glazing, HVAC systems, and overall energy use, and is integral in promoting sustainable building practices and reducing energy consumption.

In contrast, the other codes mentioned do not specifically focus on energy efficiency. The International Fire Code (IFC) pertains to fire safety and prevention measures, while the International Building Code (IBC) addresses general building standards including structural safety and health requirements. The National Electrical Code (NEC) focuses on the safe installation of electrical wiring and equipment. Therefore, the IECC is the appropriate code for ensuring that new commercial buildings meet required energy efficiency standards.