Most states or local jurisdictions have adopted some version of either Standard 90.1 or the IECC as their minimum design standard for all new commercial and high-rise residential buildings. American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings and the International Energy Conservation Code (IECC) are the major energy design standards for new buildings in the United States.