Hello George, glad to hear you enjoy the CQD. Energy conservation falls outside of the purpose of the NEC® established in Section 90.2 as energy conservation is more of a design specification. The energy conservation rules used will depend on the local jurisdiction, as they are all a little different based on geographical needs. The most commonly used are the:International Energy Conservation Code (IECC)
published by the International Code Council (ICC)
and ANSI/ASHRAE 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings,
published by Illuminating Engineering Society (IEC).
Your local AHJ will have more information on which energy code and which edition is used in your area.