Updates in the latest ASHRAE Standard 90.1 and the 2021 International Energy Conservation Code (IECC) will make their way into state and local codes over the next couple of years now that the U.S. Department of Energy (DOE) has issued formal determinations about the projected energy efficiency gains for both measures.
Revisions in both of those documents will have at least some impact on HVAC contractors working in commercial and residential sectors, respectively.