RESNET standard development procedures require that Addenda to the RESNET HERS standards are to be implemented on January 1 and July 1 of each year. The two addenda below are currently voluntary and have a Mandatory Compliance Date (MCD) of July 1, 2025. • SDC 300: Addendum 76 – HERS Update Adoption of ANSI/RESNET/ICC 301-2022 – Mandatory July 1, 2025 • SDC 300: Addendum 81 – Adoption of ANSI/RESNET/ICC 301-2022 Supplement – Mandatory July 1, 2025 Visit https://www.resnet.us/about/standards/ for information on current standards as well as those out for public comment, and historic standard information.
