New Mandatory Compliance Date for Implementation of RESNET/ANSI Standard 301-2019 RESNET staff is receiving information that HERS scores are changing more than expected with the transition to ANSI RESNET/ICC Standard 301-2019. The new mandatory compliance date for using Standard 301-2019 is now January 1, 2022. This will allow a transition period for HERS raters and builders of single-family and low-rise multi-family dwellings to evaluate the impact of Standard 301-2019 changes on their products’ ratings and to make any necessary adjustments to their designs. This does not mean you cannot use Standard 301-2019 now for ratings. Builders and raters can use Standard 301-2019 now which includes high-rise multifamily dwellings and standard 310 for evaluating HVAC systems. To address this issue for the future, RESNET Staff will develop a proposed standard amendment for a software approval process that includes evaluation of the impact of standards changes on rating scores and Transition Periods sufficient for Raters and builders to adapt to changes. Conceptually, implementation of major updates to the technical standards will include: • Staff review of potential changes to scores as part of the rating software accreditation process An industry review period after the new version of the rating software program for the rating industry to evaluate how ratings will change and to educate their clients • A Voluntary Compliance Date that will allow HERS raters and builders to voluntarily use the new rating software version • A Mandatory Compliance Date that will allow dwellings to be completed according to the specifications agreed upon at the time the contract for construction is enacted or where applicable an affordable housing subsidy application is submitted.In addition RESNET Staff will also be undertaking an education program to code jurisdictions and program sponsors to cite on which standard version they are basing their code compliance and program qualifications.