PUBLIC COMMENT: PDS-01 BSR/RESNET/ICC 301-2022 Addendum B-202x, CO2 Index Proposed Standard BSR/RESNET/ICC 301-2022 Addendum B-202x amends the 2022 edition of Standard 301 to modify the criteria for calculation of the CO2 Index. The CO2 Index was established by standard ANSI/RESNET/ICC 301-2019 Addendum D which was then incorporated into Standard 301-2022 with other Standard 301-2019 addenda. New versions of the databases referenced by Standard 301-2019 Addendum D were released after it was approved so the Index calculation sections are being revised by BSR/RESNET/ICC 301-2022 Addendum B-202x to update the references and clarify their use. (Note: Standard 301-2019 recently became the basis for calculating RESNET HERS® Index ratings so Standard 301-2022 will not become the basis for the HERS® in the near term. MINHERS® Addendum 66 adopted the CO2 Index calculation and reporting criteria currently in effect for the HERS® including the updated referenced databases and the Index will be calculated and reported with the HERS® ratings when rating software is updated. Standard 301-2022 Addendum B is intended to ensure that the criteria for the CO2 Index calculation are consistent with the criteria adopted by the MINHERS® Addendum 66 when the transition to the Standard 301-2022 based HERS® occurs in the future. Also note, the CO2 Index calculation utilizes data currently collected by raters and does not require additional data collection.) The draft addendum, comment form, and comments received are posted at Draft PDS-01, BSR/RESNET/ICC 301-2022 Addendum B-202x, CO2 Index. Public comments will be accepted from June 3, 2022, through July 3, 2022.