HERS® Standards are maintained on a continuous basis by addenda to the current edition. Compliance is Mandatory on either a January 1 or July 1, with the exception of interim (time critical) addenda which are assigned an “authorized” date when approved by the Standards Management Board. The Board may also authorize voluntary use of normal addenda. See the list of addenda below or the HERS Addenda Summary Table for mandatory and voluntary compliance dates. Addenda are incorporated into the “Continuous Maintenance” edition of the HERS Standards when they become mandatory. Current and former editions can be accessed from the HERS Standards Resources page. RESNET STANDARDS RESNET HERS Energy Standards HERS Standards – applicable to Ratings with Building Permit Dates between January 1, 2026 and June 30, 2026 HERS Standards – applicable to Ratings with Building Permit Dates between July 1, 2025 and December 31, 2025 HERS Standards – applicable to Ratings with Building Permit Dates between January 1, 2025 and June 30, 2025 Mortgage Industry National Home Energy Rating Standards (Adopted January 1st, 2013) ADDENDA MANDATORY TBD HERS Chapter 3, HERS Technical Standards Addendum 103 – AC/HP Modeling Supplement – Amends Standard 301 Addendum 98f – Wall Orientation – Amends Standard 301 Addendum 94 – Ground Source Heat Pumps (GSHP) Shared Pump Power – Amends Standard 301 Addendum 90f – Service Hot Water – Amends Standard 301 Addendum 83f – CMU Insulation Grading and R-values – Amends Standard 301 (Note: Addendum 83i is currently in effect) Addendum 82 – Direct Expansion HP & AC Modeling – Amends Standard 301 Addendum 77 – Heat Pump Water Heaters – Amends Standard 301 HERS ADDENDA AUTHORIZED July 3, 2026 HERS Chapter 9, Quality Assurance Addendum 108i – Corrective Actions for Failed File or Field QA Review ADDENDA MANDATORY JANUARY 1, 2027 HERS Chapter 2, Instruction, Assessment and Certification Addendum 101 – Instructor Professional Development HERS Chapter 3, HERS Technical Standards Addendum 81 – Adoption of ANSI/RESNET/ICC 301-2022 Supplement – Adopts Standard 301 Addenda C and E and makes other changes to Standards 301, 310 and 380 for the HERS Addendum 76 – HERS Update Adoption of ANSI/RESNET/ICC 301-2022 – Adopts Standard 301 and its Addenda A and B HERS Impact Analysis ADDENDA MANDATORY JULY 1, 2026 HERS Chapter 2, Instruction, Assessment and Certification Addendum 88 – Modeling Software Training PDU Clarification Addendum 87 – Raters, RFIs, and Modelers who belong to Multiple QA Providers Addendum 86 – Training Provider and Training Program Oversight Addendum 84 – RFI Certification HERS Chapter 3, HERS Technical Standards Addendum 89f – Handheld Watt Meters (replaced Addendum 89i) ADDENDA MANDATORY FEBRUARY 6, 2026 HERS Chapter 1, Rating Quality Assurance Providers, HERS Chapter 3, HERS Technical Standards, & HERS Chapter 5, Revision of Standards Addendum 91f – HERS Chapters 1, 3 and 5 Updates – (replaced Addendum 91i) HERS ADDENDA AUTHORIZED FEBRUARY 8, 2026 HERS Chapter 9, Quality Assurance Addendum 95i – Qualification Criteria for Remote Field QA Reviews ADDENDA MANDATORY JANUARY 1, 2026 HERS Chapter 1, Rating Quality Assurance Providers Addendum 67 – HERS Chapter 1 Update HERS Chapter 3, HERS Technical Standards Addendum 85 – Temporarily Converted Garages – Amends Standards 301 and 380 HERS Chapter 9, Quality Assurance Addendum 75 – HERS Chapter 9 Update ADDENDA AUTHORIZED DECEMBER 17, 2025 HERS Chapter 3, HERS Technical Standards Addendum 98i – Repeal ANSI/RESNET/ICC 301-2022 Addendum C-2025 Exterior Wall Orientation Reporting ADDENDA AUTHORIZED DECEMBER 12, 2025 HERS Chapter 1, Rating Quality Insurance Providers; HERS Chapter 3, Technical Standards; and HERS Chapter 5, Revision of Standards Addendum 91i – HERS Chapters 1, 3, and 5 Updates ADDENDA MANDATORY JULY 1, 2025 HERS Chapter 6, Sampled Ratings Addendum 46 – HERS Chapter 6 Sampling Update ADDENDA MANDATORY MAY 29, 2025 HERS Chapter 3, HERS Technical Standards Addendum 90i – Service Hot Water ADDENDA AUTHORIZED MARCH 30, 2025 HERS Chapter 3, HERS Technical Standards Addendum 89i – Handheld Watt Meters – Amends Standard 310 ADDENDA MANDATORY JANUARY 1, 2025 HERS Chapter 2, Instruction, Assessment and Certification Addendum 80 – Graded Field Evaluations, Probationary Ratings and Probationary Models HERS Chapter 6, Sampled Ratings Addendum 78f – Sampling (replaced Addendum 78i) ADDENDA AUTHORIZED DECEMBER 20, 2024 HERS Chapter 3, HERS Technical Standards Addendum 83i – CMU Insulation Grading and R-values – Amends Standard 301 ADDENDA AUTHORIZED APRIL 28, 2024 HERS Chapter 6, Sampled Ratings Addendum 78i – Sampling ADDENDA MANDATORY JANUARY 1, 2024 HERS Chapter 2, Instruction, Assessment and Certification Addendum 73f – Remote Proctored Exams (replaced Addendum 73i) HERS Chapter 3, HERS Technical Standards Addendum 79f – Table 5.1.2(1) Informative Note Correction – Amends Standard 301 Addendum 74 – Space Constrained AC or Heat Pump – Amends Standard 301 ADDENDA MANDATORY JULY 1, 2023 HERS Chapter 2, Instruction, Assessment and Certification Addendum 68 – HERS Modeler Professional Development Course Requirements HERS Chapter 9, Quality Assurance Addendum 62f – Provider Disciplinary Actions and Appeals Procedures (replaced Addendum 62i) ADDENDA AUTHORIZED MAY 7, 2023 HERS Chapter 2, Instruction, Assessment and Certification Addendum 73i – Remote Proctored Exams ADDENDA AUTHORIZED FEBRUARY 10, 2023 HERS Chapter 3, HERS Technical Standards Addendum 71f – SEER2 and HSPF2 Conversions (replaced Addendum 71i) ADDENDA MANDATORY JANUARY 1, 2023 HERS Chapter 1, Rating Quality Assurance Providers; HERS Chapter 3, HERS Technical Standards; and HERS Chapter 5, Revision of Standards Addendum 65f – HERS® Ratings for Third Party EEPs, RECs Ownership Status, MF Ratings (replaced Addendum 65i) HERS Chapter 2, Instruction, Assessment and Certification Addendum 69 – Combustion Safety Training for RFI Certifying as HERS® Rater ADDENDA AUTHORIZED DECEMBER 4, 2022 HERS Chapter 3, HERS Technical Standards Addendum 71i – SEER2 and HSPF2 Conversions ADDENDA AUTHORIZED OCTOBER 28, 2022 HERS Chapter 9, Quality Assurance Addendum 62i – Provider Disciplinary Actions and Appeals Procedures ADDENDA MANDATORY OCTOBER 21, 2022 HERS Chapter 3, HERS Technical Standards Addendum 66f – CO2e Index (replaced Addendum 66i) ADDENDA MANDATORY JULY 1, 2022 HERS Chapter 2, Instruction, Assessment and Certification Addendum 63 – Training Period Expiration Addendum 60 – Combustion Safety Field Training HERS Chapter 3, HERS Technical Standards Addendum 64f – Multi-Family Sampling (replaced Addendum 64i) Addendum 61f – Exception for Onsite Leakage Testing During COVID-19 Pandemic (replaced Addendum 61i) HERS Chapter 9, Quality Assurance Addendum 58f – Pre-Drywall Inspection QA (replaced Addendum 58i) Addendum 56 – HERS® Modeler QA Addendum 54 – HVAC System Installation Grading QA ADDENDA AUTHORIZED MARCH 4, 2022 HERS Chapter 3, HERS Technical Standards Addendum 66i – Interim Addendum, CO2 Index (Replaced by Addendum 66f – CO2e Index) ADDENDA AUTHORIZED JANUARY 31, 2022 HERS Chapter 1, Rating Quality Assurance Providers; HERS Chapter 3, HERS Technical Standards; and HERS Chapter 5, Revision of Standards Addendum 65i – Interim Addendum, HERS® Ratings for Third Party EEPs, RECs Ownership Status, MF Ratings ADDENDA AUTHORIZED JANUARY 3, 2022 HERS Chapter 3, HERS Technical Standards Addendum 64i – Interim Addendum, Multi-Family Sampling ADDENDA MANDATORY JANUARY 1, 2022 HERS Chapter 2, Instruction, Assessment and Certification Addendum 59 – Include Modeling Skills in HERS® Rater Capabilities & Recertification Addendum 50 – HERS® Modeler HERS Chapter 3, HERS Technical Standards Addendum 42 – Adoption of Standards ANSI/RESNET/ICC 301-2019 and ANSI/RESNET/ICC 380-2019 Addendum 53f – (final for 53i and 55i) Modifications to ANSI/RESNET/ICC 301-2019 for Consistency of HERS® Index Calculations (replaced Addendum 53i) ADDENDA AUTHORIZED OCTOBER 19, 2021 HERS Chapter 3, HERS Technical Standards Addendum 61i – Interim Addendum, Exception for Onsite Leakage Testing During COVID-19 Pandemic ADDENDA MANDATORY JULY 1, 2021 HERS Chapter 1, Rating Quality Assurance Providers and HERS Chapter 2, Instruction, Assessment and Certification Addendum 52f – Eligibility to Grade HVAC Systems (replaced Addendum 52i) Addendum 45 – HERS Chapters 1 & 2 and Appendix B 2020 Updates HERS Chapter 9, Quality Assurance Addendum 37 – QAD, Rating Quality Assurance Provider and Training Provider Disciplinary Actions ADDENDA AUTHORIZED JUNE 13, 2021 HERS Chapter 9, Quality Assurance Addendum 58i – Interim Addendum, Pre-Drywall Inspection QA ADDENDA AUTHORIZED JANUARY 22, 2021 HERS Chapter 3, HERS Technical Standards Addendum 55i – Interim Addendum, Modifications and Clarifications for Implementation of ANSI/RESNET/ICC 301-2019 ADDENDA MANDATORY JANUARY 1, 2021 HERS Chapter 9, Quality Assurance Addendum 34 – QA Datafile ADDENDA AUTHORIZED OCTOBER 13, 2020 HERS Chapter 3, HERS Technical Standards Addendum 53i – Equipment Efficiency and Sizing, and Clarifications of Standard 301-2019 ADDENDA MANDATORY SEPTEMBER 10, 2020 HERS Chapter 3, HERS Technical Standards Addendum 47f – Test Exception for Ducts in Conditioned Space (replaced Addendum 47i) ADDENDA AUTHORIZED AUGUST 16, 2020 HERS Chapter 2, Instruction, Assessment and Certification Addendum 52i – Eligibility to Grade HVAC Systems ADDENDA MANDATORY JULY 6, 2020 HERS Chapter 3, HERS Technical Standards Addendum 49i – Interim Credits for HVAC Installation Quality Grading (replaced July 21, 2020 by ANSI/RESNET/ICC 301-2019 Addendum B-2020 changes) ADDENDA MANDATORY JULY 1, 2020 HERS Chapter 9, Quality Assurance Addendum 30- Quality Assurance ADDENDA AUTHORIZED JUNE 25, 2020 HERS Chapter 3, HERS Technical Standards Addendum 51i – Internal Gains for Energy Rating Reference Homes (replaced July 21, 2020 by ANSI/RESNET/ICC 301-2019 Addendum B-2020 changes) ADDENDA AUTHORIZED APRIL 20, 2020 HERS Chapter 3, HERS Technical Standards Addendum 48i – COVID-19 Pandemic Exception for Onsite Airtightness Tests ADDENDA MANDATORY APRIL 5, 2020 HERS Chapter 3, HERS Technical Standards Addendum 47i – Test Exception for Ducts in Conditioned Space ADDENDA MANDATORY JANUARY 1, 2020 HERS Chapter 1, Rating Quality Assurance Providers and HERS Chapter 5, Revision of Standards Addendum 43 – Implementation of MINHERS® Standards ADDENDA MANDATORY JULY 1, 2019 HERS Chapter 2, Instruction, Assessment and Certification Addendum 36 – Rater Recertification and HESP Elimination HERS Chapter 3, HERS Technical Standards Addendum 41f- Final Addendum, “Tropical Climate Zone” and “Living Space” Definitions; Time-limited Leakage Testing Exception for Puerto Rico and US Virgin Islands (replaced Addendum 41i) Addendum 39- Non-Measured Ventilation Airflow and Ventilation Fan Wattage Defaults ADDENDA MANDATORY MARCH 21, 2019 HERS Chapter 3, HERS Technical Standards Addendum 41i- Interim Addendum, Time-limited Leakage Testing Exception for Puerto Rico and US Virgin Islands ADDENDA MANDATORY JANUARY 20, 2019 HERS Chapter 9, Quality Assurance Addendum 40f- Final Addendum, Ethics Appeal Panel (replaced Addendum 40i) ADDENDA MANDATORY JANUARY 1, 2019 HERS Chapter 3, HERS Technical Standards Addendum 32f- Final Addendum, MINHERS® Standards Revisions and Amendments (replaced Addendum 32i) HERS Chapter 9, Quality Assurance Addendum 29- Quality Assurance Designee ADDENDA MANDATORY NOVEMBER 11, 2018 HERS Chapter 1, Rating Quality Assurance Providers Addendum 35 Software Accreditation ADDENDA MANDATORY OCTOBER 26, 2018 HERS Chapter 9, Quality Assurance Addendum 40i- Interim Addendum, Ethics Appeal Panel ADDENDA MANDATORY SEPTEMBER 8, 2018 HERS Chapter 9, Quality Assurance Addendum 33 Practical Experience for QAD Certification ADDENDA MANDATORY APRIL 12, 2018 HERS Chapter 2, Instruction, Assessment and Certification Addendum 31f- Final Addendum, HERS Chapter 2 Rescind Rater Simulation Practical Test for Certified Raters (replaced Addendum 31i) ADDENDA MANDATORY FEBRUARY 14, 2018 HERS Chapter 3, HERS Technical Standards Addendum 27- HERS® Scope, Definitions and 4 Story Dwelling Ratings ADDENDA MANDATORY FEBRUARY 5, 2018 HERS Chapter 5, Revision of Standards Addendum 32i- Interim Addendum, HERS Chapter 5 Addendum Effective Dates and Transition Period ADDENDA MANDATORY JANUARY 1, 2018 HERS Chapter 2, Instruction, Assessment and Certification Addendum 26- Chapter 1, 2 & 3 CAS Hazard, Probationary Ratings and Reference Standards HERS Chapter 3, HERS Technical Standards Addendum 20- Adoption of Standard ANSI/RESNET/ICC 380-2016 and Addenda (Adopted Nov 2016 and Mandatory Compliance delayed until Jan 2018.) ADDENDA MANDATORY DECEMBER 11, 2017 HERS Chapter 2, Instruction, Assessment and Certification Addendum 31i- Interim Addendum, HERS Chapter 2 Rescind Rater Simulation Practical Test for Certified Raters ADDENDA MANDATORY JUNE 28, 2017 HERS Chapter 1, Rating Quality Assurance Providers Addendum 28i- Interim Addendum, Appendix B Confirmed Threshold Rating Definition (replaced by ANSI/RESNET/ICC 301-2014 Addendum R-2018) ADDENDA MANDATORY APRIL 28, 2017 HERS Chapter 2, Instruction, Assessment and Certification Addendum 25f- Final Addendum, HERS Chapter 2 Recertification (replaced Addendum 25i) ADDENDA MANDATORY FEBRUARY 16, 2017 HERS Chapter 1, Rating Quality Assurance Providers Addendum 22- HERS Chapter 1 Software Accreditation Addendum 21- HERS Chapter 1 Rating Software Changes (Persistence) HERS Chapter 2, Instruction, Assessment and Certification Addendum 24- HERS Chapter 2 Training and Certification Addendum 23- Chapters 2 & 3 Reference Standards and Scope Addendum 19f- Final Addendum, HERS Chapter 2 Rating Field Inspector Evaluation (replaced Addendum 19i) ADDENDA MANDATORY FEBRUARY 7, 2017 HERS Chapter 2, Instruction, Assessment and Certification Addendum 25i- Interim Addendum, HERS Chapter 2 Recertification ADDENDA MANDATORY OCTOBER 25, 2016 HERS Chapter 2, Instruction, Assessment and Certification Addendum 19i- Interim Addendum, MINHERS® Chapter 2-2013 Addendum x-2016 Rating Field Inspector Evaluation ADDENDA MANDATORY OCTOBER 15, 2016 HERS Chapter 9, Quality Assurance Addendum 18f- Final Addendum, Ethics Appeals (replaced Addendum 18i) ADDENDA MANDATORY JULY 28, 2016 HERS Chapter 3, HERS Technical Standards Addendum 17f- Final Addendum, Ratings of Energy Star Certified Multi-Family Dwelling Units in 4 & 5 Story Buildings and Innovative Design Request Definitions (replaced Addendum 17i) ADDENDA MANDATORY JUNE 14, 2016 HERS Chapter 9, Quality Assurance Addendum 18i- Interim Addendum, Ethics Appeals ADDENDA MANDATORY DECEMBER 4, 2015 HERS Chapter 3, HERS Technical Standards Addendum 17i- Interim Addendum, Revision for Ratings of Energy Star Certified Multi-Family Dwelling Units in 4 & 5 Story Buildings and Innovative Design Request Definitions ADDENDA MANDATORY NOVEMBER 14, 2015 HERS Chapter 2, Instruction, Assessment and Certification Addendum 16f- Final Addendum, Revision of Effective Dates for Raters Passing The Rater Simulation Practical Test (replaced Addendum 16i) ADDENDA MANDATORY JULY 1, 2015 HERS Chapter 9, Quality Assurance Addendum 15- Revision of Onsite Quality Assurance Reviews ADDENDA MANDATORY JANUARY 1, 2016 HERS Chapter 2, Instruction, Assessment and Certification Addendum 14- Revision on Assessment and Certification of Rating Field Inspectors (Mandatory for New Candidates July 1, 2015; for Currently Certified RFI- January 1, 2016) ADDENDA MANDATORY JUNE 5, 2015 HERS Chapter 2, Instruction, Assessment and Certification Addendum 16i- Interim Amendment, Revision Of Effective Dates For Raters Passing The Rater Simulation Practical Test ADDENDA MANDATORY DECEMBER 31, 2014 HERS Chapter 2, Instruction, Assessment and Certification Addendum 13- Revision to RESNET CAZ Standards ADDENDA MANDATORY NOVEMBER 29, 2014 HERS Chapter 3, HERS Technical Standards Addendum 7- Revision to RESNET National Rating Technical Standard ADDENDA MANDATORY NOVEMBER 7, 2014 HERS Chapter 9, Quality Assurance Addendum 12- Revision of Petition for Stay of Action and Revision to RESNET to QA Provider Challenge the Findings of a RESNET Quality Assurance Review ADDENDA MANDATORY OCTOBER 24, 2014 HERS Chapter 9, Quality Assurance Addendum 11- Revision to Multifamily Rating Quality Assurance Reviews ADDENDA MANDATORY OCTOBER 17, 2014 HERS Chapter 9, Quality Assurance Addendum 6-Revision to RESNET Quality Assurance Standards ADDENDA MANDATORY SEPTEMBER 28, 2014 HERS Chapter 1, Rating Quality Assurance Providers Addendum 10- Removal of References to Comprehensive Home Energy Raters and Building Performance Auditors ADDENDA MANDATORY SEPTEMBER 18, 2014 HERS Chapter 9, Quality Assurance Addendum 9- Revision to RESNET Energy Smart Education and Qualification Provider Accreditation ADDENDA MANDATORY SEPTEMBER 28, 2013 HERS Chapter 1, Rating Quality Assurance Providers Addendum 5-Revision of RESNET National Building Registry HERS Chapter 9, Quality Assurance Addendum 4-Revision of RESNET Discipline and Appeals Procedures ADDENDA MANDATORY SEPTEMBER 8, 2013 HERS Chapter 1, Rating Quality Assurance Providers Addendum 3-Incorporation of RESNET National Building Registry HERS Chapter 2, Instruction, Assessment and Certification Addendum 1-Revisions to RESNET Training and Certification Standard HERS Chapter 8, Gas Leakage Test Addendum 2- Revision of Gas Leakage Testing Standard
