This document incorporates all amendments to the chapters of the RESNET HERS Standards adopted as of July 1, 2026. The first page of each Chapter denotes whether there are addenda to the Standards with delayed implementation dates that revise requirements in the Chapter. Chapter 3 establishes the standards for HERS Index ratings and CO2e Index ratings and provides two options. The mandatory minimum standards are based on ANSI/RESNET/ICC 301-2019, ANSI/RESNET/ICC 380-2019 and ANSI/RESNET/ACCA/ICC 310-2020 together with their respective HERS Standards addenda that modify the RESNET ANSI standards. The voluntary alternative standards are based on ANSI/RESNET/ICC 301-2022, ANSI/RESNET/ICC 380-2022 and ANSI/RESNET/ACCA/ICC 310-2020 together with their respective HERS Standards addenda. All HERS Standards addenda listed for the minimum or the alternative voluntary compliance path apply to that path only. Neither path allows HERS addenda not listed for it to be used for the other path.
The ANSI/RESNET/ICC 301-2022, ANSI/RESNET/ICC 380-2022 and ANSI/RESNET/ACCA/ICC 310-2020 standards together with the HERS Standards addenda that amend them will become the mandatory minimum on January 1, 2027. Mandatory compliance with the minimum standards is determined by the building permit date or an alternative as indicated in Chapter 3.
The Standards originally adopted January 1, 2013 and approved addenda are posted at HERS® Standards Addenda.
To download a PDF version of the current HERS Standard, click here.
To view archived versions, please click here.
Published by:
Residential Energy Services Network, Inc.
401 Century Parkway #541
Allen, TX | 75013 US
www.resnet.us
Submitting Proposed Amendments to the RESNET Standards
RESNET welcomes proposed amendments to the HERS Standards. The proposed amendment must be submitted online. To submit a proposed amendment, fill out the RESNET Online Standard Amendment Form.
After RESNET receives a proposed amendment it is reviewed by the Standards Management Board to determine when it will be addressed. Proposed amendments will be forwarded to the appropriate Standards Development Committee. The committee will review the proposal and either request additional information, reject the proposal and inform the proponent the reason for rejecting or submit it to the RESNET standard amendment development process including public review and comment.