The Mandatory Compliance Date for HERS Software That Complies with ANSI/RESNET/ICC 301-2019 Standard Extended to July 1, 2021

There is a lot to be excited about in the changes presented in the ANSI/RESNET/ICC 301-2019 Standard with Addenda A and B, including the ability to rate units in buildings four stories and above and the opportunity to receive credit for quality HVAC installation. This was not a trivial change by any means and required a substantial development effort on behalf of the HERS Software Providers. The date that HERS Raters must use the new versions of the software (Mandatory Compliance Date) was appropriately extended multiple times to accommodate these challenges.

However, without software tools available to perform ratings, it was not possible for raters to take advantage of the full voluntary compliance period for the new standard and adequately prepare for the changes that the new standard brought with it. The voluntary compliance period is an important aspect of RESNET’s standards development process that was sidelined due to the delays in software tools’ implementations of the new standard.

To address this the RESNET Standards Management Board has extended the Mandatory Compliance Date for Addendum 42, Adoption of Standard ANSI/RESNET/ICC 301-2019 to July 1, 2021. This means that homes that are permitted on July 1, 2021, or later must use software that includes the changes in 301-2019.

This extends the voluntary compliance period to allow raters, providers, builders, and code officials more time to understand the impacts that the new standard will have on the scores of HERS rated homes.

RESNET is working to develop a policy to remedy this in the future. We are considering adding a software accreditation date prior to the voluntary compliance date to ensure approved software tools will be available to HERS raters to test the new version prior to mandatory compliance with the standard.

Latest News & Upcoming Events


WHAT IS HERS? The HERS Index is the industry standard by which a home's energy efficiency is measured. HERS stands for Home Energy Rating System and was developed by RESNET. RESNET is a recognized standards-making body for building energy efficiency rating and...

DOE Forms New Office to Support Clean Energy Technology

President Biden’s Bipartisan Infrastructure Law provides more than $20 billion which the DOE will oversee in using to establish the DOE’s Office of Clean Energy Demonstrations. The creation of this new office will spotlight the importance of the DOE’s movement towards...

Summer Energy Saving Tips

Latest News & Upcoming Events Upcoming Events Our Partners & Sponsors Give Today $5 $10 $50 $250 $500 Other Get In Touch

Raters Can Assist with Code Testing

In the most recent issue of Building Safety Journal, the ICC announced the building code officials can accept certified RESNET HERS Raters to do required energy code inspections and testing. As a result of the COVID-19 pandemic, the ICC found that Building safety...

Upcoming Events


Feb 2020


Feb 2020

RESNET Conference

The RESNET Building Performance Conference provides a diverse and dynamic venue where you can obtain usable solutions in an evolving industry. Get up to date on strategic solutions for you and your business, network with like-minded professionals, and take home fresh information and for the home performance industry.  More Details

Govenor’s Energy Summit 

The Governor’s Office of Energy Development, in partnership with Utah Media Group and HBW Resources, is pleased to invite you to the 9th Annual Governor’s Energy Summit.  This premier conference and trade show is the largest event of its kind in the Intermountain West, hosting more than 1,200 attendees and 75+ speakers from across the nation and around the globe. More Details

Our Partners & Sponsors

Give Today







Get In Touch