RESNET Board Interpretation of the Date of the Policy Requiring That all Accredited HERS® Rating Software Programs Must be Based on Hourly Calculations On December 14, 2017, the RESNET Board of Directors formally adopted the following policy requiring that all accredited HERS® Rating software programs must be based on hourly calculations: “All accredited HERS® software programs shall demonstrate that their simulation engines are hourly based as part of the 2020 accreditation process.” To provide RESNET accredited Rating Providers and certified RESNET HERS® Raters clear direction on the effective date of the policy the RESNET Board of Directors has adopted a formal interpretation on the implementation of the policy. The following is the formal interpretation of the implementation of this policy: Accredited Rating Providers shall ensure that all homes with permit dates on or after January 1, 2020 are registered in software versions marked as hourly on the RESNET website. After January 1, 2020, accredited HERS® Software Tools listed at: https://www.resnet.us/providers/accredited-providers/hers-software-tools/ will indicate whether the version is hourly based. will indicate whether the version is hourly based.
