Summary
IECC 2024 Rescheck vs IECC 2021 Rescheck
IECC 2021 Rescheck vs. IECC 2024 Rescheck: What’s Changed?
This artice was written by Jobe Leonard of the Reschexpert blog. He enjoys comparing all versions of Reschecks to one another and finding out the major and minor differences.

Jobe Leonard Rescheck.info
The International Energy Conservation Code (IECC) is regularly updated to improve energy efficiency in buildings. This means that the Residential Energy Services Network (RESNET) Accredited Raters must stay up-to-date on the latest code requirements.
Key Differences Between IECC 2021 and IECC 2024 Rescheck Reports:
- Updated Energy Efficiency Standards: IECC 2024 introduces more stringent energy efficiency standards across various building components. This can impact the overall energy performance of a home and, consequently, the results of a Rescheck analysis.
- Revised HVAC System Requirements: Changes in HVAC system requirements might necessitate adjustments to the Rescheck model and calculations, potentially affecting the final energy scores.
- New or Modified Building Envelope Requirements: Updates to insulation requirements, window specifications, and air sealing standards can significantly influence the energy performance of the building envelope. These changes will be reflected in the Rescheck analysis.
- Changes in Water Heating Systems: Modifications to water heating system requirements, such as efficiency standards or installation practices, will be incorporated into the Rescheck calculations.
- Updated Duct Leakage Testing Standards: More stringent duct leakage testing standards in IECC 2024 may lead to stricter requirements for duct sealing and testing, impacting the overall energy performance of the HVAC system.
What Does This Mean for Homeowners and Builders?
- Higher Energy Efficiency Standards: Homes built to the 2024 code will generally be more energy-efficient, resulting in lower energy bills and a reduced environmental impact.
- Increased Construction Costs: The more stringent requirements in IECC 2024 may lead to slightly higher construction costs due to the need for upgraded materials and potentially more complex installations.
- Improved Home Comfort: Enhanced energy efficiency can translate to improved indoor air quality and greater thermal comfort for homeowners.
- Need for Updated Expertise: Building professionals, including architects, engineers, and builders, will need to stay informed about the latest code requirements to ensure compliance and achieve the desired energy performance.
IECC 2024 Energy Code Rescheck
Conclusion:
The transition from IECC 2021 to IECC 2024 brings about significant changes in energy efficiency standards for residential buildings. These changes are reflected in the Rescheck analysis, which is a crucial tool for assessing the energy performance of homes. By staying informed about these updates, homeowners and builders can ensure that their homes meet the latest energy efficiency requirements and contribute to a more sustainable future.
If you need an IECC 2021 Rescheck or IECC 2024 Rescheck we can handle it for you. Email your PDF plans, jobsite address, and square footage to service@rescheck.info and we will get you taken care of.

