Summary
This blog post provides a technical breakdown of the 2024 IECC Section R408.2.2 heating credits within Rescheck. It explains how builders and designers can earn the required 10 efficiency credits by selecting high-performance gas furnaces.
Key Highlights:
The Credit System: An overview of the new 2024 IECC requirement to earn specific points for project compliance.
Detailed Breakdown: A comparison of Option 1 (97% AFUE), Option 2 (95% AFUE), and Option 3 (High-Efficiency Combo).
Credit Impact: How much each furnace tier contributes toward the 10-credit goal based on efficiency ratings.
The "None" Alternative: The potential consequences and added costs of not utilizing mechanical credits in a Rescheck report.
Compliance Tip: The importance of obtaining AHRI certificates to verify equipment performance during the inspection phase.
IECC 2024 Rescheck Credits: High-Performance Gas Furnaces Explained
If you are working on a residential project under the 2024 International Energy Conservation Code (IECC), you’ve likely noticed that simply meeting the “minimums” isn’t enough anymore. The 2024 code has shifted toward a Credit-Based System under Section R408, requiring builders to earn a specific number of points (usually 10) to achieve compliance.
About the Author
Jobe Leonard Rescheck.info
Jobe Leonard is the founder of Rescheck.info and a dedicated specialist in the field of building energy compliance. With a deep focus on the evolution of home energy audit software, Jobe provides expert insights into Rescheck, Comcheck, and Manual J calculations. He is passionate about helping builders and designers navigate the technical complexities of energy reporting to create more efficient, code-compliant homes.
One of the most effective ways to rack up these points in Rescheck is through high-performance heating equipment. Here is a breakdown of the specific gas furnace options listed under R408.2.2 and how many credits they bring to your project.
Understanding the R408.2.2 Heating Credits
The 2024 IECC divides efficiency into specific “options” based on the Annual Fuel Utilization Efficiency (AFUE) rating of the furnace. These credits are essential if you are following the Prescriptive Path in Rescheck.
Note: Credit values can shift slightly based on your specific Climate Zone. Cold climates (Zones 5-8) often see higher point yields for heating improvements than warm climates (Zones 1-2).
Deep Dive into the Options
1. R408.2.2(4): The Gold Standard (97% AFUE)
Choosing Option 1 means you are installing a top-tier condensing gas furnace. By hitting the 97% AFUE mark, you are nearly two-thirds of the way to your 10-credit requirement with a single equipment choice. This is often the “silver bullet” for tight budgets where adding extra continuous insulation or triple-pane windows might be too costly.
2. R408.2.2(5): The Industry Standard (95% AFUE)
Option 2 is the most common path for modern builds. A 95% AFUE furnace is widely available and cost-effective. While it provides 1 fewer credit than the 97% model, it still offers a massive boost toward your total Rescheck score.
3. R408.2.2(6): The Mixed-Fuel Strategy
Option 3 typically involves pairing a high-efficiency furnace ( 95% AFUE) with a high-efficiency Air Conditioner (typically 15.2 SEER2 / 12.0 EER2). In many climate zones, this “bundled” approach provides a higher credit total because it addresses both the heating and cooling loads of the home simultaneously.
Why “None” is a Risk
If you select “None” in your Rescheck software for the R408 credits, you must find those 10 points elsewhere. This usually means:
Increasing attic insulation beyond the standard R-49/R-60.
Installing expensive ultra-high-performance windows (U-factors below 0.25).
Achieving much lower Air Changes per Hour (ACH) than the code requires.
Professional Rescheck Tip
When entering data into Rescheck Web or Rescheck Desktop, ensure your mechanical trade partners provide the AHRI certificate for the furnace. The credit is only valid if the rated AFUE matches the R408 requirement exactly.
Need help navigating the 2024 IECC? Getting your Rescheck to pass with the new credit system can be tricky. Feel free to reach out for a consultation or a professional Rescheck report to ensure your project stays on track and compliant. To get a Rescheck created email pdf plans, jobsite address, and square footage to service@rescheck.info and we will get you taken care of.
