The Ohio Valley v3.1 → v3.2 transition and what certification bodies actually check in 2026.
The current published reference for multifamily new construction remains the EPA ENERGY STAR Multifamily New Construction program, targeting roughly the performance equivalent of the 2018 IECC plus efficiency gains. ENERGY STAR Multifamily is administered through certified providers such as RESNET, and verifiers confirm HVAC sizing, duct leakage, envelope airtightness, lighting, and water heating against a defined checklist. Kentucky's climate zones, CZ 4A west, CZ 5A central and east, drive the airtightness and insulation numbers that HECS measures on the ground. Builders should note that a successor version is under development; until the EPA formally publishes a replacement, v3.1 remains the binding standard for projects seeking the label.
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Call (859) 983-7382 Get a QuoteThe HECS scope under v3.1 centers on field verification, not design. Two inspections anchor every project: the blower door test to confirm whole-building airtightness, and duct leakage testing with a calibrated duct tester to measure leakage to outside and total leakage. HECS also documents HVAC sizing per ACCA Manual J/S/D, lighting efficacy, and water-heater efficiency, then pairs the field data with the rater's energy model.
The thermal envelope checklist includes window U-factor and SHGC verification, insulation grade inspection, and blower door results. HECS field staff check window labels against the energy model and confirm framing cavities are insulated to the modeled R-value. HVAC verification includes refrigerant charge checks, airflow per ACCA Manual T, and equipment efficiency ratings from the AHRI certificate. Indoor air quality verification falls under the EPA's mandatory IAQ requirements, and HECS confirms bathroom and kitchen exhaust fans meet the airflow targets. Water-heating verification includes pipe insulation, equipment efficiency, and, when heat pumps are used, control interlock verification.
Common findings across the Ohio Valley region: refrigerant charge superheat/subcool drifts several psi from manufacturer targets on roughly a third of split systems HECS inspects before commissioning; blower door results typically land 5-15% tighter than required thresholds because builders are accustomed to earlier codes.
HECS handles ENERGY STAR MFNC third-party verification for projects in Kentucky, Indiana, Ohio, Tennessee, Illinois, and Missouri. For multifamily scopes, the HECS 45L Tax Credit Louisville KY page outlines how certification pairs with §45L documentation. Reach HECS at (859) 983-7382 or hecsusa.com/contact/ for a scope call.
What follows reflects HECS project data and the RESNET Standards sampling protocols that govern multifamily compliance. Where exact program thresholds apply, HECS references the current program documentation at the time of testing.
| Check | HECS-Verified Output | Source of Record |
|---|---|---|
| Blower door | ACH50 result, sample-unit vs. whole-building | Project test log |
| Duct leakage | CFM25 to outside, total CFM25 | Project test log |
| HVAC airflow | CFM per ton, room-by-room | ACCA Manual T reference |
| Refrigerant charge | Superheat / subcool vs. OEM chart | Manufacturer target |
For any builder comparing versions, the operative advice is simple: get field results from a certified verifier like HECS and compare against the program checklist your rater is using. Version comparison matrices circulated online frequently mix up program labels and revision numbers.
ENERGY STAR MFNC is a program label, while HERS is an indexing methodology administered by RESNET. The two combine on most projects: a HERS Index target is set and ENERGY STAR certification confirms compliance with the program's mandatory checklists alongside the index. A typical project in the Ohio Valley targeting ENERGY STAR v3.1 will require both field verification (HECS) and energy modeling (rater). The HERS Index itself is referenced in the EPA ENERGY STAR program requirements; HECS reports results through the rater of record, who submits final documentation.
For builders evaluating green certifications, NGBS-2023 and EarthCraft offer different scoring approaches, NGBS provides a points-based system across multiple categories, while EarthCraft is a Southeast-oriented program with multifamily variants. HECS is an NGBS Green Certified Verifier and EarthCraft Certified Verifier, so all three programs can run on the same project with coordinated inspections. This consolidation saves builder scheduling overhead, one field crew documents for multiple programs rather than three separate site visits.
What is the typical blower door threshold HECS reports for ENERGY STAR multifamily in Kentucky? Targets vary by sampling protocol and project tier, but in HECS project data, single-sample ACH50 results for ENERGY STAR MFNC projects typically land in the 3-5 ACH50 range across CZ 4A and CZ 5A. The exact program threshold is confirmed against the rater's checklist at pre-drywall and final. (hecsusa.com/contact/)
How does ENERGY STAR MFNC interact with HERS Index for Ohio Valley projects? A HERS Index target is set per RESNET standards, and ENERGY STAR certification confirms both the HERS target and the program's mandatory field-verified checklists. HECS performs the field side; the rater runs the energy model.
Can HECS coordinate ENERGY STAR, NGBS, and EarthCraft inspections in one site visit? Yes. As an NCI-certified air balancer and verifier for ENERGY STAR, NGBS, and EarthCraft, HECS consolidates field documentation across all three programs. This reduces builder scheduling overhead and ensures consistency in airtightness and duct leakage reporting across certification packages.
HECS supports multifamily projects across Kentucky, Indiana, Ohio, Tennessee, Illinois, and Missouri, with concentrated service in Louisville KY, Lexington KY, Cincinnati OH, Indianapolis IN, and Nashville TN. The relevant services for ENERGY STAR MFNC include HVAC Testing & Balancing, blower door and duct leakage testing, and full program verification for ENERGY STAR, NGBS, and EarthCraft. Pair these with the 45L Tax Credit certification service for projects targeting federal tax credit eligibility. For scopes that include FORTIFIED Home evaluation, HECS is an IBHS FORTIFIED Home Evaluator. Initiate a scope discussion at (859) 983-7382, [email protected], or through hecsusa.com/contact/, full service catalog at hecsusa.com/services/.
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