Duct Leakage Testing in Acton, MA — Specialized Energy Code Town
RESNET-certified duct leakage (duct blaster) testing for new construction, HERS Ratings, Mass Save programs, and MA Stretch Code compliance in Acton, MA.
2026 Massachusetts Energy Code Facts — Acton
Acton enforces the Municipal Opt-in Specialized Energy Code (225 CMR 23), effective 1/1/2024 — one of only 60 Massachusetts municipalities to adopt it (a Stretch Code community since 1/1/2011). For 2026 permits, new homes must reach a maximum HERS Index of 42 (mixed-fuel) or 45 (all-electric) — up to 48 with qualifying credits — verified by a RESNET-certified HERS rater. ADUs must meet HERS 52–58, and major alterations, additions or change-of-use projects HERS 65–75, depending on fuel type and on-site solar. Acton is also an all-electric town: it is one of only 10 Massachusetts municipalities in the state’s Fossil Fuel-Free Building Demonstration Program, so new construction and major renovations here generally cannot install gas, oil, or propane systems — heat pumps and electric equipment are the standard.
- Energy code status: Specialized Opt-in Code (adopted 1/1/2024) — 1 of 60 MA municipalities (as of the June 2026 Mass.gov adoption list).
- Specialized Code requirements in Acton: new multifamily buildings over 12,000 sq ft must be Passive House certified; all-electric homes must use heat pumps for heating and hot water; homes that keep fossil fuels need electrification pre-wiring and rooftop solar, and fossil-fuel homes over 4,000 sq ft must certify net-zero (HERS 0).
- Required testing & verification: blower door (air infiltration) testing, duct leakage testing, balanced mechanical ventilation (ERV/HRV), plus EV-ready and solar-ready provisions on the HERS compliance path. Under IECC 2021, total duct leakage may not exceed 4 CFM25 per 100 sq ft of conditioned floor area.
- Mass Save® 2026 new-construction incentives: up to $25,000 per all-electric single-family home (Passive House tier; $7,500 base tier, $15,000 ENERGY STAR® NextGen tier — HERS ≤45), up to $40,000 for a 4-unit building, up to $3,750/unit for 5+ unit multifamily, and up to $30,000 for major all-electric renovations. Every tier requires enrollment and verification by an approved HERS rating company.
Related Acton services: HERS Rating Acton · Blower Door Testing Acton · Stretch Code Compliance Acton · MA Energy Codes Guide — or get a free quote from our RESNET-certified team (617-584-1809).
Sources: 2025 DOER Massachusetts Stretch & Specialized Codes Technical Guidance (Sept 2025); Mass.gov Building Energy Code Adoption by Municipality (June 2026); Mass Save 2026 Residential New Construction program.
Common Questions About the Acton Energy Code
Is a HERS rating required in Acton, MA?
Yes. Acton follows the Municipal Opt-in Specialized Energy Code (effective 1/1/2024) on top of the Stretch Code it adopted in 1/1/2011. New dwellings need a certified HERS rating from a RESNET-accredited rater before the certificate of occupancy.
undefined
New homes in Acton must score HERS 42 or lower (mixed-fuel) or HERS 45 or lower (all-electric) — up to 48 with qualifying credits. Fossil-fuel homes over 4,000 sq ft must certify net-zero (HERS 0), and multifamily over 12,000 sq ft needs Passive House certification.
undefined
Acton is one of only 60 of Massachusetts’ 351 municipalities on the Specialized Opt-in Code (225 CMR 23) per the June 2026 Mass.gov adoption list — the state’s most stringent energy code tier.
Official Maximum HERS Index Scores (Table R406.5)
These are the official maximum HERS Index scores that apply to projects in Acton under Table R406.5 of the current code (2025 DOER Technical Guidance):
| Building type | New construction (permits after 7/1/2024) | New construction w/ embodied-carbon credit (R406.5.2) | Accessory Dwelling Units | Major alterations, additions, change of use |
|---|---|---|---|---|
| Mixed-fuel building | 42 | 45 | 52 | 65 |
| Mixed-fuel + solar electric | 42 | 45 | 55 | 70 |
| All-electric building | 45 | 48 | 55 | 70 |
| All-electric + solar electric | 45 | 48 | 58 | 75 |
Scores are measured before counting on-site renewable generation (per R406.5). Historic buildings may opt out for alterations under R503.1.1. Embodied-carbon credits (+3 points) come from low-GWP concrete and insulation EPDs per Table R406.5.3/R406.5.4.
Complete Stretch Code Compliance Requirements in Acton
Beyond the HERS maximums above, every new dwelling in Acton on the HERS pathway must satisfy four code sections — R403.6 (Ventilation), R404.4 (EV Ready), R406 (HERS) and Appendix RB (Solar Ready) — per the 2025 DOER Technical Guidance:
- Balanced mechanical ventilation (R403.6): an ERV or HRV system meeting minimum system airflow, heat/energy-recovery efficiency, fan sound ratings and regulated air-inlet and exhaust locations — verified by field testing.
- EV-Ready parking (R404.4): pre-wiring with a connection point and dedicated electrical panel capacity for future vehicle charging.
- Solar-Ready roof (Appendix RB): a dedicated solar zone with structural-load verification, an electrical interconnection pathway and reserved panel space — unless the project installs solar directly.
- Air-tightness & duct sealing: blower door result of 3.0 ACH50 or lower (Climate Zone 5) and duct leakage within 4 CFM25 per 100 sq ft.
Passive House alternative (R405): Phius or PHI certification satisfies the code in Acton in place of a HERS score — with a Certified Passive House Consultant for design and a Phius Certified Verifier/Rater during construction — and still requires EV-Ready and Solar-Ready compliance. Prescriptive path: allowed only for buildings without individually separate dwelling units, additions, and alterations — and a whole-building prescriptive project must implement 2 of the 3 additional-efficiency packages in R408 (enhanced envelope, higher-efficiency HVAC, or reduced water-heating energy). Additions of 1,000 sq ft or more (or exceeding 100% of the existing floor area) must meet both R502.3 prescriptive and the R406.5 HERS limits. Level III alterations (work area over 50% of the home and over 1,000 sq ft) also trigger HERS compliance; historic buildings are exempt under R501.6. Note that ENERGY STAR® is no longer a compliance path — HERS and Passive House are the two certification routes in Acton.
Acton’s Specialized Code: Three Ways to Comply (Appendix RC)
- Zero Energy Pathway (RC102): certify HERS 0 or lower — the home produces as much energy as it uses. Before counting on-site solar, the design must still score ≤45 (all-electric) or ≤42 (mixed-fuel) and meet IECC 2021 envelope U-factors. Alternative: Passive House plus a Phius ZERO design certification — the only Specialized option that can credit off-site renewable energy.
- All-Electric Pathway (RC103) — the most common route in Acton: comply with the R408.2 HVAC and water-heating efficiency packages (electric-resistance primary heating is excluded — heat pumps required), meet EV-Ready and Solar-Ready, then either achieve a final certified HERS of 45 or less without on-site power (with ERV/HRV, R406.2 lighting, and base-code U-factors) or pre-certify to Phius CORE / PHI. With load-management design, most all-electric homes run on a standard 200-amp panel.
- Mixed-Fuel Pathway (RC104) — only for dwellings under 4,000 sq ft: score HERS 42 or less without on-site power, plus electric-readiness (RC104.3), on-site renewables (RC104.4/RC105) and EV-Ready — or pre-certify Passive House with electric readiness. Electric readiness in Acton means a 250-volt/40-amp outlet within 3 feet of any gas or propane range, a 250-volt/30-amp outlet within 3 feet of the clothes dryer, a reserved branch circuit for a future heat-pump heating system, and a heat-pump water-heater location with 7-foot clearance.
Detail sourced from the 2025 Massachusetts Stretch & Specialized Codes Technical Guidance (DOER, Sept 2025), Table R406.5 and Appendix RC.
Professional Duct Leakage Testing Services in Acton, Massachusetts
RESNET-certified duct leakage testing for new construction, HERS Ratings, Mass Save programs, and MA Stretch Code compliance in Acton, MA. We measure total duct leakage and leakage to outdoors — the two metrics required by all Massachusetts energy codes.
New construction in Acton with forced-air HVAC must achieve total duct leakage of 4% or less of system airflow under the MA Stretch Code. Our certified reports are accepted by all Massachusetts building departments and Mass Save administrators.
Our Duct Leakage Testing Process in Acton
- Free Quote: Contact us for a transparent quote for duct testing in Acton. Package pricing with HERS Rating available.
- Schedule Test: We schedule your duct blaster test at a convenient time — including pre-drywall tests.
- On-Site Testing: Our technician connects the duct blaster fan and records total leakage and leakage-to-outside.
- Report Delivery: Certified duct leakage report delivered within 24 hours — ready for permits, Mass Save, and HERS Rating.
Related Services in Acton
HERS Rating in Acton
Duct leakage testing is included in every HERS Rating.
Learn More →Blower Door Testing in Acton
Often scheduled together to minimize mobilization costs.
Learn More →MA Stretch Code in Acton
Full compliance: HERS 55, ACH50 3.0, duct leakage 4%.
Learn More →Frequently Asked Questions — Duct Leakage Testing in Acton
How much does duct leakage testing cost in Acton, MA?
Duct leakage testing pricing in Acton: Single-family homes $1,850–$2,500 (when combined with full HERS Rating package) · Standalone duct tests start from $250. Contact us for a free quote — package pricing available with blower door testing and HERS Rating.
What is the duct leakage limit in Acton?
Under the MA Stretch Code, total duct leakage in Acton must be 4% or less of system airflow. The IECC 2021 base code allows up to 8%. Leakage-to-outside must be 4 CFM25 per 100 sq ft under both codes.
How long does duct leakage testing take in Acton?
The on-site duct blaster test in Acton takes 1–2 hours. We deliver your certified report within 24 hours.
Is duct leakage testing required in Acton?
Yes. Duct leakage testing is required for new residential construction with forced-air HVAC in Acton under both the MA Stretch Code and IECC 2021 base code, and as a component of every HERS Rating.
Schedule Duct Leakage Testing in Acton
Contact HERS Rating Company for a free quote on duct leakage testing in Acton, MA. RESNET-certified, 24-hour turnaround.
Also Serving Nearby Cities
We provide Duct Leakage Testing services throughout the region. Nearby cities we serve: Concord · Lincoln · Chelmsford · Hudson · Weston