Duct Leakage Testing Cape Cod, MA
Certified duct leakage testing in Cape Cod, Massachusetts. Verify your HVAC duct system performance for Massachusetts Stretch Energy Code compliance, Mass Save eligibility, and HERS ratings.
Schedule Duct Testing Call 617-584-18092026 Massachusetts Energy Code Facts — Cape Cod
Cape Cod builders must comply with the Massachusetts energy code in force locally — Base, Stretch (225 CMR 22), or the Municipal Opt-in Specialized Code (225 CMR 23). As of the June 2026 Mass.gov adoption list, 242 of 351 Massachusetts municipalities enforce the Stretch Code and 60 have opted into the Specialized Code. New homes under the Stretch Code must reach a maximum HERS Index of 42 (mixed-fuel) or 45 (all-electric), verified by a RESNET-certified HERS rater.
- Energy code status: See the Mass.gov municipal adoption list for current status (as of the June 2026 Mass.gov adoption list).
- 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 Cape Cod services: HERS Rating Cape Cod · Blower Door Testing Cape Cod · Stretch Code Compliance Cape Cod · 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 Cape Cod Energy Code
Is a HERS rating required in Cape Cod, MA?
Most of the region does — 242 of 351 Massachusetts municipalities enforce the Stretch Code, which requires a certified HERS rating for new dwellings. Check your town on the Mass.gov adoption list or call us and we’ll confirm your requirements.
What HERS index do new homes in Cape Cod need to hit?
In Stretch Code communities, new homes must score HERS 42 or lower (mixed-fuel) or 45 or lower (all-electric); ADUs fall in the 52–58 range and major alterations/additions in the 65–75 range.
What building energy code is Cape Cod on right now?
It varies by municipality: 242 Massachusetts towns enforce the Stretch Code, 60 the Specialized Opt-in Code, and 49 the Base Code as of the June 2026 Mass.gov list.
Official Maximum HERS Index Scores (Table R406.5)
For comparison, here is the official maximum-HERS table that applies in Massachusetts Stretch Code and Specialized Code communities (Table R406.5, 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.
Detail sourced from the 2025 Massachusetts Stretch & Specialized Codes Technical Guidance (DOER, Sept 2025), Table R406.5 and Appendix RC.
Duct Leakage Testing in Cape Cod, MA
HERS Rating Company provides certified duct leakage testing in Cape Cod, Massachusetts. Our RESNET-certified technicians measure the air tightness of your HVAC duct system, ensuring compliance with the Massachusetts Stretch Energy Code and helping you qualify for Mass Save incentives.
Duct leakage testing is required for new construction in Cape Cod under IECC 2021 and the MA Stretch Energy Code. Leaky ducts waste energy, reduce comfort, and can cause moisture problems — our testing identifies issues early, before walls are closed up.
What Is Duct Leakage Testing?
Duct leakage testing (also called duct blaster testing) measures how much air leaks from your HVAC duct system. Using a calibrated fan connected to the duct system, we pressurize the ducts and measure leakage at 25 Pascals — reported as CFM25 (cubic feet per minute).
The Massachusetts Stretch Energy Code requires duct leakage to total (leakage to outside) of 4 CFM25 per 100 sq ft of conditioned floor area or less. We test your system and provide full documentation for the Cape Cod building department.
Benefits of Professional Duct Leakage Testing in Cape Cod
- Code Compliance — Required for new construction under MA Stretch Energy Code in Cape Cod
- Energy Savings — Leaky ducts can waste 20-30% of heating and cooling energy
- Improved Comfort — Even heating and cooling distribution throughout your home
- Better Air Quality — Reduces infiltration of dust, allergens, and outdoor pollutants
- Mass Save Eligibility — Required verification for many Mass Save rebate programs
- HERS Score — Duct leakage results contribute directly to your HERS Index rating
Our Duct Leakage Testing Process in Cape Cod
- Review of HVAC system plans and duct layout
- Setup of Minneapolis Duct Blaster calibrated testing equipment
- Total duct leakage test at 25 Pascals (CFM25 total)
- Duct leakage to outside measurement (most stringent standard)
- Digital report with all measurements and code compliance determination
- Pre-drywall testing available to identify and fix leaks before walls close
When Do You Need Duct Leakage Testing in Cape Cod?
Duct leakage testing is required in Cape Cod for: new residential construction, major HVAC system replacements, home additions with new ductwork, and when applying for Mass Save duct sealing rebates. We recommend pre-drywall testing so any issues can be corrected before the ductwork is sealed inside walls and ceilings.
Need duct leakage testing in Cape Cod, MA? Get fast results from our certified team.
Get a Free Quote Call 617-584-1809Related Services in Cape Cod
HERS Rating Cape Cod MA | Blower Door Testing Cape Cod MA | Stretch Code Compliance Cape Cod MA