Duct Leakage Testing Everett MA - Quick Facts
Local energy code in Everett
- Everett is a Stretch Code community - the statewide baseline for new construction and major renovations. IECC Climate Zone 5A.
- Massachusetts has three energy-code levels - base (2021 IECC), Stretch, and Specialized (Opt-In) - and Everett is on the Stretch Code.
Duct leakage requirement in Everett
- Everett permits under the Massachusetts Stretch Code cap duct leakage at 4 CFM25 per 100 sq ft of conditioned floor area.
- Testing is required unless the entire duct system and air handler sit inside conditioned space; a rough-in test and a final test may both apply.
- Results in 24-48 hours with clear pass/fail documentation, filed with the Everett building department.
- From $350 for the first ducted system, often bundled with blower door testing and a full HERS rating.
Mass Save rebates for Everett (2026)
- Duct and blower door results feed the HERS rating that unlocks Mass Save all-electric incentives: $7,500 to $25,000 per new single-family home and $1,000 to $3,750 per multifamily unit.
- Incentives require a Mass Save-approved, RESNET-certified HERS rater.
RESNET-certified · 15,000+ ratings completed · 5.0 stars across 136 Google reviews · (617) 501-6788
Duct Leakage Testing Everett MA
Certified duct leakage testing for Everett, measured with a calibrated duct blaster and documented for your permit and HERS rating.
Duct Leakage Requirements in Everett
Everett follows the Massachusetts Stretch Code, which caps total duct leakage at 4 CFM25 per 100 square feet. Our raters measure your ductwork in CFM25 and document a clear pass against the 4 CFM25 per 100 sq ft limit.
| Project / code tier | Duct leakage limit | What is tested |
|---|---|---|
| Base energy code | 4.0 CFM25 / 100 sq ft | Total leakage (ducts outside conditioned space) |
| Stretch Code | 4 CFM25 / 100 sq ft (total) | Total leakage (leakage to outside is not a code option) |
| Rough-in test, air handler not installed | 3.0 CFM25 / 100 sq ft | Total leakage (Stretch and Specialized) |
| Ducts fully inside envelope | 8.0 CFM25 / 100 sq ft (test still required) | Air handler + ducts in conditioned space |
IECC Duct Leakage Thresholds Reference
Beyond the Massachusetts tier that applies in Everett, these are the federal IECC duct-leakage limits across code editions. All values are CFM at 25 Pascals (CFM25) per 100 sq ft of conditioned floor area (CFA) unless noted.
2009 IECC
| Test stage | Measurement | Leakage limit |
|---|---|---|
| Postconstruction Leakage Test | Duct Leakage to Outdoors | ≤ 8 CFM25 / 100 sq ft CFA |
| Rough-in with AHU | Total Duct Leakage | ≤ 6 CFM25 / 100 sq ft CFA |
| Rough-in without AHU | Total Duct Leakage | ≤ 4 CFM25 / 100 sq ft CFA |
2012, 2015, 2018 & 2021 IECC — Prescriptive Paths
| Test stage | Measurement | Leakage limit |
|---|---|---|
| Postconstruction Leakage Test | Total Duct Leakage | ≤ 4 CFM25 / 100 sq ft CFA |
| Rough-in with AHU | Total Duct Leakage | ≤ 4 CFM25 / 100 sq ft CFA |
| Rough-in without AHU | Total Duct Leakage | ≤ 3 CFM25 / 100 sq ft CFA |
2015 & 2018 IECC — Performance Path (Cost Compliance)
Leakage testing is required unless all ducts and air handlers are located entirely within the thermal envelope. There is no pass/fail threshold for duct leakage on the performance path.
2024 IECC — Prescriptive Path
| Conditioned floor area | Condition at test | Total leakage limit |
|---|---|---|
| >1,000 sq ft CFA | Space-conditioning equipment not installed | < 3 return grilles: ≤ 3 CFM · 3+ return grilles: ≤ 4 CFM |
| >1,000 sq ft CFA | All components installed | < 3 return grilles: ≤ 4 CFM · 3+ return grilles: ≤ 6 CFM |
| >1,000 sq ft CFA | Equipment not installed, ducts entirely in conditioned space | < 3 return grilles: ≤ 6 CFM · 3+ return grilles: ≤ 8 CFM |
| >1,000 sq ft CFA | All components entirely in conditioned space | < 3 return grilles: ≤ 8 CFM · 3+ return grilles: ≤ 12 CFM |
| ≤1,000 sq ft CFA | Equipment not installed | ≤ 30 CFM |
| ≤1,000 sq ft CFA | All components installed | ≤ 40 CFM |
| ≤1,000 sq ft CFA | Equipment not installed, ductwork entirely in conditioned space | ≤ 60 CFM |
| ≤1,000 sq ft CFA | All components entirely in conditioned space | ≤ 80 CFM |
How Duct Leakage Testing Works in Everett
A duct blaster seals off your HVAC system and pressurizes it to 25 Pascals. The airflow needed to hold that pressure is your leakage rate in CFM25 — the lower the number, the tighter the ducts.
Common Sources of Duct Leakage We Check in Everett
Most duct leakage comes from a short list of predictable weak points. Knowing where to look is what turns a CFM25 number into a fixable list of locations.
Boot & register connections
The joint where a duct boot meets the drywall is the single most common leak point — often left unsealed behind the register grille.
Plenum & air-handler seams
Sheet-metal plenums and the cabinet of the air handler leak at seams and access panels unless mastic-sealed.
Disconnected flex runs
Flexible ducts can pull loose at collars or get crushed above insulation, dumping conditioned air into the attic.
Panned-joist returns
Return cavities framed from floor joists or wall studs are notoriously leaky and can draw in unconditioned air.
Building-cavity returns
Using framing cavities as return ducts pulls air from attics, garages, or crawlspaces instead of living space.
Trunk-line joints
Long supply trunks flex and separate at joints over time, especially where they were only taped rather than sealed with mastic.
Why Tight Ducts Keep Heat In Your Everett Home
In Everett, leaky ducts quietly waste a large share of what your furnace or heat pump produces, sending warm or cool air into spaces no one lives in.
A verified-tight duct system means a right-sized furnace or heat pump can deliver its full output where it's needed, steadying comfort and cutting waste.
What Your Everett Duct Test Report Includes
You get a document your building department and HERS software will accept the first time — not just a number.
- ✓The test method used (rough-in or post-construction) per ANSI/RESNET/ICC 380
- ✓Documentation formatted for your HERS rating and building-permit file
- ✓A punch list of leak locations if a re-seal and retest is needed
- ✓Measured total duct leakage in CFM at 25 Pascals (CFM25)
- ✓Leakage normalized per 100 sq ft of conditioned floor area
- ✓Clear pass/fail against the 4.0 CFM25 limit that applies in Everett
Best Fit for Projects Like
- Everett new-construction homes needing a duct test to complete the HERS rating
- Homes switching to a heat pump where duct tightness protects the new system's output
- Whole-home renovations pursuing energy-code sign-off in Middlesex County
- Additions in Everett where new HVAC ducts must comply with Section R403
- Everett projects that need both envelope air-tightness and duct testing documented in one visit
Duct Leakage Testing Everett MA Facts
- When supply leaks dominate, the house runs slightly negative to outside; when return leaks dominate, it runs positive — both pull unconditioned air through the envelope.
- ENERGY STAR estimates that sealing leaky ducts can cut a home's heating and cooling bills by 20% or more.
- Test results are reported as CFM25 and normalized per 100 square feet so any home can be compared to the code limit.
- A rough-in test isolates the duct system before the air handler is connected, giving the tightest early read on the installation quality.
Trusted for Duct Leakage Testing Everett MA
Our Massachusetts Service Locations
Serving clients from our Massachusetts locations in Everett, Somerville, and Framingham.
Everett Location
371 Main St
Everett, MA 02149
Somerville Location
519 Broadway
Somerville, MA 02145
Framingham Location
68 South St
Framingham, MA 01702
Duct Leakage Testing for Everett Homes
Everett is home to one of our offices, at 371 Main St, so Everett duct tests are close to home for our raters. The city adopted the Massachusetts Stretch Code effective July 1, 2015, and it is not on the Specialized (Opt-In) Code list.
What the code asks for
Every ducted heating or cooling system in a new Everett home gets a total duct leakage test. It passes at 4.0 CFM25 or less per 100 sq ft of conditioned floor area. If all the ducts and the air handler sit inside conditioned space, the limit is 8.0 CFM25 per 100 sq ft. The test is still required in that case.
Two-families, triple-deckers and their ducts
A MAPC housing needs assessment for Everett estimates that about 57% of the city's housing is in buildings built before 1940, and that more than half of the housing supply is small multifamily with two to four units, mostly two-families and triple-deckers. When those buildings get new ducted systems, ducts go into the top-floor attic, the basement ceiling, and closets or soffits on the floors in between. In those tight runs we look hardest at:
- Boot-to-drywall or boot-to-plaster gaps at the registers
- Flex duct connections crushed or pulled loose in the attic
- Air handler access panels and cabinet seams
- Trunk joints and returns in the basement
Why test at rough-in and at final
The rough-in test, before insulation and drywall, catches leaks while the installer can still reach them. The final test proves the finished system for the energy-code file and the HERS rating. On a ducted heat pump, leakage cuts airflow to the far rooms and raises the HERS score, so a tight system pays off twice.
Everett's Department of Inspectional Services is at City Hall, 484 Broadway, Room 26 (617-394-2220), and permits are filed through the city's ViewPoint Cloud online permit center. Electricity and gas in Everett come from National Grid.
Real duct leakage tests by HEEC for Everett projects
These are photos from Home Energy Efficiency Consultants duct leakage testing jobs in Massachusetts — the same equipment and setup our certified raters bring to Everett homes.
Duct Leakage Testing Everett MA FAQ
Duct Leakage Test Requirements for Everett Projects
Everett adopted the Massachusetts Stretch Code (225 CMR 22.00) effective July 1, 2015 and is not on the Specialized (Opt-In) Code list. The testing requirements below come from 225 CMR 22.00 and the 2021 IECC it amends.
| Test | Limit (CFM25 per 100 sq ft of conditioned floor area) | Notes |
|---|---|---|
| Rough-in, air handler installed | 4.0 total leakage | ANSI/RESNET/ICC 380 or ASTM E1554 |
| Rough-in, air handler not installed | 3.0 total leakage | Air handler added later |
| Post-construction | 4.0 total leakage | Final test with the system complete |
| Ducts and air handler entirely inside the thermal envelope | 8.0 total leakage | Test is still required |
| Ventilation-only ducts | Exempt | Only if not tied into heating or cooling ducts |
Massachusetts measures total duct leakage; "leakage to outside" is not a code option. Under the Massachusetts amendment to R403.3.5, the test must be done by a HERS Rater, HERS Rating Field Inspector or BPI Certified Professional, with a signed report to the Everett building department. Mechanical ventilation airflow must also be tested and verified by a HERS Rater under R403.6.3.
Sources: 225 CMR 22.00 (2025 edition) and the 2021 IECC sections listed. Everett is in Middlesex County, served from our Somerville (519 Broadway) office.
Duct Leakage Questions from Everett Builders
What is the duct leakage limit for a new home in Everett?
4.0 CFM25 of total leakage per 100 square feet of conditioned floor area, at rough-in or after construction. If the air handler is not installed at rough-in the limit is 3.0, and if every duct and the air handler are inside the thermal envelope the limit is 8.0.
Can leakage to outside be used instead of total leakage?
No. The Massachusetts code (225 CMR 22.00 R403.3.5) measures total duct leakage. Leakage-to-outside tests are used by some programs, but not for code compliance here.
Who can perform the duct test in Massachusetts?
A HERS Rater, a HERS Rating Field Inspector or a BPI Certified Professional, under the Massachusetts amendment to R403.3.5. The tester signs a written report for the code official.
Is a duct test required if all ducts are inside conditioned space?
Yes. Massachusetts follows the 2021 IECC, which still requires the test but allows up to 8.0 CFM25 per 100 square feet when the ducts and air handler are entirely inside the thermal envelope.
Rough-in or final: which test is better?
A rough-in test catches leaks while every joint is still reachable, so fixes are cheap. A post-construction test confirms the finished system. Many builders do both to avoid surprises at final.
How much does duct leakage testing cost in Everett?
Our duct testing is $350 for the first ducted system and $250 for each additional system at the same address. It can be done in the same visit as the blower door test and HERS inspection.
Related: Blower door testing in Everett · HERS rating in Everett · Stretch Code help in Everett
Get Started With Duct Leakage Testing Everett MA
Fast scheduling and permit-ready CFM25 reports for Everett and all of Middlesex County.
Call 617-501-6788
Mass Save®-Listed HERS Rater
U.S. DOE Efficient New HomeTrusted Partner — Verified
ENERGY STAR®Partner
Phius CertifiedPassive House Verifier
ICCMember★★★★★136 Google
Reviews
The Phius Certified Verifier logo is used under license from Phius.
HERS Ratings Across Everett and Nearby Communities
Home Energy Efficiency Consultants rates new homes, additions, and major renovations throughout Everett — including Everett Square, Glendale, West Everett, and Woodlawn. Every Everett project is filed with the City of Everett Inspectional Services Department, and we handle the energy model, blower door and duct leakage testing, and the compliance paperwork from start to finish.
We also serve the communities right around Everett, including Malden, Chelsea, Medford, Revere, and Somerville. Our Everett office at 371 Main St is the closest of our four Massachusetts locations — see our Everett office or call (617) 501-6788 to get a Everett rating on the schedule.
