Duct Leakage Testing Haverhill MA - Quick Facts
Local energy code in Haverhill
- Haverhill 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 Haverhill is on the Stretch Code.
Duct leakage requirement in Haverhill
- Haverhill 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 Haverhill building department.
- From $350 for the first ducted system, often bundled with blower door testing and a full HERS rating.
Mass Save rebates for Haverhill (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.
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Duct Leakage Testing Haverhill MA
RESNET/HERS duct leakage testing in Haverhill — fast, precise CFM25 results your building department and energy-code file can rely on.
Duct Leakage Requirements in Haverhill
Haverhill 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 (every ducted system) |
| 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 Haverhill, 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 Haverhill
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 Haverhill
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 Haverhill Home
In Haverhill, 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.
Once the ducts test tight, the heat you pay for stays in the living space, the system cycles less, and utility bills settle down.
What Your Haverhill Duct Test Report Includes
You get a document your building department and HERS software will accept the first time — not just a number.
- ✓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 Haverhill
- ✓The test method used (rough-in or post-construction) per ANSI/RESNET/ICC 380
Best Fit for Projects Like
- Additions in Haverhill where new HVAC ducts must comply with Section R403
- Haverhill projects that need both envelope air-tightness and duct testing documented in one visit
- Rough-in duct tests before the air handler is set, which must hit 3.0 CFM25 per 100 sq ft
- Homes switching to a heat pump where duct tightness protects the new system's output
- Custom homes with complex duct runs that need verification before final inspection
Duct Leakage Testing Haverhill MA Facts
- A rough-in test isolates the duct system before the air handler is connected, giving the tightest early read on the installation quality.
- A tight duct system lets a right-sized furnace or heat pump deliver its full rated output to the rooms that need it.
- Sealing leaky ducts steadies room-to-room temperatures and cuts the energy wasted heating or cooling empty attics and crawlspaces.
- Failing a duct leakage test can stall energy-code sign-off and delay a certificate of occupancy.
Trusted for Duct Leakage Testing Haverhill 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 Haverhill Homes
Haverhill adopted the Stretch Code effective July 1, 2018, and is not on the Specialized (Opt-In) Code list. What that means for your ductwork is simple. Every ducted heating or cooling system in a new Haverhill home needs a total duct leakage test, and it passes at 4.0 CFM25 or less per 100 sq ft of conditioned floor area. If every duct and the air handler are inside conditioned space, the limit is 8.0 and the test is still required.
A city of old and newer homes. Census estimates show about 38 percent of Haverhill's housing was built before 1940, while the median year built is 1964. A little over half of units are single-family houses, and about a quarter are in two- to four-unit buildings. That mix gives us two common duct layouts: upstairs runs in a cold attic with first-floor runs in the basement in single-family homes, and attic or basement-ceiling runs added to older multi-unit buildings during renovations.
Where the leaks hide. Boot-to-drywall gaps behind the registers, flex duct connections at the trunk, unsealed seams on the air handler cabinet and access panels, and takeoffs along basement trunks account for most of what we find.
Why test at rough-in. Sealing a joint before the ceiling is closed takes minutes. Finding it after the final test fails can mean opening drywall. The final test, with the system complete, is what the inspector needs to see.
Heat pumps. A ducted heat pump depends on delivering its full airflow to every room. Leakage robs that airflow, makes far rooms uncomfortable and raises the HERS score.
Haverhill's Inspectional Services Department is in City Hall, Room 214, 4 Summer Street, (978) 374-2338. Permits are applied for through the city's OpenGov online permit center, which is also where inspection appointments are made. National Grid serves both electric and gas customers in the city, and is a Mass Save sponsor. Our nearest office is in Everett at 371 Main St.
Real duct leakage tests by HEEC for Haverhill 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 Haverhill homes.
Duct Leakage Testing Haverhill MA FAQ
Duct Leakage Test Requirements for Haverhill Projects
Haverhill is not on the Specialized Code list. It adopted the Massachusetts Stretch Code (225 CMR 22.00) effective July 1, 2018, so new homes follow the Stretch Code. 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 Haverhill 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. Haverhill is in Essex County, served from our Everett (371 Main St) office.
Duct Leakage Questions from Haverhill Builders
What is the duct leakage limit for a new home in Haverhill?
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 Haverhill?
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 Haverhill · HERS rating in Haverhill · Stretch Code help in Haverhill
Get Started With Duct Leakage Testing Haverhill MA
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HERS Ratings Across Haverhill and Nearby Communities
Home Energy Efficiency Consultants rates new homes, additions, and major renovations throughout Haverhill — from Bradford, Rocks Village, and Riverside to Mount Washington and Downtown Haverhill. Every Haverhill project is filed with the City of Haverhill Building 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 Haverhill, including Groveland, Methuen, Georgetown, Boxford, and North Andover. 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 Haverhill rating on the schedule.
