Blower Door Testing Swansea MA - Quick Facts
Local energy code in Swansea
- Swansea enforces the Massachusetts Stretch Energy Code 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 Swansea is on the Stretch Code.
Blower door requirement in Swansea
- New homes in Swansea must test at 3.0 ACH50 or tighter under the Massachusetts Stretch Code.
- Air-leakage testing is mandatory, measured with a calibrated blower-door fan to the RESNET / ASTM protocol - there is no inspection-only substitute for the result.
- Companion duct leakage limit: 4 CFM25 per 100 sq ft of conditioned floor area when ducts run outside conditioned space.
- Same-day preliminary results; final report in 24-48 hours, filed with the Swansea building department.
2026 Mass Save incentives in Swansea
- A tight result unlocks Mass Save all-electric incentives ($7,500 to $25,000 per new single-family home); an all-electric renovation testing at 3.0 ACH50 or better reaches the Level 2 tier, up to $30,000.
- Incentives require a Mass Save-approved, RESNET-certified HERS rater.
RESNET-certified · 15,000+ ratings completed · 5.0 stars across 135 Google reviews · (617) 501-6788
Blower Door Testing Swansea MA
Certified blower door testing in Swansea - we measure your home's air-tightness in ACH50, pinpoint leaks, and document a passing result for your building permit.
Air-tightness at a glance
Blower Door Testing Swansea MA
A blower door test is the code-required way to prove how airtight a home in Swansea really is. A calibrated fan depressurizes the house to 50 Pascals so we can measure exactly how much air leaks through the envelope, reported as air changes per hour (ACH50). New construction must reach 3.0 ACH50 or lower, while remodels are allowed up to 5.0 ACH50.
| Project type | Max ACH50 | Notes |
|---|---|---|
| New construction | 3.0 or lower | Mandatory blower-door test under R402.4.1.2 |
| Remodel / alteration | 5.0 | Realistic target for existing assemblies |
| Addition < 1,000 sq ft | Exempt* | May be exempt from testing (R502.3.1) |
| Passive House / Specialized | 0.6 | Whole-building test, Phius/PHI protocol |
*Confirm with your local building department. Requirements per the 2025 MA Stretch Energy Code Technical Guidance.
How Blower Door Testing Works in Swansea
The fan mounts in an exterior doorway and holds the home at a fixed 50-Pascal pressure difference - about what a 20 mph wind would exert. The airflow required to maintain that pressure, in CFM, converts to ACH50 using the home's conditioned volume.
The code converts the result to Q50 (CFM at 50 Pa) with Q50 = (Volume × ACH50) ÷ 60. A 2,700 sq ft home at 2 ACH50 works out to roughly 810 CFM50.
Keeping Heat In During Swansea Cold Spells
During a New England cold snap the stack effect goes to work: warm indoor air rises and slips out near the top of the house, and that pulls cold outdoor air in through gaps down low. The colder it gets, the harder this effect pushes - so a leaky home loses the most heat exactly when it can least afford to.
Once the leaks are found and sealed, the home retains heat far longer between heating cycles. Floors stay warmer, temperatures hold steady on windy nights, and the reduced heating load shows up directly on winter utility bills.
Lower heating load
Less infiltration means a smaller winter heat-loss load and equipment that can keep up.
Retain paid-for heat
Warm air stays in the living space instead of escaping out the top of the house.
Steadier comfort
Fewer cold-floor drafts and a temperature that holds between heating cycles.
Where Swansea Homes Leak Air
During depressurization the leaks are exaggerated, making them easy to find. In Bristol County's older housing stock the usual suspects are rim joists, top plates, attic hatches, recessed lights, and penetrations for plumbing and wiring. Coastal and exposed sites feel wind-driven infiltration most, so a tight, verified envelope pays back quickly here.
Best Fit for Projects Like
- Gut renovations and deep-energy retrofits
- Additions over 1,000 sq ft that trigger testing
- Custom and high-performance builds
- Pre-drywall diagnostic testing for builders
- New single-family homes needing a code compliance test
Blower Door Testing Swansea MA Facts
Passive House airtightness
On the Specialized Code / Passive House path, whole-building airtightness follows Phius or PHI protocols - often around 0.6 ACH50, roughly ten times tighter than base code.
Remodel threshold
Remodels and alterations to existing homes are held to a more achievable 5.0 ACH50, recognizing that older assemblies are harder to seal than new framing.
The ACH50 metric
Results are reported as ACH50 - air changes per hour at 50 Pascals. It tells you how many times per hour the home's entire volume of air would be replaced under that test pressure.
Who needs a test
New homes, gut renovations, many additions, and Mass Save incentive projects all rely on a blower-door number to demonstrate performance.
Trusted for Blower Door Testing Swansea MA
Best decision I made was hiring Home Energy Efficiency Consultants LLC. Their attention to detail and willingness to answer all my questions made the process stress-free.
Five stars isn't enough. The team at Home Energy Efficiency Consultants LLC goes above and beyond every time. They're the gold standard for HERS ratings in Massachusetts.
Knowledgeable and professional. Highly recommend them if you want a thorough efficiency assessment.
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
FAQ About Blower Door Testing Swansea MA
How does air sealing help during a cold spell?
In winter the stack effect drives warm air out the top of the house and pulls cold air in low down, and it gets stronger the colder it is. A tight, tested envelope blunts that effect, so you retain more of the heat you have paid for and your heating system can keep up during a deep freeze.
Why does air leakage matter for my heating bill?
Uncontrolled leakage can add 30% or more to heating and cooling costs. Every cubic foot of heated air that leaks out has to be reheated, so a tight envelope directly lowers your load.
What does the 50 Pascal test pressure represent?
Fifty Pascals is roughly the pressure a 20 mph wind exerts on the whole building. Testing at a fixed pressure makes the result repeatable regardless of the weather that day.
Where do most leaks occur?
Common culprits are rim joists, top plates, attic hatches, recessed lights, plumbing and wiring penetrations, and gaps around windows and doors.
Can a blower door test find where my home is drafty?
Yes. Depressurizing the home exaggerates the leaks so a rater can pinpoint exactly where outdoor air is entering, which guides targeted air sealing.
What ACH50 does new construction need to pass?
New residential construction in Massachusetts must measure 3.0 ACH50 or lower. Many high-performance homes come in well below that figure.
Get Started With Blower Door Testing Swansea MA
Book a certified blower door test and get a permit-ready air-tightness report. Call 617-501-6788.
HERS Ratings Across Swansea and Nearby Communities
Home Energy Efficiency Consultants rates new homes, additions, and major renovations throughout Swansea — including Swansea Center, Ocean Grove, and Hortonville. Every Swansea project is filed with the Town of Swansea 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 Swansea, including Somerset, Fall River, Rehoboth, Seekonk, and Dighton. Our Framingham office at 68 South St is the closest of our four Massachusetts locations — see our Framingham office or call (617) 501-6788 to get a Swansea rating on the schedule.
More Massachusetts Towns We Serve
Certified HERS ratings, blower door testing and energy code compliance across all 351 Massachusetts cities and towns.
