Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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After
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Before
AfterFast, Reliable Duct Sealing Across Westborough
Westborough’s old center-chimney Colonials and its Route 9 office parks share one problem: air that never reaches the room it’s supposed to heat or cool. We’re the Duct Sealing team at Hollis Air Duct Cleaning, and we’ve sealed ducts in timber-frame homes near the Town Common where HVAC was retrofitted through 200-year-old brick chimneys, plus the sealed-up 1990s buildings along I-495 where construction debris still rattles through commercial rooftop units. Scheduling runs through our Boston office, but our crews work Westborough streets weekly. If your bedroom stays cold while the basement roasts, or your energy bill climbed last winter while rooms stayed drafty, call (361) 326-5060. We’ll give you a written price before any work starts, and every seal carries our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Westborough’s Preferred Duct Sealing Company
We’ve been sealing ducts since 2004 as part of the Garrison Partners family, and Westborough’s split personality keeps us sharp. One morning we’re in a 1790s Colonial off Route 30 with flex duct squeezed through a former chimney chase; that afternoon we’re at Westborough Office Park tracing leaks in a VAV system installed during the tech boom. That range matters, because a crew that only knows new construction will miss how old timber frames move and breathe.
Our technicians are background-checked and uniformed, and they arrive inside the quoted window. The price is written down before the mastic tube comes out, and it does not move at the door. If a seal fails within a year, we come back and make it right at no charge, including a free second visit. That’s The Garrison Standard, and it’s how we work in Westborough, Northborough, and every town we serve.
Air Duct Sealing in Westborough
Air Duct Sealing in Westborough means finding and closing the gaps where conditioned air escapes into your attic, basement, or the gaps inside old walls. In a typical Westborough home, 20 to 30 percent of the air your furnace or heat pump generates never reaches the rooms you actually use. That waste shows up in winter when the snow piles past 45 inches and your heating system runs constantly, or in July when humidity climbs and your AC can’t keep the second floor tolerable.
Most Westborough homeowners need sealing when they notice uneven temperatures between rooms, dust blowing from registers even after cleaning, or utility bills that spike without explanation. In the historic districts near the Town Common, we often find original ductwork from the 1970s or 1980s that has pulled apart at the seams as the timber frame settled. In the Chauncy Lake subdivisions, the 1980s and 1990s Colonials frequently have taped joints that have dried and failed. A full residential sealing job in Westborough typically runs $800 – $1,800 depending on system size and access, with smaller partial repairs starting around $350.
How We Test Before We Seal
We pressurize your duct system and measure airflow loss with a duct blaster or similar diagnostic tool. This gives us a baseline in CFM25, cubic feet per minute of leakage at 25 pascals of pressure. A typical Westborough home before sealing measures 300 – 600 CFM25; after proper sealing with mastic and mechanical fasteners, we target under 100 CFM25. You see the numbers before we start and after we finish.
Materials That Hold Up Here
Westborough’s temperature swings, from January highs around 34°F to humid summer peaks, punish cheap tape. We use water-based duct sealing mastic for permanent joints, reinforced with mesh where gaps exceed a quarter inch. In retrofit situations, like flex duct run through unheated attics above those center-chimney Colonials, we add insulation sleeves to prevent condensation and future mold.
Duct Sealing Services in Westborough
Duct Sealing Services in Westborough cover everything from spot repairs on single runs to whole-system sealing for homes and commercial buildings. Our crew handles the unique challenges of this market: the antique homes where ducts were threaded through structural elements never designed for them, and the tight modern envelopes where even small leaks create pressure imbalances that draw garage fumes or crawlspace mold into living space.
Commercial work along Route 9 and near the I-495 interchanges differs from residential. Rooftop units serving multiple tenants often have main trunk leaks that waste conditioned air before it ever reaches the VAV boxes. We seal these with the same mastic and mechanical methods, scaled to larger galvanized duct. Commercial duct sealing in Westborough generally ranges $1,500 – $4,500 depending on system complexity and whether we need lift equipment for rooftop access.
Residential Sealing Process
A typical Westborough home takes four to six hours. We access ducts through existing registers and strategic cuts in basement or attic trunk lines, seal all joints and seams, then test again to verify improvement. The site is left clean, and we show you before-and-after photos of the work areas.
Commercial and Multi-Tenant Systems
Office buildings in Westborough Office Park and similar properties often need after-hours scheduling to avoid disrupting tenants. We coordinate timing through our Boston dispatch office and arrive with the lift equipment and containment needed for rooftop or ceiling plenum work. Every commercial job gets the same written price guarantee and 365-Day Done Right Promise as our residential work.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Westborough
Our sealing work is backed by professional-grade equipment and materials from manufacturers who understand New England’s demands. We stock mastic, reinforcement mesh, and mechanical fasteners from Abatement Technologies and Guardsman, plus filtration and pressure-testing gear from Aprilaire. These aren’t hardware-store products. Abatement Technologies designs containment and air-handling solutions for remediation contractors; their duct materials are rated for the temperature cycling and humidity extremes that Westborough’s four-season climate delivers. We keep common sizes and compounds on our trucks, so most Westborough jobs don’t wait for parts. If your system includes Aprilaire media filters or zoning controls, we can test and seal without disturbing those components.
Common Duct Sealing Problems We See in Westborough Homes
- Failed tape at flex duct connections in retrofitted chimneys. In the center-chimney Colonials near the Town Common, contractors often ran flex duct through original brick chimneys to reach second-floor rooms. The tape at these connections dries and fails within five to ten years, dumping heated air into the chimney chase and pulling cold attic air into bedrooms.
- Disconnected trunk lines in 1960s and 1970s ranches. The ranch and split-level homes in neighborhoods near Chauncy Lake frequently have galvanized trunk ducts in unconditioned crawlspaces. Ground moisture from snowmelt and spring rains corrodes hangers, causing sections to sag and separate at the seams.
- Leaky return plenums drawing basement air. In tighter 1980s and 1990s Colonials, the return air plenum often runs through a basement utility room. Gaps here create negative pressure that pulls musty basement air, radon, or even fumes from attached garages into the living space, a problem that worsens when the house is buttoned up for winter.
- Commercial rooftop unit leaks from tenant fit-out debris. The office buildings along Route 9 and I-495 frequently show leaks at rooftop unit connections and main trunk transitions, sometimes caused by vibration from construction during tenant improvements. We find sheet-metal screws backed out and access panels never properly resealed.
Pricing for Duct Sealing in Westborough, MA
Honest pricing starts with honest ranges. In Westborough, residential duct sealing typically costs $800 – $1,800 for a whole-house system, with smaller spot repairs or single-zone work starting around $350. Commercial systems in the Route 9 corridor generally run $1,500 – $4,500 depending on access, system size, and whether we need after-hours scheduling. What moves the number: how much ductwork you have, whether it’s accessible from basement and attic or requires cutting into finished ceilings, and the condition of existing materials (rusted galvanized takes longer to prep than sound flex duct).
We do not quote per-vent teaser prices that balloon once we’re inside. The price is written down before any work starts, and it does not move at the door. Every estimate is free, and we show you the test results that justify the scope. Call (361) 326-5060 to schedule yours.
We Also Serve Cities Near Westborough
Our crews seal ducts throughout the I-495 corridor, including Northborough, Marlborough, Milford, and Hudson. Each community has its own housing stock and duct challenges, from Marlborough’s converted mill buildings to Hudson’s post-war Cape neighborhoods. If you’re searching for Duct Sealing in Westborough or nearby, the same crew, equipment, and written guarantee travel with us. We also handle Air Duct Cleaning in Westborough and Dryer Vent Cleaning in Westborough for homeowners who want their full system addressed in one visit.
Serving Westborough, MA - Our Local Coverage Area
We’re based in the Westborough area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Duct Sealing in Westborough
We typically schedule Westborough appointments within three to five business days, with some flexibility for urgent situations like a disconnected trunk line in heating season. Call (361) 326-5060 to check current availability, estimates are free.
Yes, we seal ducts from the center-chimney Colonials near the Town Common to the Chauncy Lake subdivisions and the Route 9 office parks. Historic homes often require more careful access planning to preserve plaster and trim, but we’ve worked in timber-frame houses throughout Westborough.
We handle urgent calls where a failed heating system is tied to duct damage, though most sealing work is scheduled in advance. Our phones are answered by a live person 24 hours a day, seven days a week, so you can always reach us to discuss timing.
Westborough pricing is comparable to Northborough and Marlborough, though historic homes near the Town Common sometimes cost more if access requires working around original plaster or tight chimney chases. We give you a written price before any work starts, so there are no surprises.
Every seal is covered by our 365-Day Done Right Promise. If any sealed joint fails within a full year, we return and make it right at no charge, including a free second visit. That’s backed in writing on every job, not a verbal assurance.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Westborough and the greater Boston metro since 2004.