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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AfterFast, Reliable Duct Sealing Across Wellesley
We seal ducts in Wellesley homes where the real problem isn’t dirty vents, it’s air bleeding into wall cavities through joints that were never properly closed. Our Duct Sealing in Wellesley crews work from the Boston office and cover the full town, from Cottage Street estates to post-war capes near Route 9. Most jobs are scheduled within a week, and we arrive inside the quoted window because The Garrison Standard doesn’t allow “between 8 and 5” vagueness. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Wellesley’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our reputation in Wellesley is built on showing up and doing what we said we’d do. Wellesley homeowners leave reviews mentioning the same things: technicians who explain the camera footage before quoting, written prices that hold at the door, and the 365-Day Done Right Promise that actually gets honored when a callback happens.
Our response time to Wellesley is typically three to five business days for standard duct sealing, with scheduling coordinated from our Boston office. We know the local housing stock: pre-1950 colonials with balloon-frame construction, Tudors with finished basements hiding retrofitted ductwork, and mid-century ranches where attic flex runs have sagged or disconnected. That local knowledge means we bring the right access tools and don’t waste your time with a generic approach.
Every technician is background-checked and uniformed. You know who’s arriving before they walk in. And phones are answered by a live person 24 hours a day, 7 days a week, no voicemail loops.
Air Duct Sealing in Wellesley
Air Duct Sealing in Wellesley is the process of closing leaks, gaps, and disconnected joints in your HVAC system’s distribution network so conditioned air reaches the rooms it’s supposed to reach instead of dissipating inside walls, attics, or crawl spaces. In Wellesley, this work is especially critical because so many homes contain original gravity-fed duct runs from early heating systems, later tied into modern forced-air furnaces without proper sealing at the transition points.
A typical Air Duct Sealing job in Wellesley runs $800 – $1,800 for a whole-house seal, depending on system accessibility and whether we find disconnected or crushed sections that need reconnection first. Homes with finished basements or sealed attics take longer to access, which affects labor time. We write the price down before any work starts, and it does not move.
Sealing Original Gravity-Fed Ducts
Many Wellesley homes, particularly in the Cottage Street area, retain oversized rectangular chases from coal or oil furnace days. These were never designed for forced air. We seal them with mastic and mesh reinforcement, not tape, because tape fails within a season on metal that expands and contracts through our freeze-thaw cycles.
Post-Cleaning Sealing Protocol
We often find that sealing alone isn’t enough until source removal is complete. If your ducts contain decades of accumulation, we clean first with Rotobrush rotary systems and Nikro negative-air machines, then seal. Sealant applied over debris peels. We do it in the right order.
Duct Sealing Services in Wellesley
Duct Sealing Services in Wellesley from Hollis address the specific failure patterns we see in this town’s housing stock: disconnected flex runs hidden behind plaster, rusted seams in attic trunks from condensation, and unsealed transitions where old gravity chases meet new equipment. Our Duct Sealing team treats each system as a custom job because Wellesley’s mix of historic and mid-century construction doesn’t allow for templated solutions.
Whole-system Duct Sealing Services in Wellesley typically range from $800 – $1,800, with most falling between $1,100 – $1,400 for a three- to four-bedroom home. If we discover crushed or disconnected ductwork during inspection, reconnection adds $200 – $500 depending on access difficulty. We always photograph the condition, show you before we quote, and get written approval.
Blower-Door Verification
After sealing, we verify results. Our crew runs a blower-door test to measure static pressure improvement and checks room-to-room airflow balance. You see the numbers. In a 1920s Tudor near Cottage Street, this process revealed that sealing dropped static pressure enough to finally deliver heat to a previously cold second floor.
Mastic vs. Tape: What We Use and Why
We use water-based duct mastic with embedded mesh tape on metal joints, not foil tape alone. Mastic remains flexible through temperature swings and won’t degrade from the microbial growth we sometimes find in Wellesley’s humid summer attics. It’s slower to apply. It lasts.
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 Wellesley
Our equipment roster includes Rotobrush rotary brush systems for agitation and debris removal, Nikro negative-air machines for containment during cleaning, and sealing products from Abatement Technologies and Guardsman. We don’t use hardware-store tape or consumer-grade sealants. For filtration upgrades paired with sealing work, we stock Honeywell and Aprilaire products. Parts are held at our Boston office, so if your sealed system needs a component replacement, turnaround is fast and we don’t make you wait for a drop-ship from a warehouse two states away.
Common Duct Sealing Problems We See in Wellesley Homes
- Original gravity-fed runs leaking into balloon-frame walls. In pre-1950 Wellesley homes, especially near Cottage Street, oversized chases from early heating systems were later connected to modern furnaces without sealing the joints. Conditioned air bleeds directly into wall cavities, which standard tape cannot fix.
- Crushed or disconnected flex ducts in finished basements. Retrofitted ductwork routed through 1970s and 1980s basement renovations often sits hidden behind drywall. We find sections flattened by storage items or completely detached at the collar, dumping air into ceiling bays.
- Rusted seams from attic condensation. Wellesley’s freeze-thaw cycles create moisture in unconditioned attics. Metal duct seams corrode, and sealant applied over rust without surface preparation fails within months. We address the rust first.
- Microbial growth compromising sealant adhesion. Humid summers in Wellesley promote mold and mildew inside duct trunks. Sealing over active growth is temporary. Our protocol includes source removal and treatment before mastic application.
Pricing for Duct Sealing in Wellesley, MA
Duct sealing in Wellesley typically costs $800 – $1,800 for a complete residential system. Most three- to four-bedroom homes fall in the $1,100 – $1,400 range. What moves the number: accessibility (finished basements and sealed attics add labor time), the condition of existing ductwork (crushed or disconnected sections need reconnection before sealing), and whether source removal is required first.
We do not quote per-vent prices. We do not offer teaser coupons that balloon once the van is in your driveway. We inspect with a camera, show you what we found, and write one flat price per system before any work starts. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Wellesley
Our crews regularly work in Needham, Framingham, Newton, and Medfield. Each town has different housing stock and different duct problems, but the same standard applies: written price, written guarantee, job done by the book.
Serving Wellesley, MA - Our Local Coverage Area
We’re based in the Wellesley 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 Wellesley
Wellesley’s pre-1950 homes often contain original gravity-fed duct runs that were retrofitted to forced-air systems without proper sealing at transition points, so conditioned air leaks into balloon-frame wall cavities rather than reaching rooms. This pattern is rare in neighboring towns with newer construction, making sealing here a more specialized job. Call (361) 326-5060 for a free inspection and written estimate.
Yes, but we first inspect with a camera to locate disconnected or crushed flex sections hidden behind drywall or insulation, which sealing alone won’t fix. In Wellesley’s finished basements, we often find 1980s retrofits that need reconnection before mastic application. We show you the footage, quote the full scope in writing, and proceed only with your approval.
Wellesley’s cold winters and humid summers mean HVAC systems run heavily year-round, accelerating expansion and contraction in metal ducts that can break sealant bonds. Freeze-thaw cycles in unconditioned attics also cause condensation that rusts seams and promotes microbial growth, both of which must be addressed before sealing for the work to last. Our protocol accounts for these conditions.
Yes, our source removal and sealing protocols align with NADCA guidelines, including containment with negative-air machines during cleaning and verification of seal integrity after application. We use professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, not consumer-grade tools. The 365-Day Done Right Promise covers our sealing work in writing.
We use mastic and mesh systems from Abatement Technologies and Guardsman, applied after source removal with Rotobrush rotary systems and Nikro negative-air machines. For filtration upgrades coordinated with sealing, we install Honeywell and Aprilaire products. Everything is professional-grade, explained in plain terms on every job. Call (361) 326-5060 to discuss your system.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Wellesley since 2004.