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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Before
AfterFast, Reliable Duct Sealing Across Brookline
Brookline homeowners dealing with uneven heat, dusty rooms, or rising energy bills usually have one thing in common: leaky ductwork pulling air from the wrong places. We dispatch our crews to Brookline from our Boston office, and we know the local streets well enough to park a van on Beacon or Harvard without blocking the tight traffic patterns that frustrate out-of-town contractors. If your registers barely blow on the third floor while the first floor roasts, or if your basement smells find their way upstairs, duct sealing is likely the fix. Call us at (361) 326-5060 for a free estimate and written price before any work starts.
Why Hollis Air Duct Cleaning Is Brookline’s Preferred Duct Sealing Company
We’ve been working in Brookline long enough to recognize the building patterns before we walk through the door. The Victorians near Coolidge Corner, the brick Colonials along Washington Street, the converted two-families off Route 9 – our technicians have sealed ducts in all of them. We show up in uniform, background-checked, and on time, because The Garrison Standard doesn’t allow excuses. Every Brookline job gets a written price before we touch anything, and every repair is covered by our 365-Day Done Right Promise: if the work fails within a year, we come back and make it right at no charge, including a free second visit. Our phones are answered by a live person 24 hours a day, 7 days a week, so you’re not waiting through a callback queue while your heat bleeds into an unsealed attic.
Air Duct Sealing in Brookline
Air Duct Sealing in Brookline means closing the gaps, cracks, and failed joints in your forced-air system so heated or cooled air reaches the rooms it was meant for instead of leaking into walls, attics, or crawlspaces. In this market, a typical whole-house duct sealing job runs $1,200 – $2,800 depending on system size, access difficulty, and whether we use manual mastic sealing or Aeroseal aerosol-based sealing for hard-to-reach runs.
Supply Duct Leaks in Attic Kneewalls
Brookline’s retrofitted flex ducts often run through unheated attic kneewalls where temperature swings degrade tape and loosen joints. We seal these with mastic and mesh reinforcement, or apply Aeroseal when the ducts are buried behind finished walls. The goal is simple: the air you paid to heat should stay in the ducts until it exits your register.
Return Side Sealing in Basement Coal Rooms
Here’s what generic duct sealing pages won’t tell you. In Brookline’s two- and three-family Victorians, the retrofit furnace often sits in the old coal room, and its open return plenum pulls basement air – including stored paint thinners and musty odors – straight into the duct system, a pattern technicians see from Coolidge Corner to Washington Square. Duct sealing here must therefore address the return side and basement air quality, not just supply leaks. We seal the plenum, filter the intake, and verify that what’s entering your return is clean conditioned air, not whatever’s fermenting downstairs.
Duct Sealing Services in Brookline
Duct Sealing Services in Brookline cover everything from spot repairs on accessible joints to whole-system sealing for homes with ducts routed through plaster walls, panned joist returns, and shared chases in multi-unit buildings. Most Brookline homeowners call us after noticing cold rooms on upper floors, dust that returns quickly after cleaning, or energy bills that climbed without explanation. A typical partial sealing job for a single problem zone starts around $450 – $750, while comprehensive sealing for a full system in a larger Victorian or multi-unit building runs $1,800 – $2,800.
Aeroseal for Inaccessible Duct Runs
When ducts are buried behind original plaster and lath, we use Aeroseal technology to inject polymer particles that seal leaks from the inside. The process pressurizes the duct system, measures leakage before and after, and provides a printed report showing exactly how much we closed. Brookline homeowners with historic interiors prefer this because we don’t open walls.
Mastic and Mesh for Accessible Joints
For basement and utility room access points, we apply water-based duct mastic reinforced with fiberglass mesh. This outlasts foil tape by years, especially in Brookline’s humid basements where tape adhesive fails. We price this work by the linear foot or by system zone, always in writing before we start.
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 Brookline
Our crews carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, the same tools commercial HVAC contractors use on larger buildings. For filtration and air quality components tied to sealing jobs, we stock Honeywell, Aprilaire, and Guardsman products. We keep common fittings and sealants on our Brookline vans so we’re not driving back to a warehouse while your job sits half-finished. When a three-family on Harvard Street needs a sealed return plenum and upgraded filtration, we have the parts to complete it in one visit.
Common Duct Sealing Problems We See in Brookline Homes
- Open return plenums in basement coal rooms. The old coal chute or storage room where the retrofit furnace sits often has an unsealed return that draws basement air directly into the duct system. We seal the plenum and verify filtration so soil gases, odors, and moisture don’t circulate through every room.
- Flex duct degradation in attic kneewalls. Brookline’s unheated attics freeze in winter and bake in summer, causing flex duct tape to fail and joints to separate. We replace failed tape with mastic and mesh, or recommend Aeroseal when access is impossible without damaging historic finishes.
- Undersized ductwork from forced-air retrofits. Original gravity furnace systems were replaced with blowers too powerful for the existing duct diameter, creating backpressure that blows seals and strains motors. Sealing alone won’t fix this; we identify when duct resizing is the real solution.
- Shared dryer vent stacks in multi-unit buildings. Many Brookline two- and three-families vent dryers through a common stack that accumulates lint and creates fire hazards. Duct sealing improves airflow, but the dryer vent itself may need separate cleaning or rerouting to be safe.
Pricing for Duct Sealing in Brookline, MA
Honest pricing means no per-vent teaser rates that balloon once we’re inside. A typical duct sealing job in Brookline runs $1,200 – $2,800 for a whole system, with smaller spot repairs at $450 – $750. What moves the price: system size (a single-family Colonial versus a three-family Victorian), access difficulty (finished basements versus open utility rooms), sealing method (manual mastic versus Aeroseal technology), and whether we find underlying problems like undersized ducts or contaminated return plenums that need addressing first. We inspect, measure leakage, and give you a written price before any work begins. That price does not move at the door. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Brookline
Our crews work throughout the metro area, and we regularly schedule Duct Sealing in Brookline alongside jobs in Newton, Cambridge, Boston, and Somerville. Dispatch and scheduling are coordinated from our Boston office, but the technicians who arrive at your Brookline door know these neighborhoods and building types from experience, not GPS.
Serving Brookline, MA - Our Local Coverage Area
We’re based in the Brookline 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 Brookline
Yes, duct sealing often resolves cold rooms by closing leaks that bleed heated air into walls or attics before it reaches upper-floor registers. In Brookline’s Victorians, we also check whether the ductwork was properly sized for the retrofit furnace, because undersized supply runs can’t push enough air regardless of sealing. Call (361) 326-5060 and we’ll inspect both the leaks and the system design.
We coordinate with building owners or property managers to access common utility areas, basement coal rooms, and shared mechanical chases. Our technicians carry identification and background checks, and we schedule around tenant availability when needed. We seal the work area with drop cloths and leave it clean, because The Garrison Code requires it.
Duct sealing improves air quality by preventing the system from pulling basement air, attic dust, or crawlspace moisture into your living spaces. In Brookline’s pre-war buildings with open return plenums in former coal rooms, this is often the single biggest air quality improvement available. We verify our work with before-and-after leakage tests so you can see the difference.
Duct sealing improves overall airflow but does not clean or replace a clogged dryer vent. In Brookline condos with shared dryer stacks, lint accumulation is a separate fire hazard that requires dedicated dryer vent cleaning. We inspect both systems and can address them in the same visit, priced separately and in writing.
We use Rotobrush rotary systems for mechanical cleaning prep, Nikro negative-air machines for containment during work, and Abatement Technologies filtration when air quality is compromised. For sealing technology, we apply manual mastic and mesh or Aeroseal aerosol injection depending on access and leak location. Every tool is professional-grade, not hardware-store gear.
We were called to a three-family on Harvard Street near Coolidge Corner where the second-floor tenants complained of cold rooms and dust. Our camera inspection revealed a panned joist return in the basement coal room drawing air from a damp crawlspace, and flex runs in the attic kneewalls leaking at every joint. We sealed the return plenum with mastic and mesh, then used Aeroseal to seal the supply ducts, restoring balanced airflow to the third-floor registers.
Ready to stop heating your attic and start heating your home? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll inspect your Brookline system, measure the leakage, and give you a written price before any work begins. Every job is backed by our 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Brookline and the greater Boston area.