Fast, Reliable Duct Repair & Sealing Across Brooklyn
Duct repair and sealing in Brooklyn typically costs $280-$650 for most residential jobs, with same-day or next-day service available throughout the borough. We handle the retrofitted systems found in pre-war brownstones, row houses, and converted walkups - the kind of ductwork that was never part of the original building design.
We’re Bellows Air Duct & Vent Co. of New York, and we’ve been working in Brooklyn since 1984. Our technicians know the difference between a Park Slope brownstone with plaster-and-lath walls and a Bay Ridge brick attached home with a basement air handler. We answer our phones live, 24 hours a day, at (833) 348-8789. Most repairs are finished in a single visit, and we show you the price before we pick up a single tool.
Why Bellows Air Duct & Vent Co. of New York Is Brooklyn’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Brooklyn on showing up when we say we will and fixing what we said we’d fix. Our Duct Repair & Sealing in Brooklyn work is backed by our 90-Day Done Right Promise - if it’s not right, we make it right, no paperwork, no arguing. That promise is stamped on every job, and it’s why homeowners in Flatbush, Park Slope, and Kensington call us back when something else goes wrong.
Our response time to Brooklyn is same-day or next-day for standard calls, and we carry the parts and materials to complete most repairs without ordering and returning. Every technician is background-checked and uniformed, and every job starts with a camera inspection so you see what we see - not just take our word for it.
We understand the local building stock. Brownstones in Crown Heights, converted walkups in Bushwick, post-war brick homes in Bay Ridge (11209) - each presents different duct access challenges, and we’ve worked in all of them. Lou Ferrante has led this company since its founding, and he still reviews complaint calls personally to make sure we’re holding up our end.
Our Duct Repair & Sealing Services in Brooklyn
Duct Sealing
Most Brooklyn homes lose 20-30% of conditioned air through leaks before it ever reaches the vents. In brownstone retrofits, the problem is worse - ductwork routed through original plaster walls and floor cavities develops gaps at joints that were never properly sealed during installation. Our crew uses professional-grade mastic sealant and metal-backed tape, not the cheap foil tape that peels off in humid basements. We pressurize the system and verify results with a camera so you know the seal held.
Flex Duct Repair
Flex duct is common in Brooklyn retrofits because it bends around obstacles that rigid metal can’t navigate. That flexibility becomes a liability. Sharp bends over time collapse the inner liner, creating debris traps and airflow dead zones. In subdivided brownstones, we’ve found flex sections crushed between joists or pinched by hastily installed access panels. We replace damaged runs with properly supported flex duct or transition to metal where space allows - whichever solves the problem for the long term.
Metal Duct Repair
Original metal trunk lines in Brooklyn’s converted multi-family buildings often date to the first HVAC retrofit, sometimes decades ago. Seams separate, hangers corrode in damp basements, and field-fabricated connections leak at every joint. We re-seam metal duct with proper drives and slips, replace rusted sections with galvanized stock, and seal with mastic rated for the application. In buildings where ducts connect across units - a shortcut we see in flipped properties - we isolate and properly cap cross-connections so you’re not heating your neighbor’s apartment.
Duct Insulation
Brooklyn’s three-sided water exposure drives higher humidity than inland markets, and uninsulated ductwork in basements and crawl spaces sweats condensation that breeds mold. We wrap supply ducts with formaldehyde-free fiberglass insulation, sealed at seams, to maintain air temperature and prevent surface condensation. In garden-level apartments with air handlers tucked into damp corners, proper insulation combined with mold-inhibiting sealant is often the difference between a system that lasts and one that needs rework within a season.
What happens when you call
- 1
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 Brooklyn
We stock parts and materials from Honeywell, Aprilaire, and Abatement Technologies - the same brands serious HVAC contractors specify, not the generic hardware-store stock that fails early. For Brooklyn customers, that means faster turnaround. We’re not waiting on a shipment to fix your system. Our trucks carry mastic sealant, metal duct stock, flex duct in common diameters, and insulation so most jobs finish in the first visit. If your system uses specialized components, we’ll tell you before we start whether we need to source anything, and we’ll give you the timeline upfront - no surprises on the bill.
Common Duct Repair & Sealing Problems We See in Brooklyn Homes
- Retrofit ductwork in plaster walls with sharp bends and crushed flex sections. Original brownstone construction never anticipated forced air, so ducts get routed through whatever cavity is available. Over years, flex duct collapses at tight turns, cutting airflow to distant rooms and trapping construction debris from the original retrofit.
- Quick-flip renovations connecting ducts across units without proper sealing. In gentrifying corridors like Bushwick and East New York, we’ve found systems where a flipped unit ties into an adjacent apartment’s trunk line with field-fabricated mastic joints. The result is inter-unit air leaks, pressure imbalances, and utility bills that don’t match actual usage.
- Mastic failure in damp below-grade basements and garden apartments. Brooklyn’s persistent humidity attacks standard duct sealant. Joints that looked fine in dry October fail by the following July. We re-apply with mold-inhibiting sealant rated for high-moisture environments.
- Construction debris and lead-paint dust accumulation in irregular duct runs. Ductwork installed through century-old plaster walls carries plaster fragments and, in pre-1978 buildings, disturbed lead-paint particles. These accumulate in dead-end sections and bends that standard cleaning equipment can’t reach, requiring targeted access and removal.
Pricing for Duct Repair & Sealing in Brooklyn, NY
Here’s what duct repair and sealing costs in Brooklyn’s market:
| Service | Typical Range |
|---|---|
| Basic duct sealing (single system, accessible joints) | $280-$420 |
| Flex duct repair or replacement (per run) | $180-$340 |
| Metal duct repair (seam re-sealing, section replacement) | $320-$550 |
| Duct insulation (per linear foot, materials and labor) | $12-$18 |
| Mastic re-application with mold inhibitor (damp environments) | $260-$400 |
| Air leak detection and targeted repair | $240-$380 |
What moves the price: accessibility (working through original plaster versus exposed basement runs), extent of damage, whether we need to cut access panels, and material type. We inspect with a camera first, show you exactly what we found, and give you the full price before we start. Estimates are free. Call (833) 348-8789 to schedule.
Standing offers: $50 Off Any Repair Over $250; Free Second Opinion on Any Written Estimate; permanent 5% Senior and Veteran discount.
We Also Serve Cities Near Brooklyn
Our Duct Repair & Sealing team works throughout the borough and into Flatbush, Park Slope, Kensington, and East Flatbush. Same trucks, same technicians, same upfront pricing. Whether you’re in a 1920s brick row house or a converted walkup near Prospect Park, we know the building type and we know how to fix it.
Serving Brooklyn, NY - Our Local Coverage Area
We’re based in the Brooklyn 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 - Duct Repair & Sealing in Brooklyn
Yes, in most cases we can seal ductwork through existing registers, basement access points, or small strategic openings that we patch and match afterward. We use camera inspection to map the system first, so we know exactly where the leaks are before we cut anything. For the rare run that’s completely sealed inside a wall with no other access, we’ll show you the camera footage and discuss options - but most brownstone retrofits have enough basement or floor-cavity access to avoid major plaster demolition. Call (833) 348-8789 for a free inspection and exact quote.
Brooklyn’s persistent humidity - especially near waterways like the Gowanus Canal - causes standard mastic sealant to soften and fail within months, and promotes mold growth on damp duct surfaces. We use mold-inhibiting sealant rated for high-moisture environments, and we verify that basement air handlers have adequate drainage and clearance. The combination of proper sealant selection and moisture control at the source is what makes the repair last. Call (833) 348-8789 to schedule an inspection of your specific conditions.
Yes, this is one of the most common calls we get in flipped units. Quick renovations often connect new duct runs to existing systems with improper sealing, or leave flex duct crushed behind drywall. The result is pressure imbalance - too much air to one room, not enough to another. We pressurize the system, locate the leaks with camera verification, and re-seal or reroute as needed. We recently sealed a flex duct run in a subdivided brownstone on Jefferson Avenue in Bushwick (11206) where a flipped unit’s system tied into an adjacent apartment’s metal trunk line via field-fabricated mastic joints - our crew had to cut access panels through century-old lath to reach and re-seal four leaking connections that were dumping conditioned air into a sealed cavity. Call (833) 348-8789 for a free second opinion on any written estimate you’ve received.
Yes. Suburban systems are typically purpose-built with straight runs, proper hangers, and factory seams. Brownstone retrofits use field-fabricated connections, improvised supports, and metal stock that may be decades old. We re-seam with drives and slips rather than relying on tape alone, replace corroded sections with matching galvanized stock, and use heavier mastic application at joints that vibrate or flex. The goal is a repair that lasts in conditions the original installer never anticipated. Call (833) 348-8789 to discuss your specific system.
We access from below through the basement ceiling, or from above through strategically placed floor registers, using extension tools and camera guidance to reach joints that aren’t directly accessible. In some Park Slope buildings, we’ve found that the original floor-cavity runs were never properly sealed at all - just butted together and covered with subfloor. We seal what we can reach, replace what we can’t, and always verify with a camera that the repair held. If your basement is damp, we also address moisture control to protect the new sealant. Call (833) 348-8789 for a free estimate - we’ll show you exactly what we’re working with before we quote.
Ready to fix the leaks in your Brooklyn ductwork? Call Bellows Air Duct & Vent Co. of New York at (833) 348-8789 for a free estimate. We’ll inspect with a camera, show you the price before we start, and back our work with the 90-Day Done Right Promise - in writing, no arguing. Same-day and next-day appointments available throughout Brooklyn, from Bay Ridge to Bushwick.
Written by Lou Ferrante, Owner at Bellows Air Duct & Vent Co. of New York, serving Brooklyn since 1984.