Fast, Reliable Duct Repair & Sealing Across Greenwich
Duct repair and sealing in Greenwich, CT typically runs $280-$650 for most residential jobs, with back-country estates running higher due to multiple air handlers. Our Duct Repair & Sealing team reaches Greenwich within 45 minutes to an hour from our dispatch point, and we carry the parts to finish most repairs same-day. We’ve worked the full stretch of this town, from the tight attic runs of 1920s colonials near Putnam Avenue to the sprawling mechanical rooms of estates off North Street in 06831.
Greenwich’s housing doesn’t forgive shortcuts. Downtown Tudors and Victorians in 06830 have ductwork wedged around original steam pipes with clearance measured in inches. Back-country homes in 06831 pack five, six, sometimes eight separate air handlers into a single property. Both demand technicians who’ve seen the specific failure patterns this town produces, not generalists working off a template. When you call (844) 685-6342, a live person answers - 24 hours a day, no voicemail, no app.
Why Bellows Air Duct & Vent Co. Is Greenwich’s Preferred Duct Repair & Sealing Company
We’ve been serving Connecticut homeowners since 1984, and Greenwich has been central to our route book for decades. Ray Castillo, our owner, built this company on the principle that the price quoted on the phone matches the price on the invoice - no bait coupons, no changes at the door. That matters especially in Greenwich, where we’ve seen too many homeowners in Riverside and Old Greenwich burned by low bids that ballooned once the truck arrived.
Our reviews from Greenwich customers consistently mention two things: we show up when we say we will, and we document everything. Every duct repair includes camera inspection before and after work begins. You see what we see - the cracked flex duct, the separated plenum, the biofilm coating the liner. No claims without proof.
Response time to Greenwich averages under an hour for standard calls, and we maintain emergency capacity for homes with disabled HVAC systems during peak summer or winter loads. Our technicians are background-checked, uniformed, and carry identification - important for estate properties with security protocols and gated access in back-country Greenwich.
We know the local codes. We know which Greenwich neighborhoods have homes with asbestos-wrapped ductwork from mid-century renovations. We know that 06836 covers the Glenville section, where split-levels from the 1960s have their own duct quirks. This isn’t theoretical knowledge. It’s accumulated from thousands of jobs in this specific market.
Our Duct Repair & Sealing Services in Greenwich
Duct Sealing
Leaky ducts waste 20-30% of conditioned air in a typical Greenwich home before it reaches the rooms you actually use. Our sealing work targets the joints, plenums, and connections where air escapes - using mastic sealant and professional-grade tapes rated for the temperature swings these systems endure. In Greenwich’s older downtown housing stock, we regularly seal mixed-material plenums where galvanized steel meets flex duct, often installed during hasty conversions from steam heat. The 90-Day Done Right Promise applies to every sealing job: if air loss persists, we return at no charge, no paperwork required.
Flex Duct Repair
Flex duct fails at the connections. In Greenwich’s tight attic spaces - especially the shallow rooflines of colonials near Milbank Avenue - flex gets crushed, kinked, or pulled loose by thermal expansion and contraction. We replace damaged sections with new insulated flex, secure with mechanical fasteners rather than tape alone, and restore proper support spacing so the duct doesn’t sag and collect condensation. Cold, damp winters in Greenwich make this critical. A sagging flex duct in an under-insulated attic will pool condensate, grow mold, and fail again within a season if not addressed correctly the first time.
Metal Duct Repair
Galvanized steel ductwork in Greenwich’s pre-war homes and mid-century builds develops rust at seams, separation at drive cleats, and holes from decades of contact with corroding support straps. We patch small breaches with sheet metal and sealant, replace rotted sections with matching gauge material, and reinforce structural supports. Metal repair demands precision - too much sealant restricts airflow, too little leaks. Our technicians measure static pressure before and after repair to verify the fix.
Air Leak Repair
Air leaks in duct systems don’t just waste money. In Greenwich’s humid climate, they pull unconditioned, moisture-laden air into the system, accelerating biofilm growth on duct liners and evaporator coils. We pressurize the system, identify leak points with smoke testing or theatrical fog, and seal them methodically. This is especially important in back-country estates where guest wings and finished basements may go days without airflow, allowing moisture to stagnate. We recently sealed leaking flex ducts in a Tudor home near downtown Greenwich (06830) where the original steam system had been retrofitted with forced-air ductwork; using Rotobrush tools and mastic sealant, we patched mixed-material plenums that were losing 30% of airflow.
Duct Insulation
Uninsulated or poorly insulated duct runs in Greenwich attics and crawl spaces bleed heat in winter and gain it in summer. We install foil-faced fiberglass insulation or closed-cell foam wrap depending on clearance constraints and local code requirements. Proper insulation also prevents surface condensation - a major contributor to mold in Greenwich’s high-dew-point summers.
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 Greenwich
We stock parts and specify equipment from Abatement Technologies, Rotobrush, and Aprilaire - the same brands serious HVAC contractors use when they’re installing systems meant to last. For Greenwich customers, this means faster turnaround. When we encounter a failed component on a repair call, we typically have the replacement on the truck or can source it within 24 hours. No waiting on drop-shipped parts from a warehouse three states away. Our mastic sealants and duct liners come from manufacturers who rate their products for the humidity and temperature cycling these Connecticut systems endure.
Common Duct Repair & Sealing Problems We See in Greenwich Homes
- Underbidding on multi-system estates. Crews that quote per home instead of per air handler routinely underestimate back-country jobs in 06831. A property with six or eight handlers requires individual access, brushing, and sealing for each unit. Rushed repairs leave leaks that degrade air quality and system efficiency within months.
- Mold regrowth after incomplete cleaning. Greenwich’s persistent summer humidity from Long Island Sound creates ideal conditions for biofilm on duct liner surfaces. Sealing over contaminated liners traps moisture and guarantees regrowth. We clean thoroughly before sealing - camera-verified, documented.
- Failed flex duct connections in tight attic runs. Older colonials near downtown Greenwich have shallow attics with insulation gaps that expose flex duct to temperature extremes. The material fatigues at connections, separates, and leaks conditioned air into unused spaces.
- Condensation in uninsulated attic runs. Cold, damp winters hit Greenwich hard. Attic ductwork without adequate insulation sweats, drips onto ceilings, and promotes mold in wall cavities. We see this pattern repeatedly in the 1920s-1950s housing stock near Greenwich Avenue.
Pricing for Duct Repair & Sealing in Greenwich, CT
Most residential duct sealing and repair jobs in Greenwich fall between $280 and $650. Here’s how typical work breaks down:
- Single-zone duct sealing (mastic, tape, smoke-test verification): $280-$420
- Flex duct repair or replacement (per run, including insulation): $180-$340
- Metal duct patch or section replacement: $220-$480
- Multi-system estate sealing (per air handler): $340-$650 per unit
- Duct insulation addition or replacement (per linear foot): $8-$14
Back-country estates in 06831 with five or more independent HVAC systems require per-air-handler quoting. A full-property seal on these homes can run $1,700-$3,900 depending on access difficulty and liner condition. What drives cost: number of air handlers, accessibility (crawl space vs. finished basement), extent of biofilm contamination requiring pre-cleaning, and whether original ductwork was retrofitted around steam or radiator systems.
We disclose all pricing before work begins. The number we give on the phone is the number on the invoice. We also honor our standing offers: $50 off any repair over $250, free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Call (844) 685-6342 for a free estimate - we’ll ask the right questions about your system and give you a real number, not a range designed to get a foot in the door.
We Also Serve Cities Near Greenwich
Our service radius covers Greenwich and the surrounding communities - Cos Cob, Riverside, Old Greenwich, and Stamford. Each has its own housing patterns and duct challenges, from Stamford’s high-rise conversions to the waterfront homes of Old Greenwich where salt air affects outdoor condensers and indoor ductwork alike. Wherever you are in this corridor, the same standards apply: upfront pricing, camera verification, and the 90-Day Done Right Promise in writing.
Serving Greenwich, CT - Our Local Coverage Area
We’re based in the Greenwich 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 Greenwich
We quote and schedule by the air handler, not by the home. A typical back-country estate in 06831 has five to eight independent systems, and each requires individual access, inspection, brushing, sealing, and verification. Rushing this work or treating it as a standard single-family job guarantees missed leaks and callbacks. We allocate full days or multiple days for these properties, with the same technician team throughout. Call (844) 685-6342 to schedule an on-site assessment - estimates are free.
Summer humidity from Long Island Sound keeps dew points elevated through late spring and early fall, creating condensation on duct surfaces that weren’t properly sealed or insulated. If biofilm wasn’t thoroughly removed before sealing, trapped moisture feeds regrowth that degrades the repair. We see this pattern in 06830’s older homes where previous contractors sealed over contaminated liners. Our process includes pre-cleaning and camera verification before any sealant application.
Yes. We’ve worked extensively in the Tudors and colonials near downtown Greenwich where forced-air ductwork was installed around original steam or hot-water radiator systems. These retrofits create irregular runs, mixed-material plenums, and tight clearances that demand patience and specialized tools. We use Rotobrush equipment and mastic sealant to navigate these constraints, and we document every repair with before-and-after camera footage.
A full-day repair on a multi-system Greenwich estate typically covers two to three air handlers completely - inspection, cleaning, sealing, and verification. Properties with six or more handlers require two or more days. We don’t rush to hit a schedule; we quote the time the job actually needs. The 90-Day Done Right Promise backs every day of work.
We don’t install or service rolling-code access systems for duct panels - that’s outside our scope. For standard mechanical access panels in Greenwich townhomes and multi-family buildings, we work with building maintenance to coordinate entry and ensure security protocols are followed. Our technicians carry identification and background-check documentation for properties with access controls. If your building has specialized entry requirements, mention them when you call (844) 685-6342 so we can plan accordingly.
Ready to stop losing conditioned air and start getting what you pay for on your utility bills? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate on duct repair and sealing in Greenwich. We’ll give you one honest price, show up when we say, and stand behind the work for 90 days - in writing, no arguing, no paperwork if something needs adjustment. That’s how we’ve operated since 1984.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Greenwich since 1984.