Fast, Reliable Duct Repair & Sealing Across Chicago
Duct repair and sealing in Chicago typically costs $180-$650 depending on accessibility and material type, with most repairs completed in a single visit. Bellows Air Duct & Vent Co. has served Chicago homeowners since 2012, and our Duct Repair & Sealing team understands the cramped crawl spaces and aging retrofit ductwork that make this city’s jobs different from anywhere else. Call (877) 502-3903 for upfront pricing and a free estimate - we’ll be there when we say.
We’ve worked on duct systems from Bridgeport bungalows to Lakeview greystones, and the problems we find in Chicago aren’t the same as what a suburban technician sees. The housing stock here is older, the retrofits were often improvised, and the lake-effect climate pushes HVAC systems harder than in milder regions. That combination means duct repairs here require specific knowledge, specific tools, and patience that can’t be rushed.
Why Bellows Air Duct & Vent Co. of Chicago Is Chicago’s Preferred Duct Repair & Sealing Company
Ray Dempsey has led Bellows Air Duct & Vent Co. for decades, building a reputation in Chicago on one principle: do the job right, show the homeowner proof, and stand behind it. Our 90-Day Done Right Promise is stamped on every job in writing - if it’s not right, we make it right, no paperwork, no arguing. That’s not a slogan; it’s how we’ve operated since 2012.
Chicago customers call us because we answer the phone. Not an app, not a voicemail - a live person, 24 hours a day. Our background-checked, uniformed technicians arrive with camera inspection equipment to show you exactly what’s happening inside your ducts before a single tool is lifted. Most jobs finish in one visit, and the price we quote on the phone is the price on the invoice.
We know Chicago’s neighborhoods because we’ve driven them for over 42 years. From the bungalow blocks of Archer Heights to the two-flats of Douglas and the courtyard buildings of the Near South Side, we’ve repaired ductwork in the same houses where generations of families have lived. That local knowledge matters when you’re deciding whether a 50-year-old galvanized duct is worth sealing or needs replacement.
Our Duct Repair & Sealing Services in Chicago
Duct Sealing with Mastic Sealant
Chicago’s combination of sub-zero polar vortex winters and humid Lake Michigan summers forces HVAC systems to run at near-maximum capacity for eight or more months annually. That constant pressure widens small duct leaks into major efficiency losses. We seal joints, seams, and connections with professional-grade mastic sealant - not duct tape, which fails within months in Chicago’s temperature swings. In lake-effect zones on the north and northwest sides, we use antimicrobial mastic to prevent mold colonization inside repaired seams. A typical duct sealing job in Chicago runs $280-$480 for a standard single-family system.
Flex Duct Repair
Flex duct installed during 1970s forced-air retrofits in Chicago bungalows is now 40-60 years old, often kinked around notched floor joists and compacted in crawl spaces never designed for ductwork. We recently repaired a flex duct branch in a bungalow on Archer Heights where the original 1970s octopus plenum still sat in the basement, and the flex duct was so kinked and compacted that we had to use hand tools to cut out and replace a 12-foot section with new Rotobrush-compatible flex duct, sealing all connections with mastic. Standard flex duct repair in Chicago costs $180-$340; jobs requiring new access cuts in cramped bungalow crawl spaces run $320-$520.
Metal Duct Repair
Postwar tract homes on Chicago’s far north and south sides contain galvanized sheet metal ductwork now 50-70 years old with heavy oxidation scale that prevents mastic from adhering properly. Our technicians grind and prep oxidized surfaces before applying sealant, or replace sections where metal fatigue has created cracks. Metal duct repair in Chicago typically runs $240-$450, with full section replacement reaching $380-$650 when access is limited. We use Nikro equipment to extract debris from these older metal systems before sealing, ensuring the repair lasts.
Duct Insulation Replacement
Pre-WWII two-flats, three-flats, and courtyard greystones throughout Chicago frequently contain asbestos-wrapped duct insulation from mid-century forced-air conversions. We assess for ACM before any aggressive work and coordinate with certified abatement contractors when necessary. Non-asbestos insulation replacement runs $200-$400 per duct run in Chicago, with full system reinsulation reaching $800-$1,400 depending on accessibility.
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 Chicago
We carry Rotobrush and Nikro equipment on every truck, and stock Honeywell and Aprilaire components for common Chicago HVAC configurations. That local parts inventory means most repairs don’t wait for shipping - a critical advantage when your furnace is running flat-out during a January cold snap and a duct leak is dumping heated air into your walls. Our technicians know which Aprilaire humidifier models were spec’d into 1980s north-side tracts and which Honeywell zone panels fail most often in bungalow conversions. That familiarity saves time and gets your system sealed and running faster.
Common Duct Repair & Sealing Problems We See in Chicago Homes
- Asbestos-wrapped duct insulation disturbed during repair. Pre-war two-flats and greystones across Chicago contain ACM insulation from mid-century conversions. We test before cutting and coordinate certified abatement when needed - never a surprise, never rushed.
- Galvanized sheet metal oxidation preventing sealant adhesion. Postwar tracts on the far south side show heavy scale buildup inside 50-70-year-old metal ducts. We grind and prep surfaces or replace sections rather than applying mastic over failing metal.
- Lake-effect moisture infiltration causing mold in repaired seams. On the north and northwest sides, moisture pushes through aging building envelopes and colonizes ductwork. We seal with antimicrobial mastic and address the envelope leak when possible.
- Original octopus plenums with kinked flex branches in bungalows. The roughly 80,000 classic Chicago bungalows retrofitted with forced air contain 1970s-era plenum systems so cramped that standard rotary brushes can’t pass. Hand tools and new access cuts are often required - a Chicago-specific challenge unseen in suburban ranch homes.
Pricing for Duct Repair & Sealing in Chicago, IL
We show one honest price before we start. No bait coupons, no changes at the door.
| Service | Typical Range in Chicago |
|---|---|
| Basic duct sealing (mastic, accessible joints) | $280-$480 |
| Flex duct repair/replacement | $180-$340 |
| Flex duct with new access cuts (bungalow crawl spaces) | $320-$520 |
| Metal duct repair (grinding, sealing) | $240-$450 |
| Metal duct section replacement | $380-$650 |
| Duct insulation replacement (per run, non-ACM) | $200-$400 |
| Full system reinsulation | $800-$1,400 |
Factors that affect your specific price: accessibility (crawl space vs. basement), material type and age, whether asbestos abatement is required, and the extent of oxidation or damage. We offer $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Call (877) 502-3903 for an exact quote - estimates are free.
We Also Serve Cities Near Chicago
Our Duct Repair & Sealing in Chicago coverage extends throughout the central city and into Near South Side, Lower West Side, Douglas, and Chicago Loop. Same-day response, same upfront pricing, same 90-Day Done Right Promise. Wherever you are in the city, we’ll be there when we say.
Serving Chicago, IL - Our Local Coverage Area
We’re based in the Chicago 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 Chicago
Chicago’s roughly 80,000 classic bungalows were built for steam radiator heat between 1910 and 1940, then retrofitted with forced-air systems decades later in spaces never designed for ductwork. That retrofit ductwork is now 40-60 years old, routed through cramped crawl spaces and oddly notched floor joists in configurations that standard equipment cannot navigate. We regularly cut new access panels to reach damaged sections - a need nearly unseen in postwar suburban homes with full basements and generous clearances. Call (877) 502-3903 for a free estimate on your bungalow’s ductwork.
We assess for asbestos-containing material before any cutting or aggressive cleaning, and we coordinate with certified abatement contractors when ACM is present. We never disturb asbestos-wrapped insulation without proper containment and disposal protocols. This is common in Chicago’s pre-war two-flats and greystones, and we build that assessment into every initial inspection. If you suspect asbestos in your ductwork, call (877) 502-3903 - we’ll inspect and advise at no charge.
Standard mastic will not bond properly to heavily oxidized galvanized steel. We grind and mechanically prep oxidized surfaces, or replace sections where oxidation has progressed to metal fatigue. Postwar tracts on Chicago’s far north and south sides show this problem frequently in 50-70-year-old systems. The repair costs more than a simple seal, but it lasts. Call (877) 502-3903 and we’ll show you the condition of your metal ducts on camera before quoting.
Lake-effect moisture pushes through aging building envelopes on Chicago’s north and northwest sides, raising humidity inside ductwork to levels that support mold growth. Even properly sealed ducts can recolonize if the envelope leak isn’t addressed. We use antimicrobial mastic on repairs in these zones and advise homeowners on envelope improvements when we find chronic moisture. If you smell mustiness when your system runs, call (877) 502-3903 - estimates are free.
Yes. Technicians working Bridgeport, Archer Heights, and Back of the Yards bungalow blocks routinely find the original octopus-style plenum from a 1970s conversion still sitting in the basement, with flex duct branches so kinked and compacted that a standard rotary brush cannot pass. It’s a Chicago-specific problem that requires hand tools and extra access cuts that a suburban ranch-home job never demands. We’ve replaced dozens of these systems and can show you exactly what you’re living with on camera. Call (877) 502-3903 for an inspection.
Ready to get your ductwork sealed right? Call Bellows Air Duct & Vent Co. at (877) 502-3903 for a free estimate. We’ll inspect with a camera, quote one honest price before we start, and back every repair with our 90-Day Done Right Promise in writing. Ray Dempsey and our team have served Chicago homeowners for over 42 years, and we’ll be there when we say.
Written by Ray Dempsey, Owner at Bellows Air Duct & Vent Co., serving Chicago since 2012.