Fast, Reliable Duct Repair & Sealing Across Austin
Most duct repair companies in Austin are built for standard suburban lots. We’re built for the rest of it. In Austin’s outer acreage properties - from the Hill Country fringes down to the cedar breaks - heavy-duty duct repair often involves oversized flex runs through detached workshops and garages with longer service drives, a setup rare in denser metros where standard residential duct layout is more compact. We bring the equipment and the crew for jobs that require more than a van and a roll of tape. Our Duct Repair & Sealing team covers all of Austin, including 78723, 78724, 78725, and 73301, and we’ll tell you straight whether your system needs a patch or a full reseal before we unload a single tool. Call (866) 347-2063 for a free estimate.
Why Bellows Air Duct & Vent Co. of Texas Is Austin’s Preferred Duct Repair & Sealing Company
We’ve been serving Texas homeowners since 1984 - long enough to know that Austin isn’t Houston and it sure isn’t Dallas. The city’s mix of 1940s bungalows, 1970s ranch homes, and explosive new construction means every duct system tells a different story. Our technicians are background-checked, uniformed, and trained to read that story before they cut anything.
Austin customers call us because we answer the phone. Live person, 24 hours a day. No app, no voicemail tree. When your AC is pushing 95-degree air through a gap in your trunk line in July, you want a human who can dispatch a crew - not a chatbot promising a callback.
We show up when we say we will. Most jobs finish in a single visit. And every one of them carries our 90-Day Done Right Promise in writing: if it’s not right, we make it right, no paperwork, no arguing. That’s been our policy for over 42 years, and it’s not changing.
Our pricing is disclosed upfront, before a single tool is lifted. The number on the phone is the number on the invoice. No bait coupons, no price changes at the door. For repairs over $250, we offer $50 off. Seniors and veterans receive a permanent 5% discount. And if another company gave you a written estimate, we’ll provide a free second opinion.
Our Duct Repair & Sealing Services in Austin
Duct Sealing
Austin’s HVAC systems run 9-10 months a year under sustained heat load. That means air moves through your ducts constantly, and every gap is money bleeding into your attic or crawl space. We seal with mastic and professional-grade materials, not hardware-store tape that dries out in a single Texas summer. In older homes near Zilker and Bouldin Creek, we regularly find original metal trunk lines with gaps too large for tape - mastic is the only repair that holds.
Flex Duct Repair
Flex duct is the standard in Austin’s 2010s-2020s construction boom, but it’s also the first thing to fail when clogged with post-construction debris or crushed by careless attic work. We replace damaged flex runs with properly sized, insulated lines, and we always clean the system first - because caliche limestone dust and drywall grit will destroy a new flex joint in months if it’s not cleared out. We serviced a 1950s ranch-style home in Zilker (78704) where the original metal trunk line had corrosion gaps from decades of humidity swings - a common sight in Austin. We sealed the entire system with mastic and reinforced the flex duct transitions, using our Rotobrush to clear out the Mountain Cedar dust that had accumulated post-pollen season.
Metal Duct Repair
Central Austin’s 1940s-1970s housing stock - the bungalows and ranch homes in ZIP codes like 78702, 78703, 78704, and 78705 - often still runs on original or early-generation metal trunk lines. These corrode faster in Austin’s climate than in drier Texas markets. Humidity swings between wet springs and brutal dry summers create condensation inside poorly sealed joints, accelerating rust. We repair metal duct with proper reinforcement and transition to flex where the original design has failed beyond practical repair.
Duct Insulation
Uninsulated or degraded duct insulation is a bigger problem in Austin than most homeowners realize. When your attic hits 140 degrees in August, every inch of exposed metal trunk line is radiating heat into the air you paid to cool. We install proper insulation barriers, particularly critical on longer service runs to detached workshops and garages where the ductwork is exposed to more extreme temperature swings. For acreage properties, this isn’t optional - it’s the difference between a system that works and one that runs constantly without ever catching up.
Mastic Sealant
Mastic is our go-to sealant for Austin’s climate. Unlike tape, it doesn’t dry, crack, or peel under thermal expansion. We apply it by hand to every joint and gap, building a permanent seal that holds through humidity swings and sustained heat load. For homes that have been “repaired” three times with tape that failed, mastic is usually the first thing we do that actually sticks.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
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 Austin
We work with the same equipment brands that serious HVAC contractors specify: Rotobrush for thorough duct cleaning before sealing, Honeywell for air quality components, and Guardsman for protective treatments. We stock parts and materials locally, so most Austin repairs don’t wait on shipping. Our technicians carry Rotobrush systems on every truck - because a sealant job on dirty ducts is a sealant job that will fail. We clean first, seal second, and we verify both with camera inspection before and after.
Common Duct Repair & Sealing Problems We See in Austin Homes
- Uninsulated metal ducts in older bungalows - In 78702, 78704, and surrounding central ZIPs, original metal trunk lines from the 1940s-1970s corrode faster due to Austin’s humidity swings. Standard tape fixes can’t seal the gaps long-term; mastic and reinforcement are required.
- Post-construction debris in newer tract homes - Austin’s 2010s-2020s building boom left thousands of homes with flex duct joints clogged by drywall dust and caliche limestone debris. Repairs fail if the lines aren’t cleaned first; we see this constantly in developments north and east of downtown.
- Undersized sealing supplies on acreage properties - Detached workshops and garages with longer service runs need heavier-duty flex connections and more mastic than standard residential jobs. Techs who underestimate the scale end up making two trips. We don’t.
- Mountain Cedar accumulation post-pollen season - Ultra-fine cedar pollen infiltrates return vents and embeds in ductwork from December through February. After Cedar Fever season, we see a predictable spike in calls from Austin residents whose systems are circulating pollen they thought was gone.
Pricing for Duct Repair & Sealing in Austin, TX
Here’s what duct repair and sealing costs in the Austin market:
| Service | Typical Range in Austin |
|---|---|
| Basic duct sealing (mastic, up to 10 joints) | $280-$450 |
| Flex duct repair/replacement (single run) | $220-$380 |
| Metal duct repair with reinforcement | $340-$580 |
| Duct insulation (per linear foot) | $8-$14 |
| Full system reseal with camera inspection | $650-$1,200 |
What moves the price: accessibility (crawl space vs. attic vs. detached structure), length of damaged runs, whether cleaning is required before sealing, and whether we’re matching existing insulation R-value. Acreage properties with longer service runs to workshops typically run 20-30% above standard residential pricing due to material and labor scale. We disclose every cost before work begins - no bait pricing, no changes at the door. Call (866) 347-2063 for a free estimate. Repairs over $250 qualify for $50 off.
We Also Serve Cities Near Austin
Our service area extends to Austin‘s surrounding communities, including Hornsby Bend, Wells Branch, Anderson Mill, and Jollyville. Same crew, same equipment, same upfront pricing. Whether you’re in a downtown bungalow or an acreage property off the cedar breaks, we’ll be there when we say.
Serving Austin, TX - Our Local Coverage Area
We’re based in the Austin 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 Austin
Austin’s combination of sustained 9-10 month HVAC runtime, dramatic humidity swings, and ultra-fine Mountain Cedar pollen creates conditions that degrade seals and clog systems faster than in drier or cooler markets. Tape-based repairs dry and crack under thermal expansion; mastic is the only reliable long-term sealant here. If your last repair didn’t last, it was probably the wrong material for this climate. Call (866) 347-2063 and we’ll assess what failed and why.
Yes. We specialize in the longer service runs and heavier-duty flex connections that acreage properties require. Most standard residential crews underestimate the material and labor scale for detached structures. We don’t. We’ll quote it accurately the first time and finish in one trip. Call for a free estimate.
Mountain Cedar pollen - locally called Cedar Fever - releases from December through February in concentrations among the worst in the nation. The ultra-fine particles infiltrate return vents and embed in ductwork, creating a post-season demand spike from late January through March that doesn’t exist even 90 miles away in San Antonio or Dallas. We always clean ducts thoroughly with our Rotobrush system before sealing, because sealing over cedar pollen just traps it. Call (866) 347-2063 to schedule post-season cleaning and inspection.
If your ductwork runs through an attic that hits 130-140 degrees in summer, yes. Uninsulated metal trunk lines radiate heat directly into cooled air, forcing your system to run longer without reaching set temperature. This is especially critical on longer runs to detached workshops and in older homes with original uninsulated lines. We install proper insulation barriers as part of our repair and sealing service. Call for an assessment of your current insulation condition.
Mastic. Tape fails predictably in Austin’s sustained heat load and humidity swings. Mastic remains flexible, fills irregular gaps, and doesn’t degrade under thermal expansion. It’s the only sealant we use for permanent repairs. Every mastic seal we apply is camera-verified before we close the job. Call (866) 347-2063 for a free estimate - we’ll show you exactly where your current seals are failing and why mastic is the fix.
Ready to stop losing cooled air to your attic? Call Bellows Air Duct & Vent Co. of Texas at (866) 347-2063 for a free estimate on duct repair and sealing in Austin. We’ll inspect your system with our camera, quote the work upfront, and stand behind it with our 90-Day Done Right Promise - in writing, no arguing, backed by over 42 years of doing what we say we’ll do.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving Austin since 1984.