Fast, Reliable Duct Repair & Sealing Across Schertz
Duct repair and sealing in Schertz typically runs $180-$650 depending on whether you’re addressing a few disconnected joints or replacing collapsed flex duct runs, and most of our Duct Repair & Sealing jobs in ZIP 78154 finish in a single visit. We’re familiar with the tract homes off Schertz Parkway, the properties lining FM 3009, and the military-renter corridors near Randolph where original 1990s flex duct has been baking in attics above 140°F for two decades. If your ducts are leaking conditioned air into the attic, pulling cedar pollen through gaps, or your energy bills have climbed without explanation, we’ll diagnose it with a camera inspection and show you exactly what needs fixing before we start. Call (844) 685-6342 - we’re the team Schertz homeowners call when they want it handled right in one trip.
Why Bellows Air Duct & Vent Co. Is Schertz’s Preferred Duct Repair & Sealing Company
We’ve been serving South Texas since 1984, and Schertz has been part of our route for decades as the city grew from a quiet bedroom community into the bustling northeastern suburb it is today. Our technicians know the difference between a 1998-built home near Randolph with original tan flex duct and a 2008 build off Cibolo Valley Drive with newer runs - and they adjust their approach accordingly.
Schertz customers tell us they appreciate that we answer the phone with a live person, 24 hours a day. No voicemail maze. No app to download. Just someone who can get a technician to your door, often same-day for urgent leaks or collapsed runs. Our background-checked, uniformed techs arrive with the equipment to complete most repairs in one visit, including mastic sealant, insulated flex duct, and professional-grade tools from Rotobrush and Nikro.
Our 90-Day Done Right Promise applies to every Schertz job. If the seal doesn’t hold or a joint we repaired fails, we return at no charge. No paperwork to file. No argument. That’s how we’ve operated for over 42 years.
Our Duct Repair & Sealing Services in Schertz
Duct Sealing
Leaky duct joints in Schertz homes waste an average of 20-30% of conditioned air, and in summer that means your AC is working overtime to cool your attic instead of your living room. We seal accessible joints with mastic sealant, a water-based compound that remains flexible and outperforms foil tape long-term in our heat. For homes near Randolph with original construction ductwork, we often find disconnected flex collars where the duct has pulled away from the plenum - we reattach and seal these properly rather than covering them with tape that will fail in the next heat wave.
Flex Duct Repair
Flex duct repair is our most common call in Schertz, and for good reason. The 1990s-to-2000s build-out that defines this city used builder-grade flex duct routed through unconditioned attics, and twenty-plus years of 140°F summer heat has degraded the inner liners. At a 1998-built home on Schertz Parkway near Randolph, we found the original flex duct had collapsed at a sagged run where the inner liner detached, trapping cedar pollen layers from every December since 2012. We cut out the damaged section, sealed the remaining joints with mastic, and replaced the sagged run with insulated flex duct from our Rotobrush system, ensuring no debris remained to recirculate.
Sagged runs are especially common in larger Schertz homes with longer duct spans to distant bedrooms. The flex duct collapses under its own weight where supports have failed, creating a debris trap that standard cleaning cannot reach. We replace these with properly supported, insulated flex duct sized to your system’s CFM requirements.
Metal Duct Repair
While most Schertz homes use flex duct, some custom builds and older properties in the area have galvanized metal trunk lines. These can develop rust at seams, separated drive cleats, or failed sealant at takeoff connections. We repair metal duct with proper mechanical fastening and seal with mastic rated for metal substrates. For Schertz homeowners with metal duct systems, our camera inspection shows you exactly where the leaks are - no guesswork.
Duct Insulation
Uninsulated or degraded duct insulation in a Schertz attic is a double penalty: you’re losing cooling efficiency through the duct walls, and the outer vapor barrier has likely failed, allowing fiberglass particles to enter your air stream. We install new insulation with intact vapor barriers on repaired or replaced flex duct runs, particularly critical for the long spans common in Schertz’s larger homes. Proper insulation also prevents condensation on cool duct surfaces during our humid spring and fall seasons, which can lead to mold growth in the duct interior.
Mastic Sealant Application
Mastic is our preferred sealant for Schertz’s climate. Unlike tape that degrades in attic heat, mastic remains flexible and maintains its seal through thermal expansion and contraction. We brush-apply mastic to all accessible joints, seams, and connections after repair work is complete. For homes in the military-renter corridors near Randolph where ductwork has gone untouched since construction, this is often the first proper seal the system has ever received.
Air Leak Repair
Air leaks at plenum connections, filter slots, and around duct boots waste energy and pull unfiltered attic air into your living space. In Schertz’s caliche-dust environment, this means fine particulate entering your home continuously. We identify these leaks with pressure testing and visual inspection, then repair and seal them properly.
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 Schertz
We stock parts and materials from Nikro, Honeywell, and Aprilaire - the same brands serious HVAC contractors specify for durable, code-compliant installations. Our Schertz technicians carry insulated flex duct, mastic sealant, mechanical fasteners, and replacement collars on every truck, so we’re not making a supply run while your attic is open to the heat. For the Rotobrush equipment we use on duct repair and replacement jobs, we maintain factory-authorized access to replacement components and upgraded attachments. This matters in Schertz, where a second trip means another afternoon of 140°F attic work and another day of your system running inefficiently.
Common Duct Repair & Sealing Problems We See in Schertz Homes
- Original flex duct delamination from attic heat. In Schertz’s 1990s-built homes, especially near Randolph, we regularly find the inner liner of flex duct has separated from the wire helix, creating a flapping obstruction that traps debris and restricts airflow. The outer insulation looks intact, but the duct is functionally collapsed inside.
- Disconnected joints at flex collars. The brutal expansion and contraction from Schertz’s 140°F attic summers to 40°F winter nights works flex collars loose over time. Conditioned air leaks into the attic, and return leaks pull cedar pollen and caliche dust through gaps that bypass your filter entirely.
- Sagged runs in homes with long duct spans. Schertz’s larger homes, including acreage properties with detached workshops, often have duct runs that sag where supports have failed or were never properly installed. These low points collect debris and moisture, becoming mold reservoirs that distribute spores every time the system cycles.
- Cedar pollen accumulation in untouched systems. In Schertz’s military-renter corridors, ductwork that hasn’t been opened since construction contains layered deposits of mountain cedar pollen from decades of December-through-February seasons. This fine allergen recirculates continuously until physically removed and the source leaks are sealed.
Pricing for Duct Repair & Sealing in Schertz, TX
We’re upfront about pricing because Schertz homeowners have told us that’s what they value most after dealing with contractors who lowball by phone and inflate at the door.
| Service | Typical Range in Schertz |
|---|---|
| Single joint sealing (mastic) | $180 - $280 |
| Flex duct section replacement (per run) | $320 - $480 |
| Multiple joint repair and sealing | $450 - $650 |
| Duct insulation replacement (per run) | $280 - $420 |
| Full system inspection with camera | $89 - $149 (credited toward repair) |
What moves a job toward the higher end: longer duct runs common in Schertz’s larger homes, multiple collapsed sections requiring replacement rather than repair, and access challenges in tight attics. What keeps costs down: catching problems early before delamination spreads, and bundling repair with your scheduled duct cleaning. We show you the exact price before we lift a tool, and our $50 Off Any Repair Over $250 standing offer applies to most flex duct replacement jobs. Call (844) 685-6342 for a free estimate - the number we quote is the number on the invoice.
We Also Serve Cities Near Schertz
Our technicians cover the full northeastern San Antonio corridor, including Duct Repair & Sealing in Schertz plus Universal City, Cibolo, Converse, and Live Oak. Same live-answer phone line, same 90-Day Done Right Promise, same upfront pricing. If you’re in one of these communities and your ducts are leaking or your flex duct has seen better days, we’ll be there when we say.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz 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 Schertz
Mountain cedar pollen from December through February loads duct interiors with fine allergen particles that recirculate until physically removed, and leaky duct joints allow this pollen to bypass your filter entirely. In Schertz homes with original construction ductwork, we’ve found layered cedar pollen deposits dating back decades, essentially forming a seasonal record of every cedar fever event the home has sat through. Sealing these leaks and removing accumulated pollen requires professional equipment - a shop vacuum won’t touch it. Call (844) 685-6342 and we’ll show you what your ducts contain with a camera inspection; estimates are free.
The combination of 140°F attic heat and 20-plus years of thermal cycling degrades the inner liner of original builder-grade flex duct until it delaminates and collapses, creating debris traps that no cleaning process can fully restore. In Schertz’s military-renter corridors near Randolph, this damage is compounded by years of neglect as tenants rotate through on PCS orders without scheduling maintenance. Once the inner liner detaches, replacement is the only proper repair. We cut out the damaged section and install new, properly supported insulated flex duct - most jobs finish in one visit. Call (844) 685-6342 for an assessment; our Free Second Opinion on Any Written Estimate applies if you’ve already been quoted.
Yes. Our trucks carry the heavy-duty tools and materials to repair and seal ductwork in detached workshops, outbuildings, and accessory structures common on Schertz’s acreage properties. We treat these as extensions of your main system: same camera inspection, same mastic sealing, same 90-Day Done Right Promise. The key challenge is often long, unsupported flex duct runs to distant structures that sag and leak - we address support and insulation as part of the repair. Call (844) 685-6342 to schedule; most workshop jobs complete in a single visit alongside your main home service.
We use professional-grade mastic sealant, Nikro HEPA equipment for debris containment during repair, and Rotobrush systems for duct replacement and thorough cleaning after sealing work. For insulation and replacement flex duct, we specify materials rated for the temperature extremes of Schertz’s unconditioned attics. These are the same brands and specifications serious HVAC contractors use - not discount hardware-store substitutes that fail in our heat. Call (844) 685-6342 if you’d like specifics on materials for your particular system; we’re happy to talk through it.
Expect to find original late-1990s flex duct that is brittle from attic heat, with disconnected joints at flex collars and accumulated debris including layered cedar pollen and caliche dust. This is the most common scenario our Schertz technicians encounter in military-renter corridors, and it’s entirely addressable. We start with a camera inspection so you see exactly what we’re seeing, then quote upfront for repair or replacement as needed. Most jobs finish in one visit, and our 90-Day Done Right Promise covers the work regardless of whether you own or rent. If you’re a landlord, ask about our $89 Seasonal Tune-Up to prevent future degradation. Call (844) 685-6342 to schedule; estimates are free.
Ready to stop losing conditioned air to your attic and start breathing cleaner air in your Schertz home? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate. We’ll show you exactly what your ducts need with a camera inspection, quote one honest price before we start, and stand behind the work with our 90-Day Done Right Promise. We’ve served South Texas for over 42 years, and we’re not going anywhere.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Schertz and surrounding communities since 1984.