Fast, Reliable Duct Repair & Sealing Across South Houston
Duct repair and sealing in South Houston typically runs $280-$750 for most residential jobs, with same-day service available when you call before noon. We’re local to Harris County and usually reach homes in the 77587 ZIP code within 45 minutes of a scheduled appointment.
We’ve been driving to South Houston since 1984, back when Spencer Highway was the main corridor through a patchwork of post-war neighborhoods built for refinery and port workers. Our Duct Repair & Sealing team knows the area’s housing stock intimately: small brick-and-frame homes on slab foundations, many with original 1950s-1970s metal ductwork that’s been patched, partially replaced, or simply left to age in place. That familiarity matters. When we pull up to a home near Texas Avenue or Monroe Road, we’re not guessing what we’ll find in the crawl space or attic. We’ve already worked on dozens of houses with the same footprint, the same mixed metal-and-flex configurations, the same decades of accumulated problems. Call (866) 347-2063 and we’ll give you an upfront price before we start.
Why Bellows Air Duct & Vent Co. of Texas Is South Houston’s Preferred Duct Repair & Sealing Company
South Houston homeowners have kept us busy for over 42 years, and we’ve earned our reputation one job at a time. Wade Kellerman has led this company since its founding, and our technicians still answer to him directly. The reviews we receive from South Houston customers consistently mention the same things: we show up when we say we will, we explain what we’re doing before we do it, and we leave the work area cleaner than we found it.
Our response time to South Houston is among the fastest in our service area. Because our primary location is in Houston proper, we can usually dispatch a crew to 77587 within the hour during business hours. For after-hours emergencies, a live person answers our phone 24 hours a day - not a voicemail tree, not an app. We’ve had South Houston customers call at 10 p.m. with an AC duct that has separated completely, blowing attic air into their living room, and we’ve had a technician there before midnight.
What separates us from competitors who also claim to serve South Houston is our specific knowledge of this area’s industrial air burden. Homes here sit roughly 4-5 miles from the Houston Ship Channel’s refinery corridor, and that proximity creates duct contamination problems you simply don’t see in The Woodlands or Katy. We’ve developed protocols for degreasing and sealing ductwork that accounts for this reality. Other companies seal over the problem. We remove it first.
Our Duct Repair & Sealing Services in South Houston
Metal Duct Repair
South Houston’s housing stock is heavy on original galvanized steel ductwork, and metal ducts don’t fail all at once. They rust at seams, separate at joints, and develop pinholes from decades of vibration. We repair metal ducts by cutting out damaged sections, fabricating replacement pieces on-site, and securing them with mechanical fasteners and mastic sealant. In homes near Spencer Highway or College Avenue, we regularly find metal plenums that have been “repaired” with duct tape - which always fails - or patched with flex duct that doesn’t match the system’s airflow capacity. We fix it properly, with materials rated for the pressure and temperature of your HVAC system.
Mastic Sealant Application
Mastic is the only sealant we trust for permanent duct sealing in South Houston, and there’s a reason we emphasize it on this page. The oily particulate film that coats ductwork near the Ship Channel prevents standard tapes and aerosol sealants from adhering properly. We clean and degrease every surface before applying mastic, then brush on a thick, fiber-reinforced layer that cures to a flexible, durable seal. This extra step takes time. Companies that skip it are sealing over contamination that will eventually bleed through. We’ve been called back to too many South Houston homes where a previous contractor’s mastic peeled off within a year because they didn’t degrease first.
Air Leak Repair
Air leaks in South Houston ductwork waste an average of 20-30% of conditioned air, according to Department of Energy estimates, and in older homes with original metal-to-flex transitions, that number can run higher. We pressure-test the system before and after repair to measure actual improvement. Common leak points in local homes include plenum connections that have loosened over decades, flex duct collars that were never properly sealed, and return air pathways that pull attic air directly into the system. We seal every joint, every seam, every penetration - and we verify our work with a follow-up pressure test.
Flex Duct Repair
Flex duct is common in South Houston homes that have had partial HVAC upgrades, and it fails differently than metal. The inner liner tears, the insulation gets waterlogged, and the outer vapor barrier degrades in attic heat. We replace damaged flex duct with new, properly sized runs and support them so they don’t sag or kink. Sagging flex duct is a particular problem in South Houston’s older attics, where original framing wasn’t designed for modern duct routing. We install proper supports and avoid the tight bends that restrict airflow.
Duct Insulation
Adding or replacing duct insulation in South Houston pays for itself quickly. Attic temperatures here exceed 130°F in summer, and uninsulated or poorly insulated metal ducts lose cooling capacity before the air ever reaches your living room. We use insulation rated for high-humidity environments, with a proper vapor barrier facing, because South Houston’s Gulf Coast climate means attics stay damp for months. Wet insulation is worse than no insulation - it breeds mold and collapses against the duct, constricting airflow.
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 South Houston
We stock parts and materials from Rotobrush, Honeywell, and Aprilaire for South Houston jobs, which means most repairs don’t require a second trip. Rotobrush equipment handles the mechanical cleaning and surface prep that’s essential before sealing in this area. Honeywell and Aprilaire supply the filtration and ventilation components we install when a home’s original system can’t keep up with local air quality demands. Having these parts on our trucks matters in South Houston, where the combination of industrial particulates and aging infrastructure means we can’t always predict what we’ll need until we’re inside the ductwork. Our technicians carry enough inventory to complete most jobs in a single visit.
Common Duct Repair & Sealing Problems We See in South Houston Homes
- Oily particulate buildup from Ship Channel emissions. This isn’t ordinary dust. It’s a fine, greasy film that standard cleaning brushes won’t remove. We use specialty degreasing solvents developed for industrial HVAC maintenance, then seal the cleaned surfaces so new contamination can’t penetrate as easily.
- Mixed metal-and-flex duct configurations with gap-prone joints. South Houston homes often have original metal plenums connected to newer flex duct runs, and the transition points were rarely sealed properly. Air leaks at these joints pull attic air into the system, along with whatever contaminants are up there.
- Flood-related mold in supply plenums from Hurricane Harvey. Even homes that took on minor water intrusion during the 2017 flooding frequently developed mold colonies inside ductwork. Sealing over mold doesn’t solve the problem - it traps it. We inspect with cameras, treat affected areas, and verify clearance before any sealing work begins.
- Mastic failure from improper surface preparation. We’ve opened too many South Houston ducts to find peeling mastic that was applied over oily residue. The previous contractor saved an hour and cost the homeowner a redo. We don’t skip steps.
Pricing for Duct Repair & Sealing in South Houston, TX
Here’s what honest pricing looks like for Duct Repair & Sealing in South Houston:
| Service | Typical Range |
|---|---|
| Single air leak repair (accessible) | $180-$280 |
| Mastic sealing of plenum and main trunk | $320-$480 |
| Flex duct section replacement (per run) | $240-$380 |
| Metal duct section repair/replacement | $280-$520 |
| Full system degrease, clean, and seal | $580-$750 |
| Duct insulation replacement (per run) | $200-$340 |
What moves you within these ranges: accessibility (crawl space vs. open attic), extent of contamination requiring degreasing, number of leak points found during pressure testing, and whether mold remediation is needed before sealing. We present the full price before we start. No bait coupons, no add-ons at the door. Our $50 Off Any Repair Over $250 applies to duct repair work, and we offer a Free Second Opinion on Any Written Estimate if you’ve already been quoted by another company. Call (866) 347-2063 for a free estimate - we’ll give you a firm number you can count on.
We Also Serve Cities Near South Houston
Our service area extends throughout the Ship Channel corridor and surrounding communities. We regularly perform duct repair and sealing in Pasadena, Galena Park, Deer Park, and Jacinto City - all of which share similar industrial air quality challenges and aging housing stock with South Houston. If you’re in one of these neighboring cities and have been told your ductwork can’t be repaired, call us for a second opinion.
Serving South Houston, TX - Our Local Coverage Area
We’re based in the South Houston 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 South Houston
The chemical odor persists because standard cleaning and sealing doesn’t remove the oily particulate film from Ship Channel emissions that coats your duct walls. We degrease with specialty solvents before sealing, which eliminates the source of the smell rather than trapping it. Call (866) 347-2063 if you’ve had a bad experience with a contractor who skipped this step - estimates are free.
Most original metal ductwork in South Houston can be repaired if the damage is limited to seams, joints, or isolated rust sections. Full replacement becomes necessary when the metal has thinned extensively or the plenum itself has failed. We inspect with cameras and give you an honest assessment - we’ll tell you when repair is the square deal and when replacement is the only lasting fix.
Homes that took water during Hurricane Harvey, even minor intrusion, frequently developed mold in supply plenums that standard cleaning doesn’t reach. Sealing over this mold traps spores and causes recontamination. We camera-inspect for mold, treat affected areas with appropriate methods, and verify clearance before sealing. This is standard protocol for us on South Houston jobs.
Fiber-reinforced mastic, applied to properly degreased surfaces, is the only sealant we trust for permanent results in South Houston’s industrial-corridor homes. Tapes, aerosols, and mastic applied over oily residue all fail prematurely. We brush on mastic thick enough to bridge small gaps and flex with the ductwork as it heats and cools.
Sealing alone won’t stop the smell if the oily film remains inside the ducts - it will eventually permeate the sealant. Our process removes the contamination first, then seals to prevent new infiltration. For homes very close to the Ship Channel, we may also recommend upgraded filtration to reduce future buildup. Call (866) 347-2063 and we’ll evaluate your specific situation.
Ready to get your South Houston ductwork fixed right? Call Bellows Air Duct & Vent Co. of Texas at (866) 347-2063 for a free, upfront estimate. We’ll be there when we say, we’ll show you what we find with our camera inspection, and we’ll stand behind the work with our 90-Day Done Right Promise - in writing, no arguing, no paperwork if something needs adjustment. That’s been our deal since 1984.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving South Houston since 1984.