Fast, Reliable Duct Repair & Sealing Across Houston
Duct repair and sealing in Houston typically costs $280-$850 depending on accessibility and damage extent, with most jobs completed in a single visit. We’re Bellows Air Duct & Vent Co. of Texas, and we’ve been fixing ductwork in this city since 1984 - long enough to know that Houston’s climate and housing stock create problems you won’t find in Dallas, Austin, or anywhere else. If your AC runs constantly but rooms stay uneven, your ducts are likely leaking 20-30% of conditioned air into your attic or crawlspace. Call us at (866) 347-2063 for upfront pricing and a free camera inspection.
Our Duct Repair & Sealing team serves homeowners from the Heights to Clear Lake, typically arriving same-day or next-day. We understand Houston’s tight lot lines, alley-loaded garages, and the parking headaches that come with older neighborhoods like Montrose and the Museum District. Our trucks carry Rotobrush agitation equipment, Nikro HEPA vacuums, and Aprilaire-certified mastic sealant so we don’t waste your time with supply runs.
Why Bellows Air Duct & Vent Co. of Texas Is Houston’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Houston over 42 years by showing up when we say and standing behind the work. Our 90-Day Done Right Promise means if a seal fails or a repair doesn’t hold, we return at no charge - no paperwork, no arguing. That’s not a slogan; it’s stamped on every invoice.
Houston homeowners call us because we answer the phone 24 hours a day with a live person, not an app or voicemail tree. Our technicians are background-checked, uniformed, and trained specifically on Houston’s housing stock - from 1970s slab-on-grade ranches in Katy and Pearland with attic-flex systems, to pier-and-beam bungalows in the Heights with crawl-space duct runs that flooded during Hurricane Harvey.
We don’t use bait coupons or scare tactics. Every price is disclosed before we lift a tool, and the number we quote is the number on the invoice. For repairs over $250, we currently offer $50 off. Seniors and veterans receive a permanent 5% discount. If you have a written estimate from another company, we’ll provide a free second opinion.
Our Duct Repair & Sealing Services in Houston
Mastic Sealant Application
Houston’s humidity is the enemy of duct sealing. Mastic sealant applied over dusty, uncured duct liner in a 140°F attic will fail within weeks - we’ve seen it repeatedly in Pearland and Katy homes where previous contractors cut corners. Our process starts with Rotobrush agitation to clean every joint surface, then we apply Aprilaire-certified mastic in two coats with proper cure time between. In Houston’s Gulf Coast climate, this extra step is the difference between a seal that lasts five years and one that peels before the first billing cycle closes.
Flex Duct Repair
Flex duct is the dominant material in Houston’s 1970s-1990s housing stock, and it degrades faster here than almost anywhere in the country. Attic temperatures routinely hit 140-160°F, accelerating liner delamination and causing sections to collapse internally. In Meyerland and along Brays Bayou, we regularly find flex duct that looks intact from the register but has molded or collapsed from Harvey flood saturation - homeowners who only replaced drywall after 2017 have no idea their ducts were ever compromised. We replace damaged sections with insulated flex rated for Houston’s thermal load, seal with mastic (never foil tape alone), and camera-verify before we leave.
Metal Duct Repair
Older homes in Houston’s inner loop, particularly pre-1970s construction in the Heights and Montrose, often have galvanized steel ductwork. These systems develop seam separations and rust-through from decades of condensation. We fabricate custom patches, re-seal longitudinal seams with mastic and fiberglass mesh, and address the root cause - usually inadequate insulation that’s letting humid attic air reach the cold metal surface. Metal duct repair in Houston demands attention to the humidity differential; a patch that works in Phoenix will rust out here in two seasons.
Duct Insulation
Proper insulation is what keeps mastic seals intact and prevents the condensation that breeds mold. In Houston, where AC runs roughly 10 months a year, uninsulated or degraded duct wrap is a constant source of problems. We reinsulate with formaldehyde-free fiberglass wrap or closed-cell foam where space allows, paying special attention to trunk lines in Katy and Clear Lake attics where heat stratification is most severe. For crawl-space runs in Heights bungalows, we use moisture-barrier insulation rated for ground-contact humidity.
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 Houston
We stock parts and materials from Rotobrush, Nikro, Honeywell, and Aprilaire - the same brands serious HVAC contractors specify for Houston’s demanding climate. Our trucks carry Honeywell zone dampers and Aprilaire media filters for same-day replacement, and our Rotobrush agitation systems are maintained to manufacturer spec for consistent performance in Houston’s particulate-heavy attics. Because we don’t make supply runs to distribution centers across town, most repairs finish in a single visit. That’s part of the square deal: we’ll be there when we say, and we’ll finish while you’re still home.
Common Duct Repair & Sealing Problems We See in Houston Homes
- Mastic bond failure from humidity and dust. Contractors who seal over uncured, dusty duct liner in Houston’s humid attics create a temporary fix at best. The mastic never achieves full adhesion, and the seal recreates leaks within weeks. We see this most often on quick-turnaround jobs in suburban developments.
- Flex-duct tape release from attic heat. Foil tape adhesive degradates rapidly above 140°F, which Houston attics exceed daily from May through October. On 1970s-1990s slab homes in Katy and Pearland, we regularly find entire trunk lines hanging by a single strap, leaking conditioned air directly into the attic.
- Harvey-contaminated ductwork still in service. In Meyerland and Brays Bayou neighborhoods, flex duct that survived 2017 flooding often harbors mold and silt inside the liner. Homeowners see clean drywall and assume the problem was solved. We camera-inspect and find collapsed, contaminated sections that have been circulating microbial debris for years.
- Crawl-space mold regrowth through new seals. Heights and Montrose pier-and-beam homes with residual flood silt in crawl spaces will see mold return through freshly sealed ducts unless the entire run is HEPA-vacuumed first. Skipping this step is a guarantee of callbacks.
Pricing for Duct Repair & Sealing in Houston, TX
Here’s what honest duct repair pricing looks like in Houston’s market. These are the ranges we quote before work begins - no bait, no changes at the door.
| Service | Typical Range in Houston |
|---|---|
| Single flex-duct section replacement | $280-$420 |
| Mastic sealant, full system (avg. 2,000 sq ft home) | $450-$680 |
| Metal duct patch and reseal (per section) | $320-$550 |
| Duct insulation replacement (per linear foot) | $8-$14 |
| Crawl-space flex duct repair with mold remediation prep | $580-$850 |
Costs run higher in Houston than in drier Texas cities for two reasons: our 10-month cooling season means more extensive contamination buildup, and our humidity requires additional prep steps (surface drying, anti-microbial treatment) that arid climates don’t demand. Tight crawl spaces in Montrose and the Heights add labor time. Every estimate is free, and we apply our $50 repair discount automatically on jobs over $250. Call (866) 347-2063 for your exact quote.
We Also Serve Cities Near Houston
Our service area extends to Houston‘s immediate neighbors: Bellaire, West University Place, Galena Park, and Jacinto City. Same technicians, same trucks, same upfront pricing. Whether you’re inside the Loop or in these surrounding communities, we’re typically on-site same day or next day.
Serving Houston, TX - Our Local Coverage Area
We’re based in the 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 Houston
You won’t know without a camera inspection - flex duct can appear intact from the register while being collapsed or molded internally. We recently sealed a flex-duct system in a Meyerland ranch home that had been partially submerged during Harvey; the homeowner only replaced drywall. Using Rotobrush agitation and mastic sealant, we found the main trunk line had delaminated from attic heat and was leaking 30% of conditioned air into the crawlspace. We reinsulated and sealed every joint with Aprilaire-certified mastic, restoring airflow and stopping the mold cycle. If your home flooded in 2017 and you never had ducts inspected, call (866) 347-2063 for a free camera check.
Houston’s combination of 75-90% relative humidity and 140-160°F attic temperatures prevents proper surface curing and creates condensation beneath the sealant film. In Dallas or San Antonio, a single-coat application over moderately clean duct might last years. Here, that same application peels in weeks. We counter this with thorough Rotobrush surface prep, two-coat application with extended cure time, and Aprilaire-certified mastic formulated for high-humidity environments. The extra hour of labor is why our seals hold and others don’t.
Partially, but not completely - some access is necessary for a proper repair. We can seal accessible joints from the interior using extended applicators, and we use flexible borescope cameras to assess damage without full entry. But for collapsed sections or mold-contaminated liner in Heights and Montrose crawl spaces, technician access is unavoidable for safe, complete repair. We work around your schedule and parking constraints, and our crews are experienced in tight-clearance work. Call for specifics on your home’s layout.
Houston’s near-continuous cooling season means ducts accumulate particulate and biological growth roughly 2-3 times faster than in cities with defined heating and cooling seasons. A system that might need sealing every 10-15 years in Chicago often requires attention every 5-7 years here. This increases lifetime maintenance costs but also means the return on proper sealing is faster - stopping 25% duct leakage in Houston saves more annual kWh than in any major U.S. city except Miami. Our $89 Seasonal Tune-Up can catch problems before they require full repair.
Yes, if the sealing is done without addressing moisture sources. Sealing leaks in uninsulated or poorly insulated duct actually can increase condensation by raising the pressure differential and changing air velocity patterns. We always verify insulation integrity before sealing, and we specify moisture-barrier materials for Houston’s climate. Our 90-Day Done Right Promise covers mold recurrence from workmanship - if it returns because we missed a moisture source, we fix it at no charge. That’s the difference between a patch and a proper repair.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving Houston since 1984.