Fast, Reliable Duct Repair & Sealing Across Houston
Duct repair and sealing in Houston typically costs $180–$650 depending on the system type, with flex duct repairs running $200–$400 per run and metal duct sealing at $300–$650 for whole-system work. Most Houston homeowners see same-day or next-day service, and sealing alone can cut cooling bills by 15–25% in a market where AC runs nine months a year. Call (855) 683-5929 for a free estimate — we’ll scope the job in person and give you upfront numbers.
We’ve been crawling through Houston attics and crawlspaces for two decades. From the 1940s bungalows in Montrose to the flex-duct mazes in 1980s Spring Branch subdivisions, we’ve seen how this city’s heat, humidity, and housing stock punish duct systems differently than anywhere else in Texas. Our Duct Repair & Sealing team doesn’t guess — we diagnose, seal, and repair with the same Rotobrush and Nikro equipment we use on commercial jobs. Owner Scott Gray leads every crew personally, so the person with 20 years of hands-on experience is the one actually holding the mastic brush.
Why Lone Star Air Duct Cleaning Service Houston Is Houston’s Preferred Duct Repair & Sealing Company
Our reputation here is built on repeat customers and neighbor-to-neighbor referrals, not franchise marketing. 433 verified reviews averaging 4.9 stars — that’s a volume and consistency that only comes from showing up, doing the work correctly, and standing behind it. Houston homeowners aren’t shy about calling out shortcuts; they’ve kept us honest for two decades.
Response time matters when your attic is 140°F and your second floor won’t cool below 82°. We typically reach Houston addresses from our base within 45–90 minutes depending on traffic on I-10, 610, or 59. We know which neighborhoods have alley-only access, which townhome complexes require parking permits, and which older homes have crawlspaces too tight for standard equipment — so we bring the right tools the first trip.
Scott Gray’s dual role as owner and lead technician means you get the most experienced person in the company on your job, not a rotating crew learning Houston’s quirks on your dime. That matters when we’re working in a Heights bungalow with original 1940s galvanized ductwork that needs custom-fabricated transitions — or when we’re tracing a crushed flex duct behind a closet wall in a Montrose renovation gone wrong.
Our Duct Repair & Sealing Services in Houston
Duct Sealing
Houston’s 9–10 month cooling season forces AC systems to run harder and longer than almost anywhere in the country. Every leak in your ductwork pulls 140°F attic air into the system, wasting 20–30% of your cooling capacity before it ever reaches the vents. We seal supply and return plenums, trunk lines, and branch connections using mastic sealant rated for Gulf Coast humidity — not the cheap foil tape that fails in one Houston summer. For homes in the Heights, Montrose, and Garden Oaks, we often encounter non-standard duct layouts from window-unit conversions that require creative sealing approaches the suburban crews never see.
Flex Duct Repair
The 1970s–1990s suburban explosion across Houston’s outer rings installed millions of feet of flex duct through unconditioned attics. That foil facing and internal insulation degrade fast when attic temperatures spike past 140°F for months straight. We replace crushed, kinked, or heat-damaged flex runs with properly sized new material, support it with straps every 4–5 feet per code, and seal connections with mastic — not duct tape. In tighter inner-loop homes with alley access and limited attic hatches, we use compact Nikro HEPA vacuums and flexible inspection cameras to reach full runs that other technicians abandon halfway.
Metal Duct Repair
Pre-1950s homes in the Heights, Montrose, and Eastwood neighborhoods still run galvanized sheet-metal trunk-and-branch systems that flex-duct replacements can’t simply match. Rusted seams, failed snap-lock connections, and custom transitions require sheet-metal fabrication skills most duct cleaners never developed. We repair or replace damaged sections, fabricate transitions where original parts no longer exist, and seal with mastic rated for metal expansion and contraction. The old insulation wrapped around these systems often disintegrates on contact — we replace it with fresh wrap so the rusted seams we’re fixing don’t get hidden again.
Duct Insulation
In Houston, uninsulated or degraded duct insulation isn’t just an efficiency problem — it’s a condensation and mold generator. When 55°F conditioned air runs through ducts in a 140°F attic, the temperature differential creates moisture that feeds microbial growth throughout the system. We install fresh insulation on repaired metal ducts and replace degraded flex duct where the internal liner has collapsed. For homes near the Ship Channel in Galena Park, Pasadena, and Channelview, proper insulation also helps contain the oily industrial particulate that coats duct interiors — without it, that residue migrates into living spaces even after cleaning.
Mastic Sealant Application
Mastic is the only sealant we trust for Houston’s conditions. Brush-applied mastic fills gaps up to 1/8 inch, remains flexible through thermal cycling, and won’t degrade under UV exposure in attic environments. We apply it to every metal-to-metal joint, flex-to-collar connection, and plenum seam. In flood-prone areas where ducts have carried standing water after past storms, mastic sealing is often the critical step that prevents recontamination — sealed systems don’t pull humid attic air that carries residual mold spores.
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 components from Honeywell, Aprilaire, and Guardsman to keep Houston jobs moving without waiting on shipping. Honeywell zoning dampers let us balance airflow in converted bungalows where original duct sizing no longer matches the floor plan. Aprilaire media filters and whole-house dehumidifier components integrate with sealed duct systems to handle Houston’s persistent humidity. Our Rotobrush rotary brush systems and Nikro HEPA vacuums — the same equipment used in commercial remediation — mean we don’t need to subcontract or delay. For homeowners in Bellaire, West University Place, and the Museum District, that parts availability often means same-day completion instead of a return trip.
Common Duct Repair & Sealing Problems We See in Houston Homes
- Mastic seal failure in extreme attic heat. Standard seals applied in cooler climates crack and reopen within one Houston summer. We use high-temperature mastic rated for sustained 150°F+ exposure, and we check prior repair sites that failed because the original technician used the wrong product.
- Crushed flex duct behind added walls or built-ins. Houston’s renovation boom — especially in the Heights and Montrose — means ducts get buried during additions. Our cameras locate these blockages without destructive exploratory cuts.
- Rusted metal seams hidden behind disintegrating insulation. Pre-1950s galvanized systems in inner-loop neighborhoods corrode at the seams where condensation collects. The old insulation falls apart when touched, revealing damage that previous cleaners walked past.
- Flood-damaged flex duct with residual contamination. After Hurricane Harvey’s 2017 inundation of roughly 154,000 structures, many Houston homes still have flex ducts that carried standing water. Sealing alone won’t fix microbial growth inside the liner — we scope these with inspection cameras and recommend repair or replacement based on what we find.
Pricing for Duct Repair & Sealing in Houston, TX
| Service | Typical Range in Houston |
|---|---|
| Single flex duct run repair/replacement | $200 – $400 |
| Metal duct seam sealing (partial system) | $300 – $500 |
| Whole-system mastic sealing | $450 – $650 |
| Custom metal transition fabrication | $250 – $450 per piece |
| Duct insulation replacement | $150 – $300 per run |
What moves you within these ranges? Accessibility matters — tight crawlspaces in Montrose bungalows or flat-roof townhomes with limited attic hatches take more time. Material type matters — custom-fabricated metal transitions for 1940s systems cost more than standard flex replacement. And system condition matters — flood-damaged ducts with internal mold require more extensive work than simple leak sealing. We don’t quote over the phone for repair work; we inspect, show you the camera footage, and give you a written estimate before starting. Estimates are free. Call (855) 683-5929 to schedule.
We Also Serve Cities Near Houston
Our service radius covers Bellaire, West University Place, Aldine, and Jacinto City with the same owner-led response we provide inside Houston proper. Bellaire and West University Place homeowners deal with similar aging stock and tight lot constraints. Aldine and Jacinto City see more of the 1970s–1980s flex-duct construction that’s hitting its failure window now. Wherever you are in the metro, Scott Gray leads the job personally.
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
Sealing helps, but it’s only part of the solution for homes downwind of the Ship Channel in Galena Park, Pasadena, Channelview, and Deer Park. We first inspect with a camera to see if that dark, oily particulate has coated the duct interior — cleaning removes the residue, then sealing the supply plenum and return connections prevents re-introduction of contaminated attic air. Call (855) 683-5929 and we’ll scope it; estimates are free.
We use compact inspection cameras and flexible-seal application tools designed for tight-clearance jobs common in Houston’s inner-loop townhomes. Flat-roof structures often have limited attic space or scuttle hatches instead of full access; we bring extension poles, mini-split access panels, and in some cases scope through return grilles if that’s the only entry point. Scott Gray has done hundreds of these — he’ll walk the access with you before quoting. Call (855) 683-5929 to set up a look.
Replace them if they carried standing water; seal them if they only experienced elevated humidity. Flood water inside flex duct saturates the internal fiberglass liner, and no amount of sealing prevents mold spores from that reservoir re-entering airflow. We scope with cameras to distinguish surface moisture from internal saturation — a $200 inspection that saves you from sealing ducts that need replacement. Call (855) 683-5929 for a camera inspection.
Yes, in most cases. Heights and Montrose bungalows typically have basement or crawlspace access to the main trunk, and we use remote-seal application tools for branch lines. Where walls contain short inaccessible runs, we seal from the nearest accessible junction and verify pressure balance with a flow hood. We won’t promise what we can’t deliver — Scott Gray will show you the access plan during the free estimate. Call (855) 683-5929.
Probably airflow balance, not leakage. Houston’s long cooling season exposes design flaws that milder climates never stress — undersized returns, missing jump ducts, or supply runs that lose capacity to attic heat gain before reaching the second floor. We use Honeywell zoning dampers and flow-hood testing to verify delivery at each grille, not just seal what’s accessible. Sometimes the “repair” was fine; the system was never designed to cool that load. We’ll tell you which it is. Call (855) 683-5929 for a diagnostic.
Ready to stop throwing cooling money into your attic? Call (855) 683-5929 for a free, on-site estimate. Scott Gray will inspect your system personally, show you exactly where the leaks or damage are, and give you upfront pricing before any work begins. We’ve been keeping Houston homes comfortable and efficient for 20 years — owner-led, every job.
Written by Scott Gray, Owner at Lone Star Air Duct Cleaning Service Houston, serving Houston since 2004.