Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Duct Repair & Sealing Across Missouri City
Duct repair and sealing in Missouri City typically costs $280-$650 for most residential jobs, with flex-duct replacement running higher when multiple runs are involved. Our crews are dispatched from our Houston office and carry Rotobrush and Nikro equipment to Missouri City daily - we know the difference between a Sienna master-planned home built in 2005 and a Quail Valley ranch from 1978, and we treat them accordingly. Call (346) 251-8919 for a written estimate before any work starts.
Missouri City’s housing stock tells two stories. West of Highway 6, you’ll find 1970s through 1990s tract homes with flex-duct HVAC runs through unconditioned attics, many now 35-45 years old. East toward Sienna, the late-1990s through 2010s construction used similar flex-duct materials that are hitting their service-life ceiling simultaneously. Both situations create the same problem: conditioned air leaking into attics, humid outdoor air pulling into the system, and energy bills that climb every summer without explanation. Our Duct Repair & Sealing team documents every run with before-and-after photography so you can see exactly what was failing and what we fixed.
Why CleanRun Air Duct Cleaning Houston Is Missouri City’s Preferred Duct Repair & Sealing Company
We’ve served Missouri City since adding Fort Bend County to our route schedule in our early years. The 52,000+ homes in our job history include hundreds in the Quail Valley, Hunters Glen, and Sienna subdivisions - enough that our technicians recognize the specific failure patterns without walking through the door. Our documented photo record is included on every visit, not offered as an upgrade. Haven Standard Clause 1 requires a written price before any work starts; there is no “call for pricing” in our process.
Our Missouri City customers leave reviews mentioning the same things: the technician showed them the camera footage before quoting, the written price matched the final invoice, and the photo record arrived by email before the truck left the driveway. We’re independently owned and operated under the Haven Standard, not a franchise, and our 365-Day Done Right Promise is backed in writing on every job - not a policy subject to manager approval, but a guarantee signed by Tomas Reyes.
Calls are answered by a live person, 24/7, and our background-checked, uniformed technicians are identified by name before arrival. Scheduling is coordinated from our Houston office, with crews serving Missouri City locally. We also offer a Free Second Opinion on any written estimate from a competitor - bring us the quote, and we’ll put our number next to it in writing.
Our Duct Repair & Sealing Services in Missouri City
Flex Duct Repair
Missouri City’s original flex-duct systems in Quail Valley and Hunters Glen are now 35-45 years old, well past their 15-25 year design life. The inner plastic liner crumbles in 130-140°F attic heat, and the fiberglass insulation layer compresses or detaches. We replace failed runs with new flex duct sized to the original Manual D specification, support it with proper strapping to prevent sagging, and mastic-seal every connection. In Sienna homes, we also address flex duct that has been crimped or disconnected by slab movement over Fort Bend County’s expansive clay soils.
Mastic Sealant Application
Air leaks at duct joints and boots pull humid outdoor air into your system year-round in Missouri City, where dew points stay above 70°F for months. We brush-apply water-based mastic sealant - not duct tape, which fails in attic heat - to every joint, boot, and plenum connection after repair work is complete. The sealant cures to a flexible, durable finish that withstands thermal cycling. This is standard on every duct repair we perform in Missouri City, not an add-on.
Metal Duct Repair
Older Missouri City homes with galvanized steel ductwork, particularly some Quail Valley properties with additions or renovations, develop rust at seams and separations at slip joints. We cut out corroded sections, fabricate replacement pieces, and seal with mastic and mechanical fasteners. Where metal duct runs through unconditioned spaces, we assess whether insulation replacement is also needed - the original wrap often degrades after decades of Gulf Coast humidity.
Duct Insulation Replacement
Missouri City’s attic conditions destroy duct insulation. The foil-facing delaminates, the fiberglass compresses, and the R-value drops to near zero. We install new insulation with proper vapor barriers, paying special attention to Sienna-area homes where groundwater humidity wicks into crawl-space chases and pier-and-beam additions. The insulation we use is rated for the temperature extremes and humidity levels this region produces - not the generic product you’d find at a hardware store.
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.
BeforeAfterTrusted Brands We Service in Missouri City
Our equipment roster includes Rotobrush agitation systems for source removal, Nikro negative-pressure extractors, Honeywell media air cleaners, and Aprilaire whole-home humidification and dehumidification components. We stock common flex-duct diameters, mastic sealant, and insulation materials for Missouri City jobs, so most repairs are completed in a single visit without waiting on parts. Customers can verify every brand independently - we name them specifically because we have nothing to hide about what goes into your home.
Common Duct Repair & Sealing Problems We See in Missouri City Homes
- Collapsed flex-duct liners in Quail Valley and Hunters Glen attics. The original 1980s flex duct has reached end of life. The inner liner crumbles to dust when disturbed, and the wire helix corrodes. Homeowners notice weak airflow at distant registers and rooms that never reach set temperature.
- Post-Harvey mold in duct systems that “looked fine.” Many Missouri City homes along Oyster Creek and in Sienna-area drainage corridors took water during Hurricane Harvey in 2017. Remediation contractors cleaned visible surfaces but often missed duct interiors. We find black mold growth on insulation facing inside chases that showed no external damage - the musty AC smell is the only symptom.
- Disconnected boots and joints from soil movement. Fort Bend County’s expansive clay soils shift with moisture, cracking slabs and moving framing. Duct boots pull away from drywall, and flex-duct joints separate at the collar. The system loses 20-30% of conditioned air into the attic or wall cavity.
- Chronic condensation on supply registers. When attic ducts leak cool air into a 140°F space, or when humid outdoor air pulls into the return, the temperature differential at the register causes persistent condensation. In Missouri City’s climate, this never dries - it feeds mold colonies that recirculate through the living space all summer.
Pricing for Duct Repair & Sealing in Missouri City, TX
A typical mastic sealant and joint repair job in Missouri City runs $280-$420 for a single system. Flex-duct replacement for one or two runs ranges $340-$580 depending on attic accessibility and diameter. Full duct system replacement in a Quail Valley or Hunters Glen home with multiple failed runs typically falls between $1,800-$3,200. Duct insulation replacement adds $180-$340 per run.
What moves the price: the number of runs involved, whether the attic requires protective decking to access safely, and whether mold remediation is needed before new materials can be installed. We deliver a written price before any work starts, every time, under Haven Standard Clause 1. No per-vent pricing, no teaser coupon that triples once we’re in your home. Call (346) 251-8919 for a free estimate - we’ll inspect, photograph, and quote in writing.
We Also Serve Cities Near Missouri City
Our crews work Duct Repair & Sealing in Missouri City and the surrounding communities regularly: Stafford to the north, Sugar Land to the northeast, Fresno to the southwest, and Bellaire to the east. The same written-price, documented-photo standard applies regardless of zip code.
Serving Missouri City, TX - Our Local Coverage Area
We’re based in the Missouri City 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 Missouri City
At 35-45 years old, Quail Valley flex duct is past replacement age, not repair age. We can seal joints and patch isolated damage, but if the inner liner is crumbling or multiple runs show collapse, replacement is the only lasting fix. We photograph every run and show you the condition before quoting either approach. Call (346) 251-8919 for an inspection and written options.
Even homes that never officially flooded can harbor mold in duct insulation. Sienna’s proximity to the Brazos River floodplain means high groundwater and soil moisture wick humidity into crawl-space chases and pier-and-beam additions year-round. The black mold grows on the insulation facing, not in the living space where you’d see it. Our camera inspection finds it; a fogging sanitizer does not remove it - source removal with agitation and negative-pressure extraction does. Call (346) 251-8919 for a camera inspection.
No. Fogging deposits chemical on surfaces but does not remove mold colonies, debris, or moisture from porous duct insulation. In Missouri City’s climate, the remaining mold resumes growth within weeks. We perform source removal with agitation tools under negative pressure with HEPA filtration - the debris is extracted, not covered. The photo record shows the difference. Call (346) 251-8919 if you’ve already paid for fogging and the smell returned.
Fort Bend County’s expansive clay soils shift with seasonal moisture changes, moving slabs and framing enough to pull duct boots away from drywall and separate flex-duct collars. Mastic sealant alone won’t hold if the mechanical connection is stressed. We re-secure boots with proper fasteners, relieve strain on flex-duct runs, and then seal with mastic. Call (346) 251-8919 for a permanent fix, not repeated callbacks.
The distinction matters less than the solution - both require source removal, not fogging. Harvey-era contamination often appears in specific chase locations tied to water intrusion paths, while humidity-driven mold is more diffuse across attic runs. Our camera inspection maps the pattern, and the photo record documents it. Either way, the 365-Day Done Right Promise applies. Call (346) 251-8919 for inspection and written scope.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Missouri City since 2013.