Duct Repair & Sealing in Houston - Leakage Measured, Then Priced in Writing

Fast, Reliable Duct Repair & Sealing Across Houston

Duct repair and sealing in Houston typically costs $280-$750 for most residential jobs, with flex duct replacement running higher when multiple attic runs are involved. We dispatch crews from our Houston office and serve homeowners throughout Meyerland, Spring Branch, Westbury, and surrounding neighborhoods. Call (346) 421-3357 for a written estimate before any work begins.

Call (346) 421-3357

We’ve been in Houston attics since 2013. That means we’ve seen what happens when flex duct sits in 140°F summer heat for ten years straight, what Harvey left behind in Kashmere Gardens duct boots, and why a “simple cleaning” sometimes turns into a repair job once the camera goes in. Our Duct Repair & Sealing team doesn’t guess. We photograph every run, write the price before touching a tool, and leave you with a documented record.

Why CleanRun Air Duct Cleaning Sugar Land Is Houston’s Preferred Duct Repair & Sealing Company

CleanRun has served more than 52,000 homes since 2013, every one with a written price delivered before work started and a photo record delivered after. In Houston specifically, that means we’ve documented post-Harvey contamination in flood-zone duct systems, sagging flex runs in 1970s Spring Branch ranches, and the condensation damage that comes from running AC ten months a year in Gulf Coast humidity. Our 365-Day Done Right Promise applies here exactly as it does everywhere we work: if it’s not right, we make it right, in writing, under Haven Standard Clause 1.

Our technicians are background-checked, uniformed, and identified by name before arrival, per Haven Standard Clause 3: Verified Crews. We publish our license number on every page because credentials should be verifiable, not buried. Equipment on Houston jobs includes Rotobrush, Nikro, and Abatement Technologies systems - brands you can look up yourself before agreeing to any scope.

Tomas Reyes built this company on the premise that ductwork is invisible infrastructure, and invisible work demands visible proof. That’s why every job includes a Documented Photo Record of every duct run, before and after, delivered as a standard deliverable. Not an upsell. Not a courtesy. Part of the job record.

Our Duct Repair & Sealing Services in Houston

Flex Duct Repair

Houston’s dominant housing stock - 1970s through 2000s suburban construction in neighborhoods like Meyerland, Westbury, and Spring Branch - was built with flex duct routed through unconditioned attics. Summer attic temperatures exceed 140°F. The inner liner degrades. The wire helix relaxes. Sagging low spots form where condensation, dust, and debris pack into dense mats that restrict airflow and harbor microbial growth. We cut out failed sections, install new flex with proper support straps to prevent future sagging, and insulate to R-6 or higher to reduce condensation on the exterior jacket.

We pulled register covers in a 1972 Meyerland ranch and found flex duct runs collapsed into sagging low spots, plus dried Harvey-era silt packed into the duct boots at the supply and return ducts - the homeowner had replaced drywall after 2017 but never opened the duct system. Camera inspection confirmed a disconnected run above the master bedroom, so we rebuilt that section with new flex, re-insulated it, and sealed every joint with mastic before final HEPA filtration and negative pressure verification. Static pressure at the air handler dropped and airflow at the far registers came back.

Duct Sealing

In Houston, duct sealing is moisture control as much as it is air retention. The Gulf Coast humidity means any breach in a duct joint pulls 90% relative humidity outdoor air directly into the system, accelerating biological buildup in ways that drier Texas metros simply don’t experience. We seal supply and return plenums, trunk line connections, and register boots with mastic sealant (not tape - tape fails in attic heat) and verify with pressure testing. A typical Houston duct sealing job runs $280-$450 for a single-system home.

Metal Duct Repair

Older Houston homes, especially pre-1980 construction in neighborhoods like the Heights and Near Northside, sometimes have galvanized steel trunk lines with rusted seams or failed fiberglass liner. We repair separated seams, replace rusted sections, and re-line where the original insulation has degraded. Metal duct in Houston attics sweats just like flex - the temperature differential is the driver, not the material - so proper sealing and insulation are always part of the scope.

Duct Insulation

When we find flex duct with intact structure but degraded exterior insulation (the gray or silver jacket turned brittle and flaking), we re-insulate rather than replace. In Houston’s climate, this is often the right call. New insulation reduces exterior condensation, which reduces the moisture load that feeds mold growth inside the duct. We use insulation rated for 140°F+ attic exposure, properly sealed at all seams.

Mastic Sealant Application

Mastic is a water-based, fiber-reinforced sealant that remains flexible after curing - critical in Houston, where attic temperatures swing from 40°F winter mornings to 140°F summer afternoons. We brush mastic onto every joint, seam, and penetration after cleaning and before final verification. Tape alone fails; mastic endures. This is standard on every CleanRun sealing job, not an upgrade.

Air Leak Repair

Disconnected runs, crushed sections from storage activity in the attic, and failed connections at the plenum are common findings in Houston homes. We locate leaks with camera inspection and pressure testing, then repair with materials matched to the existing system. Every repair is photographed, and static pressure is measured before and after to confirm the fix.

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After

Trusted Brands We Service in Houston

CleanRun stocks parts and materials from Honeywell, Aprilaire, and Abatement Technologies for Houston jobs, with Nikro equipment on every truck. These are trade-recognized brands, not proprietary systems you can’t research. If your Houston home has an Aprilaire whole-home dehumidifier tied to the duct system, or a Honeywell media air cleaner upstream of the air handler, we service the integration - not just the ductwork in isolation. Parts availability means we complete most repairs in a single visit, with the written scope agreed before work starts.

Common Duct Repair & Sealing Problems We See in Houston Homes

• Flex duct sags into condensation-collecting low spots. In Houston’s 140°F attics, flex duct relaxes over years of thermal cycling. The sag becomes a trough where dust and moisture accumulate. Eventually the joint above the sag separates, and the system starts pulling 90% RH Gulf air straight into the supply side. We find this in Spring Branch and Westbury ranches built 1975-1995.
• Post-Harvey silt remains in flood-zone duct systems. In Meyerland, Kashmere Gardens, and parts of Greenspoint, technicians regularly pull register covers and find dried Harvey-era silt and organic debris compacted inside duct boots. Homeowners addressed visible drywall and flooring damage but never opened the duct system, leaving years of microbial material circulating through the living space every time the AC runs.
• Handyman tape repairs mask deeper failures. We see this across Houston: a crushed or disconnected run gets wrapped in foil tape, so the leak moves a few feet down the line and the blower motor keeps working against a restriction. The system runs longer, costs more to operate, and eventually fails. Camera inspection finds the real problem.
• Cold supply air meets hot attic metal, creating chronic condensation. Because Houston AC systems run effectively year-round, the temperature differential between 55°F supply air and 140°F attic surfaces creates persistent moisture on duct exteriors. Without proper insulation and sealing, that moisture migrates to the interior lining - a near-ideal environment for mold colonization that a drier climate wouldn’t produce.

Pricing for Duct Repair & Sealing in Houston, TX

We Also Serve Cities Near Houston

Our Houston office dispatches crews throughout the metro area, including Bellaire, Pearland, Stafford, and Fresno. The same written pricing, documented photo record, and 365-Day Done Right Promise apply in every service area.

FAQs - Duct Repair & Sealing in Houston