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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Repair & Sealing Across Four Corners
Duct repair and sealing in Four Corners typically runs $280-$650 for most homes, with full flex duct replacement reaching $900-$1,400 when runs have failed at multiple joints. We’re the Duct Repair & Sealing in Four Corners crew that homeowners call when the AC runs nonstop but rooms stay uneven, or when a camera inspection shows what 10-20 years of builder-grade flex duct and Houston humidity have done inside the attic. Our scheduling desk is in Houston, and crews serving Four Corners carry mastic sealant, flex duct stock, and Rotobrush agitation equipment on every truck. Call (346) 666-7165 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Katy Is Four Corners’s Preferred Duct Repair & Sealing Company
We’ve worked in Four Corners since the community’s build-out years, and the pattern is consistent: homes built during the 2000s-2010s Fort Bend County boom carry builder-grade flex duct that is now hitting its failure window. Our crew knows the difference between a quick seal and a full run replacement because we’ve photographed the inside of hundreds of Four Corners duct systems. The photo record goes to the homeowner every time, no exceptions.
Four Corners customers find us through referral and repeat calls from neighbors on the same street. Reviews from this community emphasize the written price delivered before work starts and the documented photo record showing what was actually found. Our response time to Four Corners is same-week scheduling, with most repair and sealing jobs completed in a single visit once the scope is confirmed.
Local knowledge matters here because Four Corners isn’t a generic suburb. The slab-on-grade construction, attic-routed ductwork, and specific history of Hurricane Harvey flooding in lower-lying sections mean standard HVAC service protocols often miss what’s actually failing. We know which Four Corners neighborhoods took water in 2017, and we know what that moisture did to duct lining that was never properly dried.
Our Duct Repair & Sealing Services in Four Corners
Duct Sealing
Most Four Corners homes lose 20-30% of conditioned air through leaks at joints, plenum connections, and register boots before it ever reaches the living space. Our duct sealing service uses mastic sealant, not tape, because tape fails in 140°F attic heat within two to three years. We pressurize the system, locate every leak with a smoke pencil or digital manometer, then seal each joint with brushed mastic rated for HVAC applications. A typical whole-system seal in Four Corners runs $280-$450 for a single-zone home, $480-$650 for dual-zone systems common in the larger tract builds near FM 1093.
Flex Duct Repair
Flex duct repair is the core of our Four Corners work. Builder-grade flex installed during the 2000s-2010s is now 10-20 years old, and the inner liner sags, the insulation compresses, and the wire helix corrodes in humid attic conditions. We don’t patch over failed flex; we cut out the damaged section and splice in new duct with proper supports and sealed collars. A single run replacement in Four Corners runs $180-$340. Multiple runs or trunk-line damage pushes toward $700-$1,100. In Trailside Village, our crew ran camera inspection on a 2008 home whose attic-routed flex duct had separated at the trunk joint; mastic sealant and a Rotobrush agitation pass restored airflow to the supply and return ducts, and the homeowner canceled their repeat AC repair calls.
Metal Duct Repair
Metal ductwork in Four Corners is less common but appears in some custom builds and in plenum connections where flex meets the air handler. Metal fatigue, rust at seams, and separated drive cleats are the usual failures. We repair with proper sheet metal screws, sealed with mastic, or replace sections when corrosion has penetrated. Metal repair in Four Corners typically falls between $220-$480 depending on accessibility and extent.
Duct Insulation
When flex duct insulation has compressed or gotten wet, the R-value drops and condensation forms on the exterior, dripping into ceilings and wall cavities. In Four Corners’s humid climate, this is a recurring issue in homes that took moisture during Harvey or have chronic attic humidity. We replace insulation with proper vapor-barrier sleeve or full duct replacement when the inner liner is compromised. Insulation work runs $150-$320 per run, or $600-$900 for whole-system re-insulation.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in Four Corners
Our trucks stock parts and materials from Abatement Technologies, Guardsman, and Aprilaire, among others, so Four Corners jobs don’t wait on supply runs. We use Rotobrush agitation equipment for mechanical cleaning of duct lining before sealing, and we specify manufacturer-rated mastic and sealants for every joint. If your Four Corners home has Aprilaire whole-home air quality equipment integrated with the duct system, we repair and seal around those components without disrupting the factory calibration. Parts availability means most sealing and repair jobs finish in one visit.
Common Duct Repair & Sealing Problems We See in Four Corners Homes
- Harvey-era moisture trapped under mastic at flex duct joints in lower-lying Four Corners sections. Surface remediation after 2017 missed the mold colony growing inside the duct lining. We find this with camera inspection, and it requires source removal plus HEPA filtration, not just a seal-over.
- Builder-grade flex duct sagging at 10-20 years pulls joints apart in 140°F attics. The wire helix fatigues, the duct drops onto insulation or framing, and conditioned air leaks into the attic before reaching the registers. Sealing alone won’t fix sagging; we re-support and replace failed sections.
- Sustained 75%+ humidity cycling colonizes duct lining with mildew that standard HVAC service never touches. A seasonal tune-up checks the coil and blower, not the interior of the duct run. Only full source removal with mechanical agitation and negative-pressure extraction clears the biological load.
- Disconnected or crushed duct runs found during cleaning that the homeowner never knew existed. In Four Corners’s slab-on-grade builds, ducts run through attics with tight turns and framing contact. We’ve found runs completely separated at couplings, blowing conditioned air into attic space for years while rooms stay hot.
Pricing for Duct Repair & Sealing in Four Corners, TX
We publish ranges because Haven Standard Clause 1 requires a written price before any work starts. Here’s what duct repair and sealing costs in the Four Corners market:
| Service | Typical Range |
|---|---|
| Whole-system duct sealing (single zone) | $280-$450 |
| Whole-system duct sealing (dual zone) | $480-$650 |
| Single flex duct run repair/replacement | $180-$340 |
| Multiple run repair (2-4 runs) | $480-$780 |
| Metal duct repair (plenum, trunk section) | $220-$480 |
| Duct insulation replacement (per run) | $150-$320 |
| Full system flex duct replacement | $900-$1,400 |
What moves the price: accessibility in the attic, number of zones, whether the plenum itself has separated from the air handler, and whether mold remediation is required before sealing can be effective. We inspect with a camera, show you the photo record, and deliver the written price before any repair begins. Estimates are free. Call (346) 666-7165.
We Also Serve Cities Near Four Corners
Our crews work throughout Fort Bend and western Harris County, including Four Corners, Katy, Cinco Ranch, Brookshire, and Mission Bend. Dispatch and scheduling are coordinated from our Houston office, with local crews serving each area. The same written-price protocol, documented photo record, and 365-Day Done Right Promise apply in every community.
Serving Four Corners, TX - Our Local Coverage Area
We’re based in the Four Corners 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 Four Corners
The flex duct joints separate first, usually at the trunk connection or at the first elbow where the run drops to the register. The wire helix fatigues after 10-15 years of heat cycling, the inner liner sags, and the joint tape dries out in attic temperatures that exceed 140°F. Call (346) 666-7165 and we’ll camera-inspect to show you exactly where your system stands.
Yes, and we find it regularly. Surface remediation of walls and flooring often missed the ductwork entirely, and Houston’s sustained humidity kept latent moisture active inside flex duct lining. The camera shows active mold colonies that standard HVAC service never addresses. We document with photos, quote source removal and HEPA filtration in writing, and seal only after the biological load is cleared.
It depends on what the camera shows. Sealing works when the flex is structurally sound and only the joints have leaked. Replacement is necessary when the inner liner has sagged, the insulation has compressed, or mold has compromised the material. We don’t guess; we photograph every run and show you the condition before quoting either approach.
Four Corners’s housing stock is uniformly 10-20 years old, built with builder-grade flex during the Fort Bend boom, and routed through unconditioned attics in a subtropical climate. That combination - aging material, extreme heat, and relentless humidity - accelerates joint failure and biological growth faster than in communities with older metal duct or basement routing. Sealing here isn’t maintenance; it’s corrective work on systems hitting their designed failure window simultaneously.
Uneven temperatures room to room, AC running longer than it used to, dust accumulation at registers, or musty odor when the blower starts. Higher-than-expected electric bills in summer are another indicator - you’re paying to cool the attic through leaking joints. If you see any of these, call (346) 666-7165 for a free camera inspection and written estimate.
Ready to see what’s actually inside your ductwork? Call CleanRun Air Duct Cleaning Katy at (346) 666-7165. We’ll schedule a camera inspection, show you the photo record, and deliver a written price before any sealing or repair work begins. Every job is backed by our 365-Day Done Right Promise and the full H.A.V.E.N. Standard, including Haven Standard Clause 3: Verified Crews - background-checked, uniformed technicians identified by name before arrival.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Katy, serving Four Corners since 2013.