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 Greatwood
Duct repair and sealing in Greatwood, TX typically runs $280-$680 for most homes, with flex duct replacement on a single run starting around $340 and whole-system mastic sealing ranging from $450-$920. We’re usually in Greatwood within two business days of your call, scheduling from our Houston office but dispatching crews who know the community’s streets and attic layouts. Call (346) 666-7165 and we’ll put a written price in your hand before any panel comes off.
We’ve worked Greatwood since 2013. We know the golf course sections, the Brazos River corridor builds, and the later phases near FM 762. Our technicians carry Rotobrush inspection cameras and mastic sealant rated for Fort Bend County’s attic conditions. Every job starts with a written scope and price under Haven Standard Clause 1, and ends with a Documented Photo Record of every duct run we touched.
Why CleanRun Air Duct Cleaning Katy Is Greatwood’s Preferred Duct Repair & Sealing Company
Greatwood’s not a drive-by market for us. We’ve served enough homes here that our crews recognize the construction patterns - the late-1980s flex duct in the river corridor, the mid-1990s two-stories near the golf course, the early-2000s builds on the east side. That familiarity matters when you’re tracing a supply run through a 140°F attic and need to know where the original builder likely put the junction.
Our reputation in Greatwood is documented, not claimed. Every customer receives the photo record, the written scope, and the 365-Day Done Right Promise in writing before we leave. Tomas Reyes established this standard in 2013, and it applies to every home we enter, whether it’s a $280 seal job or a $2,400 flex duct replacement.
Calls are answered by a live person, 24/7. Technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. We don’t subcontract. The crew who quotes your job does your job.
We coordinate scheduling from our Houston office, but our trucks carry the parts and equipment to complete most Greatwood repairs on the first visit. No waiting on flex duct or mastic orders.
Our Duct Repair & Sealing Services in Greatwood
Duct Sealing
Most Greatwood homes we inspect have builder-grade connections - taped collars, unsealed plenum joints - that were never mastic-sealed at handover. The tape dries and lifts within 5-10 years in Fort Bend’s attic heat. We remove failed tape, clean the joint surface, and apply mastic sealant (the thick, paste-like compound that hardens into a permanent airtight bond) at every connection point. A typical Greatwood two-story with 12-16 supply runs runs $450-$720 for full mastic sealing. We verify with a smoke pencil or blower door test before we leave.
Flex Duct Repair
Flex duct - the insulated flexible tubing that routes conditioned air through Greatwood’s attics - has a design life of 20-25 years in Texas conditions. Greatwood’s build-out was compressed between the late 1980s and early 2000s, so entire streets hit end-of-life simultaneously. In the earliest sections along the Brazos River corridor, we routinely find late-1980s flex duct where the inner mylar liner has cracked or delaminated and the outer insulation wrap has compressed flat. The duct looks connected from the attic hatch. It moves almost no air. Camera inspection or a blower door test reveals the truth. Single run replacement in Greatwood: $340-$580. Multiple runs: $680-$1,400.
Metal Duct Repair
Some Greatwood homes, particularly custom builds near the golf course, used galvanized metal trunk lines with flex duct branches. Metal ducts don’t degrade like flex, but their seams and joints are failure points. We seal metal seams with mastic and fabric reinforcement, repair corroded sections with matching gauge metal, and insulate where condensation forms. Metal repair in Greatwood typically runs $380-$850 depending on accessibility and extent.
Duct Insulation
When we replace flex duct in Greatwood’s 140°F attics, we specify R-6 or R-8 insulation minimum - higher than what was installed in the 1990s. For metal trunk lines, we add closed-cell insulation wrap at damaged sections. Insulation replacement tied to repair work: $180-$340 per run. Stand-alone insulation upgrades: $420-$780 for typical Greatwood systems.
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 Greatwood
Our trucks stock Guardsman flex duct, Honeywell zone dampers, and Rotobrush inspection cameras - equipment you can look up before we arrive. We don’t show up hoping to find parts. For Greatwood’s concentration of aging 1990s systems, that preparation matters. A crew that has to order mastic or flex duct diameter mid-job leaves your attic open and your system down. We carry the common sizes for Greatwood’s 2,500-4,500 sq ft homes: 6-inch, 8-inch, 10-inch, and 12-inch flex duct, plus transition fittings for the plenum connections we see in this market. Turnaround on standard repairs is same-visit. Specialty Honeywell zone components, if needed for integrated systems near the golf course, typically arrive within 24 hours.
Common Duct Repair & Sealing Problems We See in Greatwood Homes
- Construction debris in new handovers. Even homes built in Greatwood’s final phases carry drywall grit, framing sawdust, and stucco sand in the supply and return ducts. The builder’s rough clean is a shop vac at the registers, not a negative-pressure extraction of the full duct run. That debris loads the blower motor and clogs coils before the first summer.
- Heat-cycled flex duct failure. Fort Bend County attics exceed 140°F regularly in summer. Twenty-five years of that heat cycling cracks the inner mylar liner and compresses the fiberglass insulation wrap on Greatwood’s 1980s and 1990s flex duct. The duct stays in place. It stops moving air.
- Condensation-driven microbial growth. Dew points above 70°F for five-plus months mean every short-cycle of an oversized AC system (common in large Texas tract homes) creates condensation inside attic ductwork. Persistent moisture degrades mastic sealant at joints and promotes buildup that camera inspection reveals.
- Failed builder-grade connections. The original taped collars and unsealed plenum joints in Greatwood’s production homes leak at the air handler and registers, pulling 140°F attic air into the system. No MERV rating at your filter can compensate for unsealed return plenums.
Pricing for Duct Repair & Sealing in Greatwood, TX
Here’s what duct repair and sealing costs in the Greatwood market, based on jobs we’ve completed here:
| Service | Typical Range |
|---|---|
| Mastic sealing (whole system, 12-16 runs) | $450-$720 |
| Single flex duct run replacement | $340-$580 |
| Multiple flex duct runs (2-4) | $680-$1,400 |
| Metal duct repair/sealing | $380-$850 |
| Duct insulation replacement (per run) | $180-$340 |
| Blower door test with full diagnostic | $280-$420 |
What moves you within these ranges: attic accessibility (tight trusses add labor), number of connections to seal, and whether we find secondary damage (water-stained insulation, collapsed runs) once the camera goes in. We quote the full scope in writing before work starts - Haven Standard Clause 1. No per-vent pricing. No add-ons after the van is in your driveway. Free estimates. Call (346) 666-7165.
We Also Serve Cities Near Greatwood
Our crews work Greatwood regularly and also serve Katy, Cinco Ranch, Brookshire, and Mission Bend from the same dispatch. If you’re near the border of these service areas, we’ll confirm coverage when you call. Our Duct Repair & Sealing hub page has more detail on methods and equipment.
Serving Greatwood, TX - Our Local Coverage Area
We’re based in the Greatwood 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 Greatwood
Builder-grade ductwork in new Greatwood homes is rarely mastic-sealed at the plenum or register connections, and construction debris - drywall grit, framing sawdust, stucco sand - typically remains in the ducts at handover. We recommend a camera inspection before your first summer to document what’s actually in the system and whether the builder’s taped connections are already lifting in Fort Bend’s attic heat. Call (346) 666-7165 for a written estimate - no charge.
You can’t, reliably. The failure mode we see most in Greatwood’s 1980s and 1990s flex duct - inner mylar liner delamination and compressed insulation wrap - leaves the duct physically in place but functionally blocked. The only verification methods are camera inspection down the full run or a blower door test measuring actual airflow at the register. We include camera documentation on every visit. If your upstairs bedrooms won’t hold setpoint while the downstairs over-cools, that’s the symptom to watch for.
Fort Bend County’s dew points above 70°F for five-plus months create real, measurable condensation inside attic ductwork whenever your AC short-cycles - which oversized systems in large Greatwood homes do frequently. That moisture degrades mastic sealant, promotes microbial buildup, and in extreme cases collapses insulation wrap. It’s not theoretical. Our cameras document it. The fix is proper system sizing (an HVAC contractor’s job) plus sealed, insulated ductwork that doesn’t sweat.
We arrive with a written price already agreed to, inspect every accessible duct run with a Rotobrush camera, photograph the condition, perform the repair or sealing work specified in your scope, then photograph again and deliver the Documented Photo Record before we leave. For mastic sealing, we remove failed tape, clean joints, apply sealant, and verify with a smoke pencil. For flex duct replacement, we size, cut, and suspend new duct with proper slope and support. The 365-Day Done Right Promise covers every step in writing.
The ductwork itself is the component we repair, but integrated zone dampers - common in larger Greatwood homes near the golf course - affect how we balance airflow after sealing or replacement. We stock Honeywell zone components and Guardsman duct materials so repairs are compatible with your existing system. If your home has a proprietary zone board, we identify it during camera inspection and confirm parts availability before quoting. No surprises after work starts.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Greatwood since 2013.