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 Dallas
Duct repair and sealing in Dallas typically runs $340-$890 for most residential jobs, with full flex duct replacement in a single system reaching $1,200-$2,400 depending on attic accessibility and the condition of existing runs. Our Duct Repair & Sealing crews dispatch from our Dallas-Fort Worth office and carry insulated flex duct, mastic sealant, and metal repair stock on every truck, so most Dallas homes are completed in a single scheduled visit. Call (940) 240-8552 for a written price before any work starts.
We’ve worked in Dallas attics since 2013. We know the difference between a 1968 Lakewood ranch with original duct board and a 2019 Preston Hollow build with flex duct that failed early because the installer skipped mastic on the boots. That local familiarity means we bring the right materials and don’t burn your morning with a return trip for parts.
Why CleanRun Air Duct Cleaning Lewisville Is Dallas’s Preferred Duct Repair & Sealing Company
Our reputation in Dallas is built on documentation, not promises. Every job starts with a written price delivered before a panel comes off, and every job ends with a Documented Photo Record of every duct run, before and after, delivered as a standard deliverable. Haven Standard Clause 1: no exceptions.
Tomas Reyes has led CleanRun since its founding in 2013. The 365-Day Done Right Promise is backed in writing on every Dallas job, not buried in a policy manual subject to manager approval. If the seal fails or the repair doesn’t hold, we make it right.
Calls are answered by a live person, 24/7, and technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. Dallas homeowners receive the technician’s name and photo before the truck leaves our dispatch.
We serve Dallas homes from our Dallas-Fort Worth coordination office. No out-of-town scheduling delays, no crews guessing at local code or climate conditions they’ve never encountered.
Our Duct Repair & Sealing Services in Dallas
Duct Sealing
Dallas duct sealing addresses the leaks that develop at joints, boots, and plenum connections after years of thermal cycling in 140-160°F attics. We pressurize the system, locate leaks with a smoke pencil or digital manometer, then seal with mastic sealant or metal-backed tape rated for HVAC use. A typical duct sealing job in Dallas runs $340-$620 for a single system. We don’t seal over flaking duct board or separated boots without surface prep, mastic applied to degraded liner peels within a cooling season.
Flex Duct Repair
Flex duct is the dominant material in Dallas homes built from 1985 forward, and it’s where we see the most heat-driven failure. The inner liner degrades, the insulation compresses, and the vapor barrier tears where it contacts truss nails or sits in pooled attic condensation. Flex duct repair in Dallas typically costs $180-$340 per run for accessible replacement, or $620-$1,200 when multiple runs in a system have failed. We use insulated flex duct with a rated vapor barrier, not the thin-wall product some installers pull from big-box stock.
Metal Duct Repair
Older Dallas homes in neighborhoods like Oak Cliff and Kessler Park retain galvanized steel ductwork from original construction. Metal duct doesn’t flake like duct board, but seams separate and rust-through develops where condensation collects in low spots. Metal duct repair runs $280-$540 per section in Dallas, with full replacement of a deteriorated trunk line reaching $890-$1,400. We seal metal seams with mastic and mechanical fasteners, not tape alone.
Duct Insulation
When Dallas attics hit 140°F, uninsulated or degraded duct insulation costs measurable efficiency loss. We install closed-cell insulation wraps or replace insulated flex duct where the original R-value has compressed to nothing. Duct insulation work in Dallas ranges from $240 for partial wrap to $780 for full system re-insulation on accessible trunk lines.
Mastic Sealant Application
Mastic is the only sealant we apply to Dallas ductwork. It’s a water-based compound that remains flexible after curing, bridging gaps up to 1/8 inch on metal and properly prepared duct board. We do not use duct tape as a primary sealant, it dries and fails in attic heat. Mastic application as a standalone service runs $280-$480 in Dallas; as part of a larger repair, it’s included in the written scope.
Air Leak Repair
Air leaks in Dallas systems typically occur at the plenum, where the air handler connects to the duct trunk, or at register boots that have separated from ceiling drywall. These leaks pull 140°F attic air directly into the supply stream or blow conditioned air into the insulation. Repair costs run $180-$420 depending on access and whether the boot requires reconstruction.
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 Dallas
Our equipment roster includes Rotobrush agitation systems, Nikro negative-air machines, and Honeywell and Aprilaire air quality components. We stock mastic sealant, insulated flex duct, and metal repair fittings on every Dallas truck, sourced from trade suppliers, not retail. That inventory means we don’t mark up your job with a “parts run” charge or reschedule because your 1978 duct board boot size isn’t in the van.
Common Duct Repair & Sealing Problems We See in Dallas Homes
- Thermal cycling destroys flex duct liners decades early. Because Dallas homes have no basements, virtually every duct run sits in attics that hit 140-160°F in July, and that thermal cycling turns 1970s duct board and early flex duct liners friable and flaky decades sooner than ducts in conditioned or semi-conditioned spaces. What fails here first is the duct material itself, not just the joints.
- Separated boots pull raw attic insulation into the airstream. In established neighborhoods like Lake Highlands and Oak Cliff, technicians routinely open 1970s-era duct board systems and find the interior liner friable and actively flaking fiberglass. Because the boots separated years ago in the attic heat, the system has been pulling raw blown-in attic insulation directly into the living-space airstream, sometimes for a decade or more without the homeowner realizing it.
- Cedar fever and dust storms load ducts with fine particulate. Dallas sits squarely in the path of mountain cedar pollen from December through February, and periodic West Texas dust storms push fine Blackland Prairie clay particulates through return-air systems. If joints and boots have separated, that load bypasses the filter and deposits directly in the ducts and air handler.
- Mastic applied without surface prep fails within a season. Mastic sealant applied over dirty, flaking duct board or loose boots fails to bond. Without source removal and surface prep, the seal peels and leaks return within a cooling season, pulling attic air back into the system. We see this on competitor “seal only” jobs where the crew skipped the prep step to hit a coupon price.
Pricing for Duct Repair & Sealing in Dallas, TX
| Service | Typical Dallas Range |
|---|---|
| Duct sealing (single system) | $340 - $620 |
| Flex duct repair (per run) | $180 - $340 |
| Flex duct replacement (full system) | $1,200 - $2,400 |
| Metal duct repair (per section) | $280 - $540 |
| Duct insulation (partial to full) | $240 - $780 |
| Mastic sealant application | $280 - $480 |
| Air leak repair (boot/plenum) | $180 - $420 |
What moves a Dallas job toward the higher end: multiple attic access points, failed duct board requiring full replacement rather than sealing, systems with more than 12 runs, or 1960s-1980s homes where original materials have degraded past repair. We deliver the written price before any work starts, every time, under Haven Standard Clause 1. Free estimates. Call (940) 240-8552.
We Also Serve Cities Near Dallas
Our crews work throughout the Metroplex, including Dallas proper plus Irving, Richardson, Carrollton, and Plano. Dispatch and scheduling are coordinated from our Dallas-Fort Worth office, so response times to these surrounding cities remain consistent with our Dallas service area.
Serving Dallas, TX - Our Local Coverage Area
We’re based in the Dallas 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 Dallas
No. Fogging treatments are not source removal and do not address the debris, degraded liner, or separated joints that actually cause Dallas duct problems. The NADCA standard requires mechanical agitation and negative-pressure extraction to remove contaminants, fogging deposits a chemical layer on top of them. In Dallas’s heat-driven failure environment, the issue is typically physical degradation and attic dust infiltration, not microbial growth requiring biocide. We photograph the inside of every run before and after so you can verify what was removed, not masked. Call (940) 240-8552 for a written estimate on genuine source removal and sealing.
Dallas’s combination of no-basement construction, 140-160°F attic temperatures, and six-to-seven-month continuous cooling seasons creates thermal stress that degrades flex duct liners and duct board decades sooner than in markets with conditioned crawl spaces or basements. The Blackland Prairie clay soil prevents basements, so every duct run routes through unconditioned attic space. That brutal cycling is the primary failure driver here, not humidity or salt air as on the Gulf Coast. Call (940) 240-8552 for an inspection of your specific system.
It depends on the liner condition. If the interior duct board surface is intact and the boots are secure, sealing with proper surface prep and mastic is viable, typically $340-$620. If the liner is friable and actively flaking, as we commonly find in Lake Highlands and similar 1970s Dallas neighborhoods, replacement is the only option that stops fiberglass shedding into the airstream. We determine this with camera inspection, not guesswork, and show you the photo before quoting either approach. Call (940) 240-8552 for a free inspection.
Mountain cedar pollen from December through February loads Dallas return-air systems with fine particulate at rates most northern markets never see. If your duct joints and boots are intact, the filter captures most of this load. If seals have failed, cedar pollen and clay dust bypass the filter and deposit directly in the duct runs and air handler, accelerating contamination and potentially aggravating respiratory sensitivity. Proper duct sealing prevents this bypass. Call (940) 240-8552 for a pressure test and leak location.
Real duct cleaning, per NADCA standards, includes mechanical agitation to dislodge debris, negative-pressure extraction to remove it, and camera verification of every run. What is not worth paying for: fogging “sanitiser” upsells that deposit chemicals without removing source contamination, per-vent pricing schemes that incentivize rushed work, and any service that cannot show you before-and-after photos of your own ducts. CleanRun’s Documented Photo Record, included on every visit since 2013, shows exactly what was in your ducts and what was removed. Call (940) 240-8552 for a written price on genuine source removal and sealing.
Ready to stop breathing attic insulation? Call CleanRun at (940) 240-8552 for a free estimate with a written price delivered before any work starts. Every Dallas job is backed by the 365-Day Done Right Promise and includes a Documented Photo Record of every duct run.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Dallas since 2013.