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 Lewisville
Duct repair and sealing in Lewisville typically runs $280-$720 for most homes, with full-system sealing on older tract homes reaching the higher end when original duct board or flex runs need replacement. We’re the Duct Repair & Sealing team at CleanRun, and we serve Lewisville from our Dallas-Fort Worth office - crews are dispatched daily to neighborhoods from Old Town to the lakefront subdivisions along the western shore. Call (469) 452-7766 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Plano Is Lewisville’s Preferred Duct Repair & Sealing Company
We’ve been in Lewisville homes since 2013, and the pattern is consistent: a homeowner calls for duct cleaning, we run the camera, and find separated flex collars or mold-stained duct board that explains why the system never quite cools the back bedrooms. Our crews are background-checked and uniformed under Haven Standard Clause 3: Verified Crews, and every technician identifies by name before arrival.
Our reputation here is built on documentation, not promises. Every Lewisville job concludes with a photo record of every duct run, delivered as a standard deliverable - not an upsell. The 365-Day Done Right Promise applies in writing on every job, and we publish our license number on every page because credentials should be verifiable, not buried in a footer.
Calls are answered by a live person, 24/7. Scheduling to Lewisville is coordinated from our DFW office, and we don’t charge a premium for lakefront addresses or the older neighborhoods near Main Street.
Our Duct Repair & Sealing Services in Lewisville
Duct Sealing
Most Lewisville homes we inspect have leaks the homeowner never suspected. The black clay soil under slab-on-grade construction shifts with seasonal moisture changes, and that movement separates duct joints at the air handler, takeoffs, and register boots. We seal with mastic and reinforced tape at every joint, then verify with a smoke test. A typical duct sealing job in Lewisville runs $280-$450 for a single-system home. We quote the full price in writing before the first panel comes off.
Flex Duct Repair
Original flex duct from the 1980s and 90s is now 30-50 years old. The insulation sags, the inner liner tears at elbows, and collars pull loose from the plenum. In Lewisville’s lakefront neighborhoods, we see an additional failure mode: high attic humidity weakens the wire helix and outer vapor barrier, so the duct collapses or delaminates faster than in drier inland suburbs. Flex duct repair in Lewisville typically costs $180-$340 per run, depending on length and attic access. We photograph the damage before quoting replacement.
Metal Duct Repair
Some Lewisville homes, particularly those built in the 1970s before flex duct dominated, have galvanized steel trunk lines. These corrode at seams, separate at slip joints, and develop pinholes where condensation pools. Metal repair involves cutting out compromised sections, fabricating transitions, and sealing with mastic. Jobs range $320-$580. We use professional-grade equipment from Abatement Technologies and Guardsman - brands you can verify independently.
Duct Insulation
When Lewisville’s summer heat pushes attic temperatures past 140°F, uninsulated or degraded ductwork bleeds cooling capacity before the air reaches the register. We replace insulation with formaldehyde-free fiberglass wrap or closed-cell foam where appropriate, sealed at every seam. Typical insulation work runs $240-$480 for partial replacement, $680-$1,100 for full trunk and branch coverage. We specify the R-value and material in the written scope before work begins.
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 Lewisville
CleanRun crews carry professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, and Guardsman - trade-recognized brands we name so Lewisville homeowners can research what we’re using before agreeing to a price. We stock common flex duct diameters, collar fittings, and mastic compounds locally, which means most Lewisville repairs don’t wait on parts. For specialized metal fabrication or custom transitions, our Dallas-Fort Worth office maintains same-day supply relationships with regional HVAC distributors.
Common Duct Repair & Sealing Problems We See in Lewisville Homes
- Black mold on duct board liners in lakefront neighborhoods. The ~29,000 acres of Lake Lewisville keep attic relative humidity high enough that even a small gap at a flex collar becomes a condensation point. Homeowners run the system normally and still find mold - because the moisture source is geographic, not operational.
- Flex duct collars separated by soil movement. Lewisville’s expansive black clay shrinks and swells seasonally, stressing slab-on-grade foundations and pulling duct connections apart at the air handler and takeoffs. The gap pulls unconditioned attic air and fiberglass insulation straight into the supply stream.
- Delaminated duct board masking as a dust problem. Decades of 16-plus-hour summer runtimes bake pollen, construction dust, and cedar pollen into the porous surface of aging fiberglass duct board. The buildup looks like a cleaning issue, but the real problem is the degraded liner releasing particles the filter never catches.
- Sagging flex runs restricting airflow to back bedrooms. Original flex duct in Lewisville’s 1980s tract homes has lost tension at supports, creating low spots where condensation collects and airflow drops. The homeowner cranks the thermostat; the system runs longer; energy bills climb.
Pricing for Duct Repair & Sealing in Lewisville, TX
We publish ranges because Haven Standard Clause 1 requires a written price before any work starts - not after we’ve opened your system.
| Service | Typical Range in Lewisville |
|---|---|
| Duct sealing (single system, mastic + smoke test) | $280-$450 |
| Flex duct repair/replacement (per run) | $180-$340 |
| Metal duct repair (section replacement) | $320-$580 |
| Duct insulation (partial replacement) | $240-$480 |
| Duct insulation (full system) | $680-$1,100 |
| Mastic sealant application (full system) | $260-$420 |
What moves a job to the higher end: multiple attic access points, extensive mold remediation requiring antimicrobial treatment, or full duct board replacement in homes where the original material is too degraded to seal. We photograph everything, explain what we found, and deliver the written price before any repair begins. Free estimates. Free second opinion on any competitor’s written quote.
We Also Serve Cities Near Lewisville
Our crews work daily in Lewisville and the surrounding communities: Flower Mound to the west, Carrollton to the south, Plano to the east, and Richardson to the southeast. The same written-price guarantee, documented photo record, and 365-Day Done Right Promise apply in every city we serve.
Serving Lewisville, TX - Our Local Coverage Area
We’re based in the Lewisville 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 Lewisville
Your attic humidity is higher than you think. Lake Lewisville’s ~29,000 acres of open water keep ambient moisture elevated in lakeside neighborhoods, and even a pinhole gap at a flex duct collar creates a condensation point where mold colonizes the fiberglass liner. The system can run perfectly and still grow mold - the moisture source is geographic, not mechanical. We see this routinely in 1980s homes near the western shoreline. Call (469) 452-7766 and we’ll camera-inspect the damage, show you the photo evidence, and quote sealing or replacement in writing.
Yes. We pressurize the system and use a smoke pencil at registers and visible joints to identify leaks, then run a borescope camera through the duct runs to document separation points, mold, or debris buildup. No drywall comes down unless we find a problem that requires access, and we photograph everything so you see what we see before deciding on repair. The inspection itself is part of our standard estimate process - no separate charge.
It depends on the condition we find. If the duct board is structurally intact with surface mold or minor delamination, we can clean, treat, and seal it for $280-$450. If the liner is crumbling, saturated, or the board itself is sagging at supports, replacement with sealed metal or new duct board is the only durable fix - typically $680-$1,200 for a full plenum and trunk rebuild. We show you the camera footage and quote both options in writing before any cutting starts.
The expansive clay shrinks in drought and swells after rain, shifting slab-on-grade foundations and stressing duct connections at the air handler and takeoffs. We’ve found flex collars completely separated in Lewisville homes where the homeowner only noticed uneven cooling. The soil movement is seasonal and relentless, which is why we use reinforced mastic and mechanical clamps - not just tape - at every joint we repair. Call (469) 452-7766 for a free inspection if your system has never been sealed.
Yes, primarily because of Lake Lewisville’s humidity. We’re roughly 10 miles closer to that open water than Carrollton or Denton, and the difference shows up in attic moisture levels that accelerate mold growth and flex duct degradation. The housing stock is similar - 1970s-90s tract homes on slab foundations - but the lake effect means Lewisville duct jobs more often require microbial mitigation alongside mechanical sealing. Our crews carry antimicrobial treatments and moisture meters specifically for this pattern.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Plano, serving Lewisville since 2013.