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 Flower Mound
Duct repair and sealing in Flower Mound typically runs $280-$680 for most residential jobs, with flex duct replacement at the higher end and targeted mastic sealing at the lower. Most repairs are completed in a single visit, and every job starts with a written price before any panel comes off. Call (682) 297-4068 for a free estimate.
We serve Flower Mound from our Dallas-Fort Worth office, with crews running the FM 2499 corridor daily. That familiarity matters. We know which subdivisions carry which builder-grade flex duct, where the attic access hatches are in Lakeside two-stories, and why a crushed run near a joist crossing in Wellington shows up as weak airflow at the upstairs registers. Our Duct Repair & Sealing team doesn’t guess. We photograph the inside of every duct run before touching it, quote the repair in writing, and deliver a documented photo record when we leave.
Why CleanRun Air Duct Cleaning Irving Is Flower Mound’s Preferred Duct Repair & Sealing Company
We’ve worked in Flower Mound homes since 2013. That’s not longevity theatre - it’s repeated exposure to the same failure patterns in the same housing stock, which means faster diagnosis and fewer return trips.
Our crews carry documented photo records from over 52,000 homes served, and Flower Mound jobs make up a significant share of our Denton County work. Homeowners here research before calling. They want to see what was found, not hear how dirty it felt. We show them.
Haven Standard Clause 3: Verified Crews. Every technician is background-checked, uniformed, and identified by name before arrival. No exceptions. The license number is published on this page, not buried in a footer.
Response time to Flower Mound is same-day or next-day for standard scheduling. We don’t manufacture urgency. Duct repair is a scheduled job, and we treat it that way.
Our Duct Repair & Sealing Services in Flower Mound
Flex Duct Repair
Flower Mound’s subdivisions - Wellington, Lakeside, Stone Hill Farms - are filled with the stuff. Flex duct installed between 1995 and 2010 degrades predictably: the inner liner tears, insulation compresses, and the spiral wire support corrodes or kinks at joist crossings. We replace failed sections with properly supported, correctly sized flex runs, not tape jobs over the outside of a crush. Our field crews budget extra attic access time on FM 2499 corridor jobs because we’ve seen the pattern enough to know what’s coming.
Mastic Sealant Application
Tape fails. In Flower Mound’s humid attics, it fails faster. Lake-effect humidity from Grapevine Lake keeps attic relative humidity elevated for months, accelerating the separation of taped joints on plenums, boots, and flex connections. We remove failed tape and apply mastic sealant - a fiber-reinforced, water-based compound that remains flexible and airtight across temperature swings. This is the correct repair. A fogging “sanitizer” sprayed into a leaky duct does not seal anything. The air still bypasses the filter and coil.
Metal Duct Repair
Some older Flower Mound homes and commercial conversions still use galvanized steel trunk lines. We patch corrosion holes, reseal longitudinal seams, and replace damaged takeoff fittings. Metal work costs more than flex replacement because it takes longer, but in certain configurations it’s the right fix. We photograph the damage, quote the repair in writing, and show you the after.
Air Leak Repair
Unconditioned attic air pulled into supply ducts through separated joints or crushed runs is common in Flower Mound’s two-story, multi-zone homes. We pressurize the system, locate leaks with smoke pencil and thermal indication, then repair and seal. The goal is measured: return the system to design static pressure and stop the attic from becoming part of the conditioned airstream.
Duct Insulation
Where flex duct insulation has compressed or torn - common in superheated Flower Mound attics - we replace or supplement with proper R-value insulation. Condensation on cold supply ducts in humid attics leads to water staining, microbial growth, and eventual liner failure. Insulation is prevention, not cosmetics.
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 Flower Mound
Our equipment roster includes Rotobrush rotary systems for mechanical agitation, Nikro negative-pressure extractors for debris removal, and Honeywell and Aprilaire components for filtration and control upgrades. These are trade-recognized brands you can verify independently. We don’t claim performance beyond manufacturer specifications. What we do claim is documented use: every job record notes which equipment was deployed, and the photo record shows what it removed or repaired.
Common Duct Repair & Sealing Problems We See in Flower Mound Homes
- Kinked flex duct at joist crossings. In Flower Mound’s 1995-2010 tract builds, original flex runs were often draped across attic joists without proper support. Decades of thermal cycling compress the spiral wire at the contact point. The kink restricts airflow, increases static pressure, and traps debris where standard brush equipment can’t reach. We replace the crushed section and install proper support straps.
- Failed tape joints from humidity exposure. Grapevine Lake’s ambient moisture keeps attic humidity higher than in drier inland DFW suburbs. Mastic and tape on flex duct joints separate earlier here than in, say, Keller or Southlake. We find separated boots and plenum connections on most 20-plus-year-old systems in Flower Mound. The repair is mastic sealant, not more tape.
- Original plenum leaks in multi-zone homes. Large Flower Mound homes often run two or three HVAC systems with extensive duct networks. Original plenum and boot connections were taped, not mastic-sealed. Decades of expansion and contraction open gaps that bypass the filter entirely. A fogging sanitizer does not close these gaps. Physical sealing does.
- Microbial growth on aged flex duct liner. Elevated attic humidity plus organic debris from Flower Mound’s heavy cedar pollen season creates conditions for mold and biofilm on the inner surface of flex duct. The camera shows it. We document it. Replacement of affected sections, combined with proper sealing to stop humid attic air infiltration, is the repair. Surface spraying without fixing the moisture source is not.
Pricing for Duct Repair & Sealing in Flower Mound, TX
Here’s what we actually charge. Every price is written and agreed before work starts. Haven Standard Clause 1.
| Service | Typical Range in Flower Mound |
|---|---|
| Targeted mastic sealing (single system, up to 10 joints) | $280-$420 |
| Flex duct section replacement (1-2 runs, supported) | $340-$580 |
| Multi-zone full-system seal and repair | $520-$680 |
| Metal duct patch and seam reseal | $380-$620 |
| Duct insulation replacement (per run) | $180-$290 |
What moves the price: linear footage of ductwork, accessibility (tight attics take longer), number of HVAC zones, and whether we’re repairing or replacing. A 4,500-square-foot Lakeside home with three systems and collapsed flex at multiple joist crossings sits at the high end. A single-system mastic seal on accessible boots sits at the low end. We don’t do per-vent pricing. One flat price per system, agreed in writing, before we start.
Free estimates. Bring a competitor’s written quote and we’ll put our number next to it. Free Second Opinion, Haven Standard Clause 5.
We Also Serve Cities Near Flower Mound
Our crews run regularly to Flower Mound, Southlake, Grapevine, Lewisville, and Keller. The same written-price protocol, same documented photo record, same equipment roster applies in every city. Dispatch and scheduling are coordinated from our Dallas-Fort Worth office.
Serving Flower Mound, TX - Our Local Coverage Area
We’re based in the Flower Mound 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 Flower Mound
Yes, it can. Grapevine Lake’s proximity elevates ambient humidity, and that moisture enters attic spaces through soffit vents and ridge gaps. When humid attic air contacts the cooler surface of supply ducts - especially where insulation has compressed or tape has failed - condensation forms. Combine that with organic debris from Flower Mound’s heavy pollen seasons, and microbial growth on flex duct liner becomes likely after 15-20 years. The camera shows it. We document it. The repair is fixing the moisture source through proper sealing and insulation, not spraying a fogging agent into a still-leaky system. Call (682) 297-4068 for a camera inspection.
We got a call from a Lakeside homeowner whose upstairs system hadn’t kept up since spring - static pressure was high, airflow at the registers was weak, and camera inspection showed a crushed flex run pinched flat where it crossed a joist near the air handler. After pulling the failed section under negative pressure, we rebuilt the run with supported, properly sized flex, sealed every boot and plenum joint in the supply and return ducts with mastic, and the static pressure dropped enough that both upstairs zones started cycling normally. Weak upstairs airflow in Flower Mound’s two-story homes is often duct restriction, not compressor failure. A static pressure test and camera inspection tell the difference in about 30 minutes. Call (682) 297-4068 to schedule.
Usually yes, if the ductwork is otherwise intact. Most Flower Mound homes built 1995-2010 have flex duct that’s physically sound but poorly sealed at original joints. Mastic sealing at plenums, boots, and connections can recover 15-25% of conditioned air currently lost to the attic. That measured improvement in delivered airflow often extends the viable life of the existing ductwork by years. We photograph the condition of the liner before recommending seal-only versus replacement. If the flex is torn, compressed, or internally soiled, sealing alone is throwing good money at bad material. Call (682) 297-4068 and we’ll show you what the camera saw.
A genuine cleaning removes debris through mechanical agitation and negative-pressure extraction - Rotobrush contact with the duct surface, Nikro vacuum capture, documented before-and-after photography. A fogging sanitizer deposits chemical on surfaces without removing the material underneath. It does not seal leaks. It does not restore airflow. It does not remove the debris load that feeds microbial growth. In Flower Mound’s humid attics, where separated joints pull unfiltered attic air into the system continuously, fogging is particularly pointless: the contamination source remains active. We don’t sell it. We document what we removed, photograph every run, and deliver the record as a standard job deliverable.
January through February brings some of the highest cedar pollen loads in North Texas, and Flower Mound sits squarely in the corridor. Fine particulate enters the return side of the HVAC system, deposits in duct runs, and combines with humidity to form a tacky layer that standard fiberglass filters don’t stop. Over years, this accumulation restricts airflow and provides organic substrate for microbial growth. The repair is mechanical removal during cleaning, combined with sealing return leaks that bypass the filter. We photograph the debris load. You see what was there. Call (682) 297-4068 for an inspection estimate.
Ready to see what’s actually inside your ductwork? Call (682) 297-4068 for a free, written estimate. Every job includes a Documented Photo Record of every duct run, the 365-Day Done Right Promise in writing, and a flat price agreed before any work starts. No per-vent pricing. No fogging upsells. Just documented repair and sealing, done under the H.A.V.E.N. Standard.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Flower Mound and the Dallas-Fort Worth metro since 2013.