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 Windcrest
We dispatch to Windcrest from our San Antonio coordination office, and most calls from the 78239 ZIP code are scheduled within 48 hours. If you’re noticing uneven airflow, musty odors after storms, or utility bills climbing without explanation, your ductwork is likely the culprit. Call us at (830) 402-5110 for a free written estimate - we’ll inspect every run with a camera and show you exactly what we find before any work begins.
Windcrest’s unique situation as a fully enclosed enclave city means we’ve worked on hundreds of homes within its single square mile. The housing stock here is remarkably consistent: postwar ranch homes built between 1952 and 1975, most with original or first-generation duct systems now pushing 50 to 70 years of service. That uniformity gives our crews an unusual depth of local knowledge. We know which blocks still carry unlined sheet-metal trunks, where early flex-duct installations were routed through attics that hit 140°F in July, and how the caliche limestone dust pervasive in Bexar County soil works its way into compromised joints over decades.
Why CleanRun Air Duct Cleaning Schertz Is Windcrest’s Preferred Duct Repair & Sealing Company
We’ve served over 52,000 homes since 2013, and Windcrest represents one of our most concentrated service areas due to that uniform housing stock. Homeowners here find us the same way most do: they research every option, compare what companies can actually document, and choose based on evidence rather than promises. Our Duct Repair & Sealing team arrives with written pricing already prepared, background-checked and uniformed technicians identified by name before they knock, and equipment from trade-recognized brands customers can verify independently.
Our reputation in Windcrest is built on a specific deliverable: the Documented Photo Record. Every duct run is photographed before and after, with moisture readings and damage notation included when relevant. Customers receive this as a standard job record, not an upsell. The 365-Day Done Right Promise applies to every repair we make - if it’s not right, we make it right, backed in writing on every invoice under Haven Standard Clause 1.
Response time to Windcrest is typically same-week scheduling, with emergency assessments after storms prioritized based on documented moisture intrusion rather than who calls loudest. We don’t manufacture urgency. We document it.
Local knowledge matters here in ways it doesn’t in mixed-era San Antonio. When our crew pulls onto a Windcrest block, they’re prepared for the specific failure modes of that era’s construction: corroded branch joints at the plenum (the main distribution box), degraded flex-duct inner liners shedding fibers into supply air, and mastic seals applied decades ago that have turned brittle and porous. We don’t waste time diagnosing what we already recognize.
Our Duct Repair & Sealing Services in Windcrest
Duct Sealing
Most Windcrest homes lose 20-30% of conditioned air through leaks before it reaches the registers (the visible vents in each room). In a 1,400-square-foot ranch with original trunk-and-branch ductwork, that’s heated and cooled air paying to condition your attic. Our sealing process starts with a pressure test to locate leaks, then applies mastic sealant - a thick, fiber-reinforced compound that remains flexible - to every compromised joint and seam. We don’t use tape as a primary seal; tape fails in Windcrest’s 140°F+ attic heat. The mastic we apply is rated for the temperature swings these homes experience, and we photograph every sealed joint for the job record.
Flex Duct Repair
Early flex-duct installations in Windcrest, common from the late 1960s through the 1970s, used inner liners that degrade predictably after decades of heat cycling. After a late-summer storm pushed water through a soffit vent on a 1960s ranch off Essary Drive, our tech ran camera inspection through the attic-run trunk line and found saturated flex-duct inner liner and corroded branch joints - most of the metal trunk was salvageable, but about 40 feet of flex had to be cut out and rebuilt with new R-8 insulation and mastic-sealed collars. We documented every compromised segment with NADCA-style photos and moisture readings so the homeowner’s insurer approved the replacement instead of calling it a cleaning job. That’s standard procedure, not a special request.
Metal Duct Repair
Sheet-metal trunk lines in Windcrest’s 1950s and 1960s homes were often installed without interior lining, or with early fiberglass liners that have since degraded. The real problem we find: rust-through at bottom runs where condensation has collected for decades, or where caliche dust has abraded the metal from the inside. Cleaning and re-sealing these lines when they’ve actually rusted through is a misdiagnosis - the real defect is replacement. Our camera inspection shows you the difference before any scope of work is proposed. Haven Standard Clause 1 requires written pricing before work starts, so you’ll see the repair-versus-replace decision documented with photos, not explained with hand waves.
Duct Insulation
R-4 or uninsulated ductwork in Windcrest attics is effectively trying to push 55°F air through a 150°F environment in August. We replace degraded insulation wrap with R-8 rated material, properly sealed at all seams, and we verify with infrared imaging where accessible. For homes with attic-run flex duct, we often find the original insulation has compressed or separated from the inner core, creating thermal bridges that show up as hot spots on the duct surface. The improvement in supply-air temperature after proper re-insulation is measurable at the register - typically 8-12°F colder in summer conditions - and we document that with before-and-after readings.
Mastic Sealant Application
Mastic is the only sealant we trust for Windcrest’s conditions. Brush-applied in a thick coat over mesh reinforcement at joints, it cures to a flexible, durable seal that outlasts any tape product in high-heat attic environments. We apply it to plenum connections, branch takeoffs, and any accessible seams in the trunk line. Critical caveat: mastic-sealing a branch joint that looks dry but is still wicking moisture from a previous storm guarantees failure. The seal traps moisture, creating a mold growth point inside the duct within months. Our moisture-meter protocol, standard on every post-storm assessment, prevents this misstep.
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 Windcrest
Our equipment roster includes Rotobrush for mechanical agitation in duct runs, Nikro for negative-pressure extraction systems, and Honeywell and Aprilaire components for filtration and control upgrades where duct repairs expose opportunities for improvement. We don’t invent performance claims beyond manufacturer specifications - customers can look up these brands independently and verify what each system is engineered to do. For Windcrest’s vintage housing stock, we stock common collar sizes, flex-duct diameters, and mastic compounds matched to the era’s installations, which means most repairs don’t wait on parts orders. Turnaround from assessment to completion is typically single-visit for sealing work and two visits for replacement jobs requiring material staging.
Common Duct Repair & Sealing Problems We See in Windcrest Homes
- Storm-saturated flex duct with hidden moisture wicking. After Windcrest’s humid late-summer storms, flex-duct inner liners can hold moisture for weeks while appearing dry at the exterior. Sealing these joints without moisture verification traps water inside, creating mold conditions. We meter every segment before sealing.
- Rusted-through bottom runs in sheet-metal trunks. Decades of condensation pooling in low sections has eaten through the metal from the inside. Cleaning and re-sealing these lines wastes money - the real fix is replacement of the compromised section, documented for insurance where storm contribution is established.
- Degraded flex-duct inner liners shedding fibers into supply air. Attic temperatures exceeding 140°F have baked the liner material brittle. Sealing the seams doesn’t stop fiber shedding - the liner itself is failing and needs replacement with new R-8 flex duct.
- Failed original mastic at plenum connections. First-generation seals applied in the 1960s and 1970s have turned porous and detached. These leaks are invisible from the living space but measurable as significant pressure loss. Re-sealing with modern mastic restores system efficiency and is photographically verifiable.
Pricing for Duct Repair & Sealing in Windcrest, TX
A typical duct sealing job for a Windcrest ranch home runs $1,200-$2,400, depending on system accessibility and the number of branch joints requiring mastic application. Flex duct repair, when sections can be salvaged and reconnected, ranges $400-$900 per run replaced. Full flex-duct replacement through an attic - common after storm saturation - typically falls between $2,800 and $5,500 for a complete system. Metal duct repair, limited to sectional replacement of rusted trunk lines, averages $800-$1,600 per compromised section including insulation and sealing.
What moves the number: attic accessibility (some Windcrest homes have limited hatch sizes or truss configurations that complicate work), the extent of moisture damage requiring documentation for insurance, and whether register boots (the connections at each room vent) also need resealing or replacement. Every price is written and agreed before work starts - Haven Standard Clause 1, no exceptions. Free estimates include the full camera inspection and photo documentation. Call (830) 402-5110 to schedule.
We Also Serve Cities Near Windcrest
Our crews work throughout the San Antonio metro area, with concentrated routes in Windcrest, Schertz, Cibolo, Universal City, and Selma. Scheduling is coordinated to minimize drive time between jobs, which keeps our pricing consistent across these communities without the markup some companies charge for “travel.”
Serving Windcrest, TX - Our Local Coverage Area
We’re based in the Windcrest 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 Windcrest
Replacement is required when the inner liner is saturated or metal has rusted through; cleaning suffices only for surface debris in structurally intact ductwork. We determine this with camera inspection and moisture metering, not visual guesswork. If replacement is indicated, we document every compromised segment with photos and readings so your insurer understands why cleaning won’t suffice. Call (830) 402-5110 for a post-storm assessment - estimates are free.
Yes, our documentation follows NADCA photo standards and includes moisture readings, damage notation, and a written scope of work - the format most insurers expect for HVAC component claims. We’ve had claims approved by major carriers operating in Bexar County. The key is distinguishing cleanable surface contamination from structural damage, and our camera inspection makes that distinction visible. Bring your adjuster’s contact information and we’ll coordinate directly if helpful.
Windcrest’s housing stock was built in a single 1952-1975 wave, meaning nearly every home on a given block has the same vintage ductwork reaching end-of-life simultaneously. Original mastic seals have turned brittle, early flex-duct liners have degraded from decades of 140°F attic heat, and caliche dust abrasion has thinned metal at stress points. Newer neighborhoods have mixed-era construction with varying duct materials and ages - failures are scattered. In Windcrest, they’re clustered by block, which is why post-storm call volume here often hits entire streets at once.
Within one to two weeks, before moisture trapped in attic-run ductwork fosters mold growth or corrodes metal joints further. We prioritize post-storm assessments based on documented moisture intrusion, not call order. The inspection itself is free and includes moisture readings at every accessible segment. Even if you’re unsure whether damage occurred, the camera inspection provides certainty - and documentation if problems develop later.
It makes system integrity more consequential. Bexar County’s mountain cedar pollen, peaking December through February and ranked among North America’s most potent allergens, gets systematically distributed through leaky ductwork into every room. Sealed ducts with intact filtration contain this load; compromised ducts amplify it. For Windcrest homes with original 1950s-1970s systems that were never engineered for modern filtration, sealing is one of the most effective measures to reduce indoor pollen exposure. The work is photographically verifiable, and the improvement in register leakage is measurable.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Windcrest and the greater San Antonio area since 2013.