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 San Antonio
Duct repair and sealing in San Antonio typically costs $280-$650 for most residential jobs, with flex-duct repairs running $180-$340 per run and whole-system mastic sealing ranging $400-$850 depending on accessibility. Our crews dispatch from the San Antonio office and carry the equipment to complete most repairs in a single visit.
We’re the Duct Repair & Sealing team at CleanRun, and we’ve been working inside San Antonio ductwork since 2013. The homes we see in Castle Hills, Alamo Heights, and the northwest-side subdivisions near Loop 1604 don’t have generic problems. They have San Antonio problems: original flex-duct systems installed during the 1980s-2000s building boom, cooked by attics that hit 150°F for months at a stretch, then infiltrated by cedar pollen so fine it slips through gaps a standard cleaning won’t touch. That’s why we photograph every duct run before and after, quote a written price before any panel comes off, and back every job with the 365-Day Done Right Promise. Call (830) 402-5110 when you’re ready to see what’s actually inside your system.
Why CleanRun Air Duct Cleaning Schertz Is San Antonio’s Preferred Duct Repair & Sealing Company
San Antonio homeowners have sent us into more than 52,000 homes since 2013, and every single job started with a written price and ended with a documented photo record. Not a policy. A practice. Haven Standard Clause 1: written pricing before work starts, no exceptions.
Our technicians are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews. They operate under the full H.A.V.E.N. Standard, with license number published openly, not buried in a footer. The equipment they carry includes Rotobrush and Nikro systems, names you can look up and verify yourself.
Scheduling and dispatch run through our San Antonio office, so crews serving neighborhoods from Monte Vista to Stone Oak aren’t routing from another metro. That matters when you’re trying to coordinate around work or school. All calls are answered by a live person, 24/7.
We also offer a Free Second Opinion on any written estimate. Bring a competitor’s quote. We’ll put our number next to it in writing.
Our Duct Repair & Sealing Services in San Antonio
Duct Sealing
San Antonio’s 7-plus months of continuous AC operation pull enormous air volume through every joint and seam in your system. When we pressurize a typical north-side home’s ductwork, we regularly find 15-25% air loss through gaps at the plenum (the main distribution box), register boots, and longitudinal seams in metal trunk lines. Our duct sealing service applies mastic sealant - a thick, fiber-reinforced compound that remains flexible after curing - to every accessible joint, then verifies the seal with a pressure test. In San Antonio’s climate, this isn’t an upgrade. It’s often the difference between cooled air reaching your living room and cooling your attic instead.
Flex Duct Repair
The slab-on-grade boom that built much of San Antonio’s north and northwest sides installed millions of feet of flex duct - insulated flexible tubing with a wire helix and polymer liner. In attics that exceed 150°F from May through September, that liner degrades, the wire fatigues, and the duct collapses or pulls off its boot collar. On a slab-on-grade home in Helotes, our techs ran a camera inspection through the supply and return ducts and found the original 1990s flex-duct runs had partially collapsed and pulled off their boot collars after years of thermal cycling in a 150°F-plus attic. We reattached and sealed the separated joints with mastic sealant, wrapped the repaired runs in duct insulation, and verified the air handler was no longer drawing raw attic air and cedar pollen into the supply stream. The homeowner’s complaint - a supply register blowing weak and dusty air in the back bedroom - traced straight back to a crushed run that a cleaning alone would never have fixed. Flex duct repair in San Antonio runs $180-$340 per run, with written pricing before any work begins.
Metal Duct Repair
Older San Antonio homes, particularly in neighborhoods like Terrell Hills and Olmos Park, often have galvanized steel trunk lines with spot-welded seams or transverse joints sealed with aging tape. The thermal expansion from San Antonio’s attic heat cycles eventually cracks these seals or loosens the mechanical fasteners. We repair separated metal joints with mastic and mechanical reinforcement, replace rusted sections with new galvanized stock, and seal all penetrations. Metal duct repair typically ranges $220-$480 in San Antonio, depending on accessibility and the extent of corrosion.
Duct Insulation
When we repair or reattach flex duct in San Antonio, we always evaluate the insulation wrap. Attic heat degrades the R-value of original insulation over 15-20 years, and compromised insulation means cooled air gains 10-15°F before it reaches your register. We install new duct insulation with proper vapor barriers, sealed at all seams, to maintain the thermal integrity of the repaired system. Duct insulation work in San Antonio typically adds $150-$320 to a repair job, quoted as a line item in your written price.
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 San Antonio
Our crews carry professional-grade equipment from trade-recognized brands: Rotobrush and Nikro for mechanical agitation and negative-pressure extraction, Honeywell controls and sensors for pressure-testing and verification. We stock mastic sealant, flex-duct connectors, and insulation wrap in our San Antonio warehouse, so most repairs don’t wait on parts. Guardsman protective materials keep your floors and furnishings clean while we work. You can look up every brand name yourself - we name them precisely so you can.
Common Duct Repair & Sealing Problems We See in San Antonio Homes
- Original flex-duct systems degraded by attic heat. The 1980s-2000s tract homes that dominate San Antonio’s north and northwest sides were built with flex duct rated for standard attic conditions. San Antonio attics are not standard. At 150°F-plus for months at a stretch, the polymer liner flakes, the wire helix fatigues, and joints separate. A “duct cleaning” in these homes often reveals that the duct itself is the problem.
- Cedar pollen infiltration through ill-sealed returns. San Antonio sits at the base of the Hill Country’s Ashe juniper belt, so December-February cedar pollen infiltrates return-air systems through any gap or ill-sealed register - meaning a duct “clean” in San Antonio often uncovers leaks that are actively pulling one of the nation’s most potent regional allergens directly into the supply stream. Add 7-plus months of continuous AC operation pulling caliche limestone dust from the surrounding semi-arid terrain, and San Antonio ducts carry an allergen-and-particulate load that flat-terrain cities like Houston never see.
- Collapsed flex ducts near the Balcones Escarpment. Northwest-side subdivisions near the Balcones Escarpment - Helotes, Leon Valley - routinely show flex ducts partially collapsed or pulled off boot collars, drawing raw attic air straight into the supply stream. The thermal cycling is severe, and the pollen load is immediate.
- Mastic sealant failure on original metal systems. Homes built before the flex-duct era, common in Alamo Heights and Monte Vista, often have metal trunk lines sealed with mastic that has dried and cracked after 30-40 years of heat cycling. The leaks are invisible from the living space but measurable in the attic.
Pricing for Duct Repair & Sealing in San Antonio, TX
We quote every job with a written price before any work starts. No exceptions. Haven Standard Clause 1.
| Service | Typical Range in San Antonio |
|---|---|
| Flex duct repair (per run) | $180 - $340 |
| Metal duct repair (section) | $220 - $480 |
| Mastic sealing (whole system) | $400 - $850 |
| Duct insulation (per run) | $150 - $320 |
| Air leak repair (register/boot) | $85 - $175 |
What moves a quote within these ranges: attic accessibility (scuttle vs. pull-down stairs), the number of separated joints, whether collapsed duct needs full replacement or reattachment, and whether we need to remove stored items to access the plenum. We photograph everything we find, show you the images, and deliver the written price before any repair begins. No per-vent pricing. No coupon that triples once the truck arrives. One flat price per system, agreed in writing.
Call (830) 402-5110 for a free estimate. We’ll put a number in writing you can compare.
We Also Serve Cities Near San Antonio
Our Duct Repair & Sealing in San Antonio crews also work in Converse, Universal City, Schertz, and Cibolo. Same written pricing, same documented photo record, same 365-Day Done Right Promise. Scheduling runs through the San Antonio office for all locations.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 San Antonio
Because the camera doesn’t lie. In San Antonio’s 1980s-2000s housing stock, we regularly find flex ducts that have collapsed, separated at boot collars, or degraded to the point that cleaning the interior would be like washing a hose with a hole in it. The cleaning appointment becomes a repair recommendation because the duct itself has failed structurally. Call (830) 402-5110 and we’ll show you exactly what the camera found - before any work starts.
Yes. San Antonio’s position at the base of the Hill Country’s Ashe juniper belt means December-February brings some of the highest cedar pollen concentrations in the nation, and the particles are small enough to infiltrate through gaps as narrow as 1/16 inch. If your return-air system has separated joints or ill-sealed registers, you’re not just recirculating household dust - you’re actively pulling raw cedar pollen into your supply stream. Sealing those leaks is the structural fix. Call (830) 402-5110 for an inspection.
We start with a camera inspection of every accessible duct run, photograph the condition, and pressure-test the system to quantify air loss. Then we deliver a written scope and price. If you approve, we repair or replace damaged duct, apply mastic sealant to all joints, verify with a post-repair pressure test, and deliver before-and-after photos of every run as part of your documented job record. The 365-Day Done Right Promise applies to all work. Call (830) 402-5110 to schedule.
The combination of severe attic heat cycling and proximity to the Balcones Escarpment’s cedar pollen load creates a double stressor. Flex ducts in these areas experience more thermal expansion and contraction, accelerating joint failure, and when those joints separate, the immediate pollen infiltration is both rapid and intense. We’ve replaced more collapsed flex runs in Helotes and Leon Valley than in flatter, cooler parts of the metro. Call (830) 402-5110 if you’re in these areas - we’ll check your boot collars specifically.
Signs that sealing is the real need: uneven temperatures room-to-room, weak airflow at distant registers, dust accumulation immediately after professional cleaning, or worsening allergy symptoms during cedar season. We verify with a pressure test - if your system is losing more than 10% of its air to the attic, sealing is the structural fix and cleaning alone won’t solve it. Call (830) 402-5110 for a free estimate with pressure testing included.
Ready to see what’s actually happening inside your ductwork? Call CleanRun at (830) 402-5110. We’ll answer with a live person, schedule at your convenience, and deliver a written price before any panel comes off. Every repair is photographed, every job is backed by the 365-Day Done Right Promise, and every technician operates under the full H.A.V.E.N. Standard. Haven Standard Clause 1: written pricing before work starts. Always.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving San Antonio since 2013.