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 runs $280-$890 for most residential jobs, with full-system sealing on older homes climbing toward the upper end when original galvanized metal or degraded flex duct is involved. Our crews dispatch from the San Antonio office and carry mastic sealant, collar connectors, and flex-duct replacement stock sized for the tract homes and custom builds we see across Bexar County.
San Antonio’s housing stock tells its own story. The slab-on-grade neighborhoods built between Loop 410 and 1604 during the 1970s and 1980s, the northward push into Stone Oak and Alamo Ranch in the 1990s and 2000s, and the older pockets near Fort Sam Houston all share one trait: ductwork routed through unconditioned attics, baking nine months a year, pulling pollen-laden air, and degrading in ways that cleaning alone won’t fix. That’s where our Duct Repair & Sealing team starts - with a camera inspection that shows you what’s actually broken before we quote a written price.
Call (830) 549-6847. Estimates are free, and every quote is delivered in writing before work begins.
Why CleanRun Air Duct Cleaning New Braunfels Is San Antonio’s Preferred Duct Repair & Sealing Company
We’ve served San Antonio homeowners since 2013 under the Haven Standard, and our approach hasn’t changed: documented photo record on every visit, written price before any work starts, and technicians who explain what they found before suggesting what to do about it. No coupons, no bait-and-switch, no per-vent arithmetic that turns a $79 special into a $900 invoice.
Our San Antonio customers receive the same deliverables as every CleanRun job - a complete photo record of every duct run, before and after, plus the written scope and the 365-Day Done Right Promise backed in writing. Haven Standard Clause 1 requires that price; Haven Standard Clause 3 requires background-checked, uniformed crews identified by name before arrival. Tomas Reyes built this standard into the company from the first job, and it applies to every home we enter in San Antonio.
Dispatch and scheduling are coordinated from our San Antonio office, so crews carry parts and equipment matched to local conditions: Rotobrush and Nikro negative-pressure extraction systems for source removal, Honeywell and Aprilaire components for sealing and filtration upgrades. We’re not driving up from out of town with a shop vac and a roll of tape.
Our Duct Repair & Sealing Services in San Antonio
Duct Sealing
Most San Antonio homes we inspect leak 20-30% of conditioned air into the attic before it reaches the registers. In a climate where AC runs nine months a year, that’s not an efficiency problem - it’s a structural one. We seal with mastic sealant at every joint, boot, and collar connection, not foil tape that degrades in 140°F attic heat. Typical duct sealing in San Antonio runs $280-$550 for a single-system home. We quote the full scope in writing before opening a single panel.
Flex Duct Repair
Flex duct in Stone Oak, Alamo Ranch, and Helotes is now 20-30 years old, and the inner liners have turned brittle from heat cycling. We regularly find complete detachments at boot connections, with 150°F attic air and fiberglass particles pulling straight into supply runs. Our crews replace crushed or disconnected flex duct with new insulated runs, secure collars with mechanical fasteners (not zip ties), and photograph every connection before closing the attic. Flex duct repair in San Antonio typically ranges $180-$420 per run, depending on attic access and length.
Metal Duct Repair
The original galvanized sheet-metal ducts in 1970s-1980s homes on San Antonio’s South Side and near Fort Sam Houston weren’t designed for forty years of caliche dust accumulation and humidity-driven corrosion. We repair separated seams, replace rusted sections, and seal with mastic where the original duct tape has turned to powder. When a return run is crushed behind the air handler - a failure mode we see repeatedly - we reroute or replace to restore proper airflow. Metal duct repair in San Antonio runs $340-$780, with full section replacement at the higher end.
Duct Insulation
Condensation on cold duct surfaces during Gulf moisture surges - when attic humidity spikes to 80-90% - creates mold colonization inside flex-duct liner seams. Insulation alone won’t fix a moisture source, but properly insulated and sealed ducts resist the temperature differential that triggers condensation. We install foil-faced insulation with sealed vapor barriers, photographed before and after, as part of a complete system repair. Duct insulation work in San Antonio typically adds $220-$480 to a sealing job.
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 equipment roster includes Rotobrush and Nikro negative-pressure extraction systems for source removal, Honeywell media filters and electronic air cleaners, and Aprilaire humidification and dehumidification components. We stock collar connectors, flex-duct termination fittings, and mastic sealant matched to these systems so San Antonio customers aren’t waiting on parts while attic heat continues degrading their ductwork. Every brand is named on your written scope so you can verify specifications independently.
Common Duct Repair & Sealing Problems We See in San Antonio Homes
- Crushed return runs behind the air handler - In 1970s-1980s slab-on-grade homes off Loop 410 and near Fort Sam Houston, the original return duct was often routed with insufficient clearance. Decades of vibration and caliche dust accumulation compress the duct flat, pulling raw attic air through gaps while starving the system of return airflow.
- Detached flex-duct boots in northwest-side attics - Stone Oak, Alamo Ranch, and Helotes homes built during the 1990s-2000s expansion now have flex duct that has separated completely from supply boots. The homeowner feels weak airflow at registers; the real problem is 150°F attic air dumping into the system through the open connection.
- Mastic failure at galvanized joints - Original mastic sealant on 1970s-1980s metal duct has dried and cracked after forty-plus years of heat cycling. We find supply leaks that have been active for a decade or more, often concealed above drywall and discovered only during camera inspection.
- Mold colonization in flex-duct liner seams - Gulf moisture surges create condensation on cold duct surfaces in hot attics. The resulting mold growth inside flex-duct seams can’t be cleaned; the affected section must be removed, the moisture source addressed, and new sealed duct installed.
Pricing for Duct Repair & Sealing in San Antonio, TX
We publish ranges because Haven Standard Clause 1 requires a written price before work starts - and that price should be grounded in what San Antonio jobs actually cost, not a teaser that changes once the truck is in your driveway.
| Service | Typical Range in San Antonio |
|---|---|
| Duct sealing (single system, mastic) | $280 - $550 |
| Flex duct repair / replacement (per run) | $180 - $420 |
| Metal duct repair (seam/separation) | $340 - $780 |
| Duct insulation (add-on to sealing) | $220 - $480 |
| Full system: sealing + multiple repairs | $650 - $1,400 |
Factors that move a San Antonio job toward the higher end: attic access restrictions (some 1970s-1980s homes have hatches too small for a technician with equipment), multiple crushed or disconnected runs requiring replacement rather than sealing, and corrosion damage to original galvanized metal that necessitates section replacement. Every variable is noted on your written scope before work begins. Call (830) 549-6847 for a free estimate - we’ll inspect with a camera, show you what we found, and deliver a written price you can compare against any competitor’s quote.
We Also Serve Cities Near San Antonio
Our San Antonio crews also handle duct repair and sealing in Converse, Universal City, Schertz, and Cibolo - the same equipment, the same Haven Standard, the same written price guarantee. Dispatch is coordinated from the San Antonio office, so response times to these communities remain short without the overhead of a separate operation.
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 inspection that precedes every CleanRun cleaning reveals structural failures that cleaning alone cannot address. In San Antonio specifically, decades of attic heat cycling have detached flex-duct boots and cracked mastic at metal joints, while caliche dust and pollen accumulation mask the underlying damage. We photograph every finding and present repair options with a written price before proceeding. Call (830) 549-6847 to schedule an inspection.
Caliche is the fine limestone powder native to the Edwards Plateau substrate beneath San Antonio; construction activity across decades of development has kicked this material into attics and wall cavities. In original galvanized ducts from the 1970s and 1980s, caliche dust layers over organic debris and restricts airflow in ways that standard cleaning cannot fully reverse - the real fix is often section replacement plus sealing to prevent re-accumulation. We show you the buildup on camera before recommending any work.
Sealing reduces the infiltration of unfiltered attic air and pollen-laden return leaks, but it cannot eliminate Cedar Fever on its own. San Antonio’s position in the Ashe juniper belt means record pollen loads every December through February; the most effective approach is sealing leaky ducts to prevent recirculation, upgrading to MERV 13 filtration, and scheduling pre-season system inspection. We document seal quality with before-and-after pressure testing when requested.
Weak airflow at specific registers, rooms that won’t cool despite open vents, or a sudden spike in summer electric bills often indicate a detached boot. In San Antonio’s northwest-side subdivisions - Stone Oak, Alamo Ranch, Helotes - we find complete detachments in roughly one of every three homes built 1995-2005. A camera inspection confirms the failure without attic entry; we show you the image and quote repair in writing. Call (830) 549-6847 to check.
Yes. Our source removal, negative-pressure extraction with HEPA filtration, and post-repair verification follow NADCA guidelines for HVAC system cleaning and restoration. The Haven Standard adds requirements NADCA does not: written price before work starts, documented photo record of every run, and the 365-Day Done Right Promise backed in writing. Tomas Reyes established these protocols in 2013, and they apply to every San Antonio job we perform.
Ready to see what’s actually happening inside your ducts? Call (830) 549-6847 for a free estimate. We’ll deliver a written price before any work starts, photograph every duct run before and after, and back the result with our 365-Day Done Right Promise.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving San Antonio since 2013.