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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Before
AfterFast, Reliable Duct Repair & Sealing Across Selma
Duct repair and sealing in Selma typically runs $280-$650 for most homes, with flex duct replacement averaging $180-$340 per run and whole-system mastic sealing starting around $450. We’re usually able to schedule within 2-3 business days because our crews dispatch from the San Antonio office and know Selma’s street grid well. If your registers are blowing dust, your upstairs rooms won’t cool evenly, or your energy bills have climbed without explanation, the problem is often in the attic flex ductwork - and it’s fixable in a single visit. Call (830) 402-5110 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Schertz Is Selma’s Preferred Duct Repair & Sealing Company
We’ve been documenting the inside of every duct run we touch since 2013. That practice hasn’t changed for Selma homes. What has changed is how predictable the problems have become here.
Because Selma incorporated and built out almost entirely after 2000, entire subdivisions went up in 2-4 year waves using identical builder-grade materials. Our Duct Repair & Sealing team now recognizes the flex duct layouts from national volume builders before we pull down the attic ladder. The sag points, the unsupported mid-span droops, the boot connections that were never sealed with mastic - we’ve photographed them hundreds of times in Selma neighborhoods from The Ridge to Retama Ranch.
Selma customers receive the same deliverables as every CleanRun job: a written price before work begins, a Documented Photo Record of every duct run before and after, and the 365-Day Done Right Promise backed in writing. Haven Standard Clause 1 is non-negotiable - no estimate leaves our hands without a dollar figure attached.
Our technicians are background-checked, uniformed, and identified by name before arrival. Haven Standard Clause 3: Verified Crews. You’ll know who’s coming and what they’ll cost.
Our Duct Repair & Sealing Services in Selma
Duct Sealing with Mastic Sealant
Most Selma homes lose 20-30% of conditioned air through leaks at joints, boots, and plenum connections. We seal these with mastic sealant, a water-based compound that remains flexible after curing - critical in Selma attics where summer temperatures exceed 140°F and brittle tapes fail within seasons. A typical whole-system mastic sealing in Selma runs $450-$780 depending on the number of registers and the accessibility of the attic air handler. We photograph every sealed joint before closing the access panel.
Flex Duct Repair
Selma’s housing stock is now hitting the 15-20 year mark, and the flex duct installed by volume builders is showing predictable failure patterns. The inner liner cracks under sustained thermal stress from our 6+ month cooling season. Support hangers spaced too far apart let the duct sag, creating low points where debris dams form. We replace damaged flex runs with new insulated duct, supported at proper intervals, and photograph the full length before insulation goes back. Single flex run replacement in Selma typically costs $180-$340; multiple runs in the same attic reduce per-run labor.
Metal Duct Repair
Some Selma homes, particularly earlier builds near the original town center, use galvanized steel trunk lines with flex branch takeoffs. We repair separated seams, corroded sections, and failed dampers. Metal work runs higher - $320-$580 per repair depending on accessibility - but preserves the original trunk infrastructure when it’s sound. We don’t replace what doesn’t need replacing. The camera shows the difference, and we show you the camera.
Duct Insulation & Air Leak Repair
Attic air leaks in Selma pull in mountain cedar pollen, fiberglass insulation particles, and 140°F attic air every time the system cycles. We identify leaks with pressure testing and visual inspection, then repair and re-insulate. Air leak repair paired with spot insulation typically runs $280-$520 in Selma homes. The work is photographed, and the written scope specifies every location addressed.
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 Selma
CleanRun technicians carry professional-grade equipment from Nikro, Honeywell, and Aprilaire - brands you can look up independently before agreeing to any price. We stock common flex duct diameters, mastic compounds, and boot fittings for Selma’s predominant builder-grade systems, which means most repairs don’t wait on parts. Our negative-pressure extraction units are manufactured by Abatement Technologies. The equipment roster is part of the written scope for every job. You can verify what will be used before you sign.
Common Duct Repair & Sealing Problems We See in Selma Homes
- Construction debris dams in flex duct low points. Selma’s post-2000 tract homes were often closed with drywall dust and wood particulate still inside the duct runs. Our crew was called to a 2012 build in the Mesa Verde subdivision off Cibolo Creek where the homeowner reported visible dust puffing from every supply register at handover. Camera inspection revealed drywall dust and construction debris had settled at a low point in the flex run near the air handler, and the boot connections at two bedrooms had never been properly sealed. We pulled the debris with negative-pressure source removal, re-sealed the boots with mastic, and the register dust stopped immediately.
- Sagging mid-span between joists. Builder-grade flex duct in Selma was frequently installed with support hangers spaced beyond manufacturer spec. The duct droops, the inner liner kinks, and airflow drops by 15-40% at the affected register. We see this on entire streets simultaneously - same builder, same crew, same shortcut.
- Loose boot connections pulling in attic air. Unsealed or poorly sealed boots at registers and returns create negative pressure that draws mountain cedar pollen, insulation fibers, and attic dust directly into your living space. Selma’s position in the cedar pollen corridor makes this a year-round issue, not just a winter one.
- Thermal stress cracking in flex duct liners. Selma’s 6+ month air conditioning season keeps attic ductwork under constant expansion and contraction. The inner liner degrades, microbial buildup follows, and the particulate load from construction debris left at handover becomes a sustained food source. The camera doesn’t lie - we show you the cracking before we quote replacement.
Pricing for Duct Repair & Sealing in Selma, TX
Here’s what duct repair and sealing actually costs in Selma’s market:
| Service | Typical Range in Selma |
|---|---|
| Single flex duct run repair/replacement | $180 - $340 |
| Whole-system mastic sealing | $450 - $780 |
| Metal duct seam repair (per location) | $320 - $580 |
| Air leak repair with spot insulation | $280 - $520 |
| Multi-run flex duct replacement (3+ runs) | $520 - $1,100 |
These are whole-system prices, not per-vent teaser rates. Every estimate is written and delivered before work starts - Haven Standard Clause 1. Factors that move Selma jobs within these ranges: attic accessibility, the number of registers, whether the air handler is in a closet or the attic, and the extent of debris removal required. We don’t quote over the phone without seeing the system, but we don’t charge for the estimate either. Bring a competitor’s written quote and we’ll put our number next to it - Free Second Opinion, no cost.
We Also Serve Cities Near Selma
CleanRun crews work throughout northeastern Bexar and Guadalupe counties. If you’re in Selma or nearby Schertz, Cibolo, Universal City, or Converse, the same scheduling, pricing, and documentation standards apply. Dispatch is coordinated from our San Antonio office, and we route crews to minimize drive time to your neighborhood.
Serving Selma, TX - Our Local Coverage Area
We’re based in the Selma 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 Selma
Because construction debris is almost never fully removed before the certificate of occupancy is issued. In Selma’s fast-built subdivisions, drywall dust, wood particulate, and even fast-food wrappers frequently remain inside flex duct runs. The builder’s HVAC subcontractor often runs the system during construction without filtration, loading the ducts with material that then circulates through your home at handover. We recommend a camera inspection within the first 12 months of ownership - it’s often the only way to document what was left behind. Call (830) 402-5110 to schedule; estimates are free.
Because entire subdivisions were built in 2-4 year windows by the same national volume builders using identical flex duct layouts and the same installation crews. When one home on the street hits 15 years and the support hangers fail, the neighbor’s identical system is failing too. Our technicians can often predict the exact sag points, low-point debris dams, and loose boot connections from the neighborhood’s model year before entering the attic. Call (830) 402-5110 for a written assessment of your specific system.
Yes - pollen that enters through loose boot connections, unsealed plenums, and degraded flex duct liner accumulates in the ductwork and becomes a sustained particulate source. Selma sits squarely within the mountain cedar (Ashe juniper) pollen corridor, and the December-February cedar fever season loads HVAC returns heavily. Once inside, that pollen doesn’t degrade or exit on its own. It feeds microbial growth in the presence of condensation from Selma’s long cooling season. The camera shows the accumulation, and we document it. Call (830) 402-5110 for an inspection.
We use a combination of pressure testing, borescope camera inspection, and visual assessment. The camera enters every duct run, showing cracks, debris accumulation, and disconnected joints in real time. Pressure testing quantifies total system leakage against the conditioned air volume. We don’t guess - we photograph, measure, and show you the evidence before quoting any repair. The photo record becomes part of your job file. Call (830) 402-5110 to see what your ducts actually look like inside.
It depends on what the camera shows, not the age alone. We’ve sealed and extended the life of 18-year-old systems where the flex was structurally sound but poorly supported. We’ve also recommended full replacement where thermal stress has cracked the inner liner extensively and debris dams have compromised airflow beyond recovery. The inspection costs nothing, and the written quote specifies exactly which runs need replacement versus which can be sealed and supported. No blanket recommendations. Call (830) 402-5110 for an exact assessment of your system.
Ready to see what’s actually inside your ducts? Call (830) 402-5110 to schedule a free estimate. You’ll receive a written price before any work begins, a Documented Photo Record of every duct run we touch, and the 365-Day Done Right Promise backed in writing. Haven Standard Clause 1. No exceptions.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Selma and northeastern Bexar County since 2013.