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 Alamo Heights
Duct repair and sealing in Alamo Heights typically runs $280-$650 for most homes, with flex duct replacement at the higher end and mastic sealant touch-ups at the lower. We dispatch crews to Alamo Heights from our San Antonio coordination office, and most repair visits are scheduled within two to three business days. Call (830) 549-6847 for a written estimate before any work starts.
We’ve worked the tree-lined streets near the Country Club, the Sunset Hills area, and the older blocks off Broadway long enough to know what hides in Alamo Heights attics. The Spanish Colonial Revival and Tudor homes that give this neighborhood its character were built between the 1920s and 1950s, before central air existed. When HVAC arrived decades later, installers threaded flex duct through spaces never designed for it. That retrofit history shapes every repair we make.
Why CleanRun Air Duct Cleaning New Braunfels Is Alamo Heights’s Preferred Duct Repair & Sealing Company
Our Duct Repair & Sealing team has photographed the inside of ductwork in Alamo Heights homes since 2013. Every job delivers a Documented Photo Record, a written price agreed before work begins, and the 365-Day Done Right Promise backed in writing. Tomas Reyes built this standard after watching too many homeowners pay for “cleaning” that left no evidence anything happened.
Alamo Heights customers find us because they have already received a vague quote or a coupon offer that ballooned once the truck arrived. We don’t operate that way. Haven Standard Clause 1 requires a written price before any panel comes off, and we publish our license number so you can verify it. Our technicians are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews.
The drive from our San Antonio office to Alamo Heights is routine for us. We know which homes near Alamo Circle have the original galvanized metal sections from 1970s retrofits, and which blocks off Austin Highway are prone to flex separation around structural beams. That local knowledge means we show up with the right materials instead of making a second trip.
Our Duct Repair & Sealing Services in Alamo Heights
Flex Duct Repair
Flex duct is the weak point in most Alamo Heights systems. The inner liner, wrapped in insulation and a plastic jacket, was routed around original beams during mid-century retrofits with tight bends that stress the material. In the 1940s Tudor Revival off Sunset Hills we mentioned, the inner liner had separated at a joint and was feeding blown-in insulation fibers and Mountain Cedar pollen straight into supply and return ducts for several seasons. We rebuilt that connection with mastic sealant and new flex, re-secured it away from the beam, and verified airflow with a blower motor reading and negative-pressure setup. Typical flex duct repair in Alamo Heights runs $320-$580 depending on accessibility and length of replacement.
Mastic Sealant Application
Foil tape degrades. In Alamo Heights attics that hit 140°F through summer, the adhesive backing on older tape turns to powder. Mastic is a fiber-reinforced sealant we brush onto joints and seams, then allow to cure to a flexible, permanent bond. We apply it to metal duct connections, plenum joints, and wherever flex meets a register boot. A typical mastic sealant job for a partial system in Alamo Heights runs $280-$420. Full-system sealing reaches $550-$850 for larger homes near the Country Club with extensive retrofit ductwork.
Metal Duct Repair
Some Alamo Heights homes still have galvanized metal sections from original 1960s or 1970s retrofits. The seams corrode, fasteners loosen, and vibration from the blower motor opens gaps that leak conditioned air into the attic. We patch small breaches with metal-reinforced mastic, replace corroded sections with new galvanized or switch to insulated flex where appropriate, and re-seal every joint. Metal repair in Alamo Heights typically falls between $380 and $720 depending on material extent.
Air Leak Repair
Disconnected joints, separated flex liner, and failed register boots pull unconditioned attic air into your living space. In Alamo Heights, that attic air carries blown-in insulation fibers, caliche limestone dust, and - from December through February - microscopic Mountain Cedar pollen that standard filters miss. We pressure-test the system, locate leaks with smoke pencils and thermal imaging, then repair and re-verify. Air leak repair in Alamo Heights generally runs $260-$540.
Duct Insulation Replacement
Degraded duct insulation sheds fibers that the blower recirculates. We see this in Alamo Heights homes where the original fiberglass wrap has compressed or torn after decades of attic heat. We replace it with new insulation rated for the temperature extremes these attics experience, secured and sealed at every joint. Insulation replacement runs $340-$620 for typical Alamo Heights systems.
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 Alamo Heights
Our equipment roster includes Rotobrush rotary brush systems for mechanical agitation inside duct runs, Nikro negative-pressure extractors for controlled debris removal, and Honeywell media filters and Aprilaire whole-home air cleaners for post-repair air quality upgrades. We stock common flex diameters, mastic compounds, and register boots specific to the sizes found in Alamo Heights retrofits, so most repairs complete in a single visit without waiting on parts.
Common Duct Repair & Sealing Problems We See in Alamo Heights Homes
- Flex liner joints separated around original structural beams. Installers in the 1960s and 1970s routed flex duct around beams never meant to carry it. The tight radius stresses the inner liner until it splits at the joint, pulling unconditioned attic air - insulation fibers, Cedar pollen, caliche dust - directly into your supply. We find this silently operating for years before anyone notices the gray dust on sills or registers.
- Mastic and foil-tape connections baked by six months of 95-105°F attic heat. Alamo Heights attics are brutal from May through October. Older sealants crack, tape adhesive turns to powder, and gaps open at every joint. Conditioned air leaks into the attic; your system runs longer for the same result.
- Galvanized metal sections corroding at seams and fasteners. Original retrofit metal from the 1960s-1970s rusts through at the seams. The blower motor pulls attic air through those gaps, and the corrosion itself sheds particulates into the airstream.
- Degraded duct insulation shedding fibers into the airstream. Compressed, torn, or heat-damaged insulation breaks down. The blower motor picks up those fibers and distributes them through registers. Homeowners change filters repeatedly and still see fine gray accumulation on window sills and furniture.
Pricing for Duct Repair & Sealing in Alamo Heights, TX
| Service | Typical Range in Alamo Heights |
|---|---|
| Mastic sealant touch-up (partial system) | $280-$420 |
| Air leak repair and pressure testing | $260-$540 |
| Flex duct repair / section replacement | $320-$580 |
| Metal duct repair / section replacement | $380-$720 |
| Duct insulation replacement | $340-$620 |
| Full-system sealing (large home) | $550-$850 |
These ranges reflect what we actually quote in Alamo Heights, where attic accessibility varies widely - a walk-up attic in a 1930s Spanish Colonial Revival near Alamo Circle is straightforward; a cramped crawl above a low-slung Craftsman off Austin Highway takes longer. Every quote is written and agreed before work starts, per Haven Standard Clause 1. No per-vent pricing, no add-ons after arrival. Call (830) 549-6847 for an exact figure on your system - estimates are free.
We Also Serve Cities Near Alamo Heights
Our crews work Alamo Heights regularly and also handle duct repair and sealing in New Braunfels, Cibolo, Seguin, and Schertz. Scheduling and dispatch are coordinated from our San Antonio office, with routing optimized to keep appointment windows reliable across the metro area.
Serving Alamo Heights, TX - Our Local Coverage Area
We’re based in the Alamo Heights 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 Alamo Heights
Every four to six years for most Alamo Heights homes, though homes with active flex separation or degraded mastic may need repair attention sooner. The Mountain Cedar pollen load from December through February, combined with six months of continuous AC pulling caliche dust and mold spores, deposits material faster than in climates with milder summers and no comparable pollen event. A camera inspection every three to four years catches separation before it becomes a chronic air quality problem. Call (830) 549-6847 to schedule - estimates are free.
Gray dust after a fresh filter almost always means your duct system is pulling particulates from somewhere other than the return - typically a separated flex liner joint in the attic, degraded insulation shedding fibers, or a corroded metal seam. The filter never sees that material because it enters the supply side downstream. We camera-inspect to locate the source, then repair and seal. On that 1940s Tudor off Sunset Hills, the gray dust stopped only after we rebuilt the separated flex joint and replaced the degraded insulation around it. Call (830) 549-6847 for a camera inspection - estimates are free.
Yes, directly. The December-February Mountain Cedar pollen release, centered on the Edwards Plateau and Bexar County, produces some of the highest airborne pollen counts in the United States. The particles are microscopic - 20-30 microns - and standard 1-inch fiberglass filters in older Alamo Heights homes do not capture them effectively. When flex joints are separated or mastic seals are cracked, that pollen-laden attic air enters the supply ducts and recirculates for months. Proper sealing and repair, verified with pressure testing, is the fix - not another filter upgrade. Call (830) 549-6847 to discuss sealing your system before the next Cedar season.
Usually yes. Uneven airflow typically indicates a disconnected duct run, a collapsed flex section, or a significant leak diverting air into the attic before it reaches the far registers. In Alamo Heights homes with retrofit ductwork routed through complex attic paths, we often find that a single separated joint starves an entire wing of the house. We pressure-test the system, locate the restriction or leak, and repair it - then verify balanced airflow at every register with a blower motor reading. Call (830) 549-6847 to diagnose your system - estimates are free.
We don’t dispatch from New Braunfels for Alamo Heights calls - scheduling and routing are coordinated from our San Antonio office, which keeps drive times routine and appointment windows reliable. Alamo Heights is a standard service area for us, not a distant add-on. Crews carry the full equipment roster - Rotobrush, Nikro negative-pressure extractors, mastic compounds, and common flex and register boot sizes - so most repairs complete in one visit. Call (830) 549-6847 to book - estimates are free.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning New Braunfels, serving Alamo Heights since 2013.