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 Leon Valley
Duct repair and sealing in Leon Valley typically costs $280-$650 for most residential jobs, with full-system mastic sealing and insulation running $800-$1,400 depending on the home’s layout and duct condition. Most Leon Valley homes we see need more than a quick patch - the 1950s through 1970s ranch stock here has ductwork that’s simply reached the end of its service life after decades of near-continuous cooling.
We serve Leon Valley from our San Antonio dispatch office, and our crews know the area well enough to recognize the patterns: original fiberglass duct board shedding fibers in the attic, unsealed sheet-metal joints pulling in Hill Country dust, and flex duct that’s hardened and cracked from years of summer heat. If your system is cycling too often, rooms won’t balance, or you’re seeing dust settle right after cleaning, the problem is almost always in the ductwork itself. Call (830) 549-6847 and we’ll put a written price in front of you before any work starts.
Why CleanRun Air Duct Cleaning New Braunfels Is Leon Valley’s Preferred Duct Repair & Sealing Company
We’ve worked on enough Leon Valley homes to know what we’re walking into. The uniformity of the housing stock here - post-WWII ranch homes built roughly 1952 through the 1970s - means our technicians can often predict the duct condition before we open the attic hatch. That local familiarity saves time and means fewer surprises for the homeowner.
Our Duct Repair & Sealing in Leon Valley work is backed by the same documented process we use everywhere: written price before work begins, background-checked uniformed technicians identified by name before arrival, and a photo record of every duct run delivered as part of the standard job record. Haven Standard Clause 1 - written upfront pricing - applies on every call, no exceptions.
CleanRun was established in 2013 and has served over 52,000 homes, every one with a written price agreed before work started and a documented photo record when the crew left. The 365-Day Done Right Promise is backed in writing on every job, not just stated in marketing copy. If the work isn’t right, we make it right.
All calls are answered by a live person, 24/7, and scheduling is coordinated from our San Antonio office with local crews dispatched to Leon Valley. We’re not guessing at drive times or neighborhood layouts - we know Evers Road from Grissom, and we know which blocks still carry the original 1960s duct systems.
Our Duct Repair & Sealing Services in Leon Valley
Duct Sealing
Unsealed duct joints are the single biggest efficiency killer in Leon Valley’s older ranch homes. Sheet-metal connections that were never properly sealed leak conditioned air into the attic, and in summer that means your system runs longer to cool the same space. We seal every accessible joint with mastic and reinforced mesh - not tape, which degrades - and pressure-test the system to verify the seal. In Leon Valley’s climate, where AC runs five or more months nearly around the clock, this alone typically drops energy bills 15-25 percent.
Mastic Sealant Application
Mastic is a water-based sealant that remains flexible after curing, which matters in attics that hit 140 degrees in August. We brush or spray mastic onto every joint, seam, and penetration in the duct system, then embed fiberglass mesh at stress points for reinforcement. This is the correct method for Leon Valley’s original sheet-metal and duct-board systems - foil tape dries and fails, and duct tape was never designed for this application. Our crews carry Nikro and Abatement Technologies application equipment rated for the high particulate loads we find in this market.
Flex Duct Repair
Early flex duct, common in Leon Valley’s 1960s and 1970s builds, hardens and cracks where it bends across attic trusses. We replace failed sections with new insulated flex, secure it with proper tension straps, and seal every connection with mastic. The new material carries a higher R-value than what was installed originally, which matters in attics that see extreme temperature swings.
Metal Duct Repair
Original galvanized sheet metal in Leon Valley’s 1950s and early 1960s homes corrodes at seams and where insulation has trapped moisture. We cut out damaged sections, fabricate replacement pieces on site, and weld or mechanically lock new metal to old. Every repair is sealed and insulated to match the surrounding system.
Duct Insulation
Insulation on Leon Valley’s original ductwork has compressed, torn, or simply fallen away in many attics. We re-wrap supply trunks and exposed runs with formaldehyde-free fiberglass insulation, secured with mechanical fasteners and sealed at seams. Proper insulation keeps delivered air within 2-3 degrees of setpoint, rather than losing 10-15 degrees through a hot attic.
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 Leon Valley
Our equipment roster includes Rotobrush, Nikro, Abatement Technologies, Honeywell, and Aprilaire - professional-grade tools you can look up independently before agreeing to any work. We stock common repair materials locally for Leon Valley jobs, including mastic, reinforced mesh, and insulated flex duct in standard diameters, which means most repairs are completed in a single visit without waiting on parts. For components we don’t carry, our San Antonio office maintains same-day supplier relationships with regional HVAC distributors.
Common Duct Repair & Sealing Problems We See in Leon Valley Homes
- Delaminating duct board. The original fiberglass duct board installed in Leon Valley’s 1950s-1970s homes breaks down after decades of continuous airflow and heat cycling. We regularly find the inner liner separating from the fiberglass core, shedding visible fibers into the airstream and reducing structural integrity at every elbow and transition.
- Cedar pollen infiltration through unsealed joints. Leon Valley sits closer to the Ashe juniper belt than any east- or south-side San Antonio neighborhood, and winter pollen plumes infiltrate through gaps in sheet-metal connections and old flex cuffs. The result is a sticky, accumulated allergen load that standard filter changes cannot address.
- Deferred maintenance in former rental properties. A high share of Leon Valley homes rotated through military families assigned to nearby Lackland AFB, and ductwork maintenance was chronically deferred. We commonly find 20-plus years of caliche-laden dust and debris in systems that appear recently updated from the curb.
- Thermal loss from failed attic insulation. Compressed or missing insulation on original duct runs forces systems to run longer to deliver the same cooling, accelerating wear on the HVAC equipment and driving summer electric bills well above what the home’s square footage would predict.
Pricing for Duct Repair & Sealing in Leon Valley, TX
Most Leon Valley duct sealing jobs run $280-$650 for partial-system work, and $800-$1,400 for complete mastic sealing and re-insulation of a typical 1,500-2,200 square foot ranch home. Flex duct replacement is typically $180-$340 per run, and metal duct repair starts around $220 for accessible sections, scaling up if we need to open soffits or chase walls.
What moves the price: the accessibility of the ductwork (crawl space vs. walkable attic), the extent of damage, whether we’re sealing existing material or replacing failed sections, and the linear footage involved. Every job gets a written price before any work starts - Haven Standard Clause 1 - and our Free Second Opinion means you can bring us a competitor’s written estimate and we’ll put our number next to it at no cost.
Call (830) 549-6847 for an exact quote. Estimates are free.
We Also Serve Cities Near Leon Valley
Our crews work throughout the metro area, including Leon Valley and surrounding communities. We also serve homeowners in New Braunfels, Cibolo, Seguin, and Schertz with the same documented process: written price first, photo record on every visit, and the 365-Day Done Right Promise backed in writing.
Serving Leon Valley, TX - Our Local Coverage Area
We’re based in the Leon Valley 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 Leon Valley
Every 3-4 years for inspection, with sealing or repair as needed. The caliche dust from unpaved roads in and around Leon Valley loads duct systems faster than paved suburban neighborhoods, and that dust is abrasive to seals and insulation. We recommend a camera inspection every three years to catch delaminating duct board or failed mastic before the problem spreads downstream. Call (830) 549-6847 to schedule - estimates are free.
Yes, measurably. Leon Valley’s position on San Antonio’s northwest edge puts it directly in the path of Ashe juniper pollen plumes from December through February, and that pollen infiltrates through unsealed duct joints in concentrations we don’t see on the east or south side of the metro. The pollen is sticky and accumulates on duct lining, becoming a reservoir that releases with every air-handler cycle. Proper mastic sealing of all joints and connections is the only effective fix. Call (830) 549-6847 for an inspection.
Typically worse than the exterior suggests. Military-family rental turnover in Leon Valley meant duct maintenance was often deferred across multiple occupants, and we regularly find 20-plus years of accumulated debris in systems that look recently painted and updated from the outside. The camera doesn’t lie - we document what we find and show you before proposing any work. Call (830) 549-6847 for a written estimate.
It stops conditioned air from leaking into the attic and unconditioned air from being drawn into the system. In Leon Valley’s 1952-1970s ranch stock, original sheet-metal joints were rarely sealed properly and flex connections have hardened and cracked. Mastic sealing restores system efficiency, reduces the dust load, and often resolves room-to-room temperature imbalances that homeowners have accepted for years. Most sealed systems cycle 20-30 percent less in peak summer. Call (830) 549-6847 for a written price on your home.
Yes, when the ductwork is accessible and the system can be safely worked on. Leon Valley properties with rural lots often have shop buildings, guest quarters, or converted garages with independent duct systems that have been exposed to the same dust and pollen loading as the main house. We inspect, photograph, and quote these the same way - written price before work, documented photo record after. Not every outbuilding system is worth repairing, and we’ll tell you directly if replacement makes more sense. Call (830) 549-6847 to discuss your setup.
Ready to see what’s actually inside your ductwork? Call CleanRun at (830) 549-6847. We’ll answer with a live person, schedule a time that works, and put a written price in front of you before any panel comes off. Every job includes a Documented Photo Record of every duct run, delivered as part of your standard job record, and the 365-Day Done Right Promise is backed in writing - not just stated in marketing copy.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning New Braunfels, serving Leon Valley since 2013.