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 Castle Hills
Duct repair and sealing in Castle Hills, TX typically runs $280-$650 for most residential jobs, with full-system resealing on mid-century ranch homes reaching $800-$1,400 when panned-floor returns and collapsed flex-duct sections need rebuilding. We’re usually scheduling 2-4 days out for Castle Hills, with dispatch coordinated from our Dallas-Fort Worth office and crews working these neighborhoods regularly enough to know the local mechanical code.
Castle Hills sits as its own incorporated city, completely surrounded by San Antonio, and that distinction matters when a crew opens your attic. The homes here were built almost entirely between 1950 and 1972, and their original ductwork - sheet-metal trunk lines, panned-floor returns, early flex-duct - was sized for window units and low-capacity furnaces, not the modern high-efficiency air handlers now attached to them. We see the mismatch every week: mismatched static pressure, collapsed inner liners, and joints that have worked loose through decades of thermal cycling in attic spaces that hit 140°F in July. Call (726) 600-7155 for a written estimate. We’ll put the number on paper before any panel comes off.
Why CleanRun Air Duct Cleaning San Antonio Is Castle Hills’s Preferred Duct Repair & Sealing Company
We’ve been pulling Castle Hills mechanical permits since 2013, and our crews know the difference between San Antonio’s inspection process and Castle Hills’s independent municipal code. That matters when a job requires permit documentation for insurance or resale. Haven Standard Clause 3: Verified Crews means every technician is background-checked, uniformed, and identified by name before arrival.
Our Duct Repair & Sealing team has documented photo records from over 52,000 homes, including hundreds in Castle Hills proper and the immediate surrounding area. The photo record is not a bonus; it’s a standard deliverable on every job, showing the inside of every duct run before and after work.
Response time to Castle Hills runs 2-4 days for standard scheduling, not because we’re slow, but because duct repair and sealing is a scheduled trade job that requires a written scope, permit verification where applicable, and proper equipment loadout. We do not bait with $79 coupons and upsell on arrival. Haven Standard Clause 1: written price before any work starts, every time.
Our Free Second Opinion on Any Written Estimate means you can bring a competitor’s Castle Hills quote and we’ll put our number next to it, line item by line item, in writing, at no cost.
Our Duct Repair & Sealing Services in Castle Hills
Duct Sealing with Mastic Sealant
Castle Hills’s mid-century ranch homes rely heavily on panned-floor returns - sheet-metal channels formed between floor joists that pull return air from living spaces back to the air handler. These pan assemblies separate at the seams after sixty-plus years of expansion and contraction. We seal them with mastic sealant, a fiber-reinforced compound that remains flexible and is rated for the temperature swings these attic systems see. Brush-on tape alone fails within two seasons here. Mastic is slower to apply. It holds.
Flex Duct Repair
First-generation flex-duct in Castle Hills ranches, installed from the 1960s through early 1980s, uses a wire-helix inner liner that collapses when the fiberglass insulation wrap compresses or the outer jacket tears. Homeowners call us convinced they need a new blower motor or air handler because airflow at the registers dropped to a whisper. Camera inspection usually shows a crushed flex section upstream, sometimes at an elbow where the original installer left too tight a bend radius. We cut out the damaged section and rebuild with properly supported flex or transition to metal where the run allows. The 365-Day Done Right Promise covers the repair; if airflow drops again, we make it right.
Metal Duct Repair
Original sheet-metal trunk lines in Castle Hills homes were fabricated with snap-lock seams and single-wall construction. Thermal cycling opens these seams, and the metal fatigues at hanger points. We spot-repair with metal patches and sealed rivets where the trunk is structurally sound, or recommend sectional replacement where corrosion or physical damage has compromised the line. Every repair is photographed and included in the documented photo record delivered at job completion.
Duct Insulation Replacement
Attic temperatures in Castle Hills exceed 130°F regularly from June through September. Fiberglass duct insulation degrades, compresses, and delaminates over decades in that environment. We replace with new wrap rated for the application, sealed at all seams, and verify that the R-value meets or exceeds what the original system specified. On homes where the original ductwork was undersized for current equipment, proper insulation becomes even more critical; the air handler is already working harder than designed, and uninsulated or poorly insulated runs add thermal loss the system cannot overcome.
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 Castle Hills
Our equipment roster includes Rotobrush rotary brush systems for mechanical agitation inside duct runs, Nikro negative-pressure extractors for controlled debris removal, and Honeywell and Aprilaire air quality components where filtration upgrades accompany sealing work. We stock common flex-duct diameters, mastic sealant, and metal repair materials locally, so Castle Hills jobs don’t wait on parts orders. Customers can verify each manufacturer independently; we do not make performance claims beyond published specifications.
Common Duct Repair & Sealing Problems We See in Castle Hills Homes
- Panned-floor returns pulling apart at seams. These 1950s-70s ranch homes use return-air pathways formed between floor joists, sealed with sheet metal and mastic that has dried and cracked over sixty years. Attic air - dust, pollen, 130°F heat - leaks directly into the supply path through gaps you cannot see from the living space.
- First-generation flex-duct collapsed internally. The wire helix inside early flex-duct kinks or compresses, especially at elbows and where insulation has settled. Homeowners replace blowers and air handlers unnecessarily because the restriction is hidden inside a finished attic space.
- Cedar pollen and dust loading through unsealed joints. The December-February mountain cedar season in Castle Hills produces some of the highest pollen counts in the United States. Homes seal up tight; recirculation through leaky ductwork concentrates the load. Leaks that were minor in summer become the dominant particulate path during seal-up.
- Ductwork mismatched to modern equipment. Original systems sized for 3-ton or smaller capacity now serve 4-ton high-efficiency air handlers. Static pressure runs high, airflow drops, and the equipment cycles inefficiently. Sealing alone cannot fix undersizing, but proper sealing and targeted repair can recover performance the homeowner assumed was lost.
Pricing for Duct Repair & Sealing in Castle Hills, TX
Most Castle Hills duct sealing jobs fall between $280 and $650. Full-system resealing with mastic on a 1,800-square-foot ranch, including panned-floor return repair and multiple flex-duct sections, typically runs $800-$1,400. Flex-duct repair or replacement of individual runs ranges $180-$420 per run depending on length and attic access. Metal duct patch repair starts around $220; sectional trunk replacement runs higher based on material and labor.
What moves the number: attic accessibility, extent of existing damage, whether Castle Hills permits are required for the scope, and whether the system needs cleaning before sealing can be performed effectively. We deliver a written price before any work starts, every time, under Haven Standard Clause 1. No per-vent pricing. No coupon bait. Call (726) 600-7155 for a free estimate; we’ll inspect, photograph, and put the scope and price in writing.
We Also Serve Cities Near Castle Hills
Our crews work throughout the San Antonio metro area, including Castle Hills and neighboring Alamo Heights, Terrell Hills, and Leon Valley. Each city has its own mechanical permit requirements and housing stock characteristics; we adjust scope and documentation accordingly.
Serving Castle Hills, TX - Our Local Coverage Area
We’re based in the Castle Hills 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 Castle Hills
Every 18-24 months for Castle Hills homes with original or first-generation ductwork, and annually if residents have cedar pollen sensitivity or if the home sits near unpaved roads or open land that increases dust loading. The December-February mountain cedar season recirculates concentrated pollen through unsealed joints, so a post-cedar inspection in March identifies leaks before summer heat makes attic work miserable. Call (726) 600-7155 to schedule; estimates are free.
Yes. Castle Hills is an incorporated city with its own building and mechanical code, and duct sealing or repair that modifies the distribution system requires a Castle Hills permit, not a San Antonio permit. Contractors who default to San Antonio’s process routinely find themselves out of compliance. We pull Castle Hills permits as standard practice on permitted scopes; the permit number and inspection documentation are included in your job record.
The cleaning removed accumulated debris but did not fix the leak path. In Castle Hills ranches, disconnected panned-floor returns and unsealed joints pull attic dust directly into the supply stream; the cleaning addressed the symptom, not the breach. Camera inspection identifies the leak source, and mastic sealing or repair closes it. We include before-and-after photos of the leak itself, not just the cleaned duct, so you can see the difference.
Often, yes. Original sheet-metal trunk lines in these homes are structurally robust; spot repair with metal patches, sealed rivets, and fresh mastic returns them to serviceable condition. Collapsed first-generation flex-duct can be sectionally replaced without touching sound adjacent runs. We photograph the damage, explain what can be repaired versus what must be replaced, and put both options in writing with their prices before any work starts.
The December-February cedar season produces pollen counts among the highest in the United States, and Castle Hills homes seal up tight against it. Unsealed duct joints become the primary recirculation path, concentrating pollen in bedrooms and living spaces for months. Post-cedar duct inspection and sealing in March closes these paths before the summer cooling season begins. For allergy-sensitive households, this timing is more valuable than a mid-summer cleaning alone.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Castle Hills and the greater San Antonio area since 2013.