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 Kirby
Duct repair and sealing in Kirby, TX typically runs $280-$740 for most homes, with full-system flex duct replacement on a 1,200-square-foot ranch reaching the upper end. We dispatch crews to Kirby from our San Antonio office, and most Kirby appointments are scheduled within 2-4 business days. Call (726) 600-7155 for a written estimate before any work starts.
Our Duct Repair & Sealing team knows Kirby’s housing stock intimately. This 1.2-square-mile enclave city, completely surrounded by San Antonio, is packed with post-WWII ranch and tract homes built between the 1950s and 1970s. Many of these houses still run original or once-replaced ductwork through unconditioned attics where summer temperatures routinely exceed 140°F. That combination of age, heat, and decades of tenant turnover creates repair needs you won’t find in newer construction. We don’t guess at what’s wrong. We run a camera, show you the photo record, and put a written price in your hand before a single panel comes off.
Why CleanRun Air Duct Cleaning San Antonio Is Kirby’s Preferred Duct Repair & Sealing Company
Kirby homeowners call us because we’ve documented what actually lives inside their ductwork. Since 2013, we’ve served more than 52,000 homes, every one with a written price agreed before work began and a photo record delivered after. That practice started with our first job and hasn’t changed.
Our technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. Tomas Reyes, who leads CleanRun, built this company on the premise that a customer should see evidence before making a decision. No manager-approval policies. No “call for pricing.” Just a written scope, a written price, and a camera showing what we found.
We answer calls with a live person, 24/7. Scheduling for Kirby is coordinated from our San Antonio office, and crews carry the equipment to handle flex duct repair, mastic sealant application, and metal trunk restoration on-site. Our 365-Day Done Right Promise applies to every Kirby job in writing, not as a footnote.
We also offer a Free Second Opinion on any written estimate from a competitor. Bring us another company’s quote. We’ll put our number next to it, item by item, in writing.
Our Duct Repair & Sealing Services in Kirby
Duct Sealing
Kirby’s 1950s-70s homes were built before modern duct-sealing standards existed. The mastic joints at metal trunk connections dry out and crack after a decade of Bexar County’s 140°F attic cycles, letting caliche dust from the region’s soil and unconditioned attic air leak straight into your supply stream. We seal these joints with fresh mastic sealant and, where appropriate, apply aerosol-based duct sealant that reaches leaks a manual brush can’t touch. Every sealed joint is photographed before and after.
Flex Duct Repair
This is where Kirby’s housing stock shows its age most clearly. Original or once-replaced flex duct in these ranch-home attics sags between rafters, kinks at tight turns, and tears its inner liner after years of heat cycling. The result is reduced airflow, trapped debris the blower can’t move, and rooms that never reach set temperature. We replace crushed or torn flex runs with R-8 insulated duct, properly supported and routed. On a 1962 ranch off FM 78, our crew set up negative pressure with HEPA filtration and ran a camera inspection through the supply and return ducts - the main trunk was fine, but three attic flex runs had crushed liners and a disconnected collar at the air handler. We reconnected the collar with mastic sealant, replaced the crushed flex runs with R-8 insulated duct, and the system’s static pressure dropped enough that the blower motor no longer short-cycled.
Metal Duct Repair
The galvanized steel trunks in Kirby’s older homes can last decades, but their seams and takeoff connections don’t. We repair separated seams, replace rusted sections, and rebuild takeoff boxes where flex connects to metal. The work is photographed at every stage. If a trunk is too far gone, we’ll say so in writing and show you why.
Duct Insulation
Unconditioned Kirby attics destroy duct insulation. We replace degraded wrap with new R-6 or R-8 insulation on metal trunks and specify insulated flex where replacement is needed. Proper insulation means your 55°F supply air reaches the register at something close to 55°F, not 68°F after baking through a 140°F attic.
Mastic Sealant Application
Brush-on mastic remains the standard for sealing metal-to-metal and metal-to-flex connections in residential ductwork. We apply it to every joint we disturb during repair work, and we’ll re-seal existing joints that show cracking or separation. The material is rated for the temperature swings Kirby attics deliver.
Air Leak Repair
Disconnected collars, failed tape, and pest damage create leaks that bypass conditioned space entirely. We pressure-test repaired systems to verify sealed operation. The photo record shows every repair location.
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 Kirby
Our crews carry professional-grade equipment from trade-recognized brands: Rotobrush for mechanical agitation in duct runs, Nikro for negative-pressure extraction systems, and Honeywell and Aprilaire components for air quality integration. We don’t stock “proprietary” parts you can’t verify. These are manufacturer-supported tools and materials you can look up independently, and our Kirby crews carry common repair items on every truck to avoid return trips.
Common Duct Repair & Sealing Problems We See in Kirby Homes
- Dried mastic at metal trunk joints cracks after years of 140°F attic heat cycling, creating supply-side leaks that pull dust and fiberglass directly into airflow. We find this in roughly two-thirds of Kirby homes built before 1980.
- Crushed or sagging flex duct runs between rafters, often original to 1960s-70s installation, with torn inner liners that trap debris and reduce delivered airflow by 30% or more. The blower runs longer, the bills climb, and the room stays warm.
- Disconnected collars at the air handler or at register boots, sometimes failed tape, sometimes never properly sealed in the first place. These leaks dump conditioned air into the attic and pull attic air into the return.
- Compacted debris in return runs from 15-25 years without cleaning between tenant turnovers. The restriction overloads the blower motor and masquerades as an equipment problem until a camera shows the actual blockage.
Pricing for Duct Repair & Sealing in Kirby, TX
Most Kirby duct repair and sealing jobs fall between $280 and $740. Here’s how that breaks down for typical work in this market:
| Service | Typical Range in Kirby |
|---|---|
| Mastic sealant reapplication (partial system) | $280-$420 |
| Flex duct repair / replacement (1-3 runs) | $340-$580 |
| Metal trunk repair (seam rebuild, section replacement) | $420-$680 |
| Full-system flex duct replacement (1,200 sq ft ranch) | $580-$740 |
| Duct insulation replacement (partial) | $260-$480 |
What moves a job toward the higher end: multiple crushed flex runs, rusted metal sections requiring replacement rather than repair, or systems with original 1960s debris loads that require extended cleaning before sealing work can begin. We put the full scope and price in writing before work starts, every time, under Haven Standard Clause 1. No per-vent pricing. No add-ons after arrival. Estimates are free. Call (726) 600-7155.
We Also Serve Cities Near Kirby
Our crews work throughout Bexar County and surrounding communities. In addition to Kirby, we regularly schedule duct repair and sealing in San Antonio, Alamo Heights, Castle Hills, and Terrell Hills. Scheduling is coordinated from our San Antonio office with local crew dispatch to each area.
Serving Kirby, TX - Our Local Coverage Area
We’re based in the Kirby 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 Kirby
We find debris loads consistent with original 1960s installation, including older insulation materials no longer used in modern ductwork, compacted caliche dust from Bexar County soil, and layers of tenant-era accumulation that restrict airflow and overload the blower. The camera shows this before we touch a tool. Call (726) 600-7155 for a free estimate and we’ll show you what’s in your system.
Cleaning removes debris but doesn’t fix the leaks that let new debris in. Kirby’s 1950s-70s homes have dried mastic, failed tape, and disconnected collars that bypass conditioned air into the attic and pull attic air into your supply. Sealing stops the cycle. We clean first, seal second, and photograph both.
Usually yes. In Kirby’s ranch homes, a hot room typically means a crushed flex run, a disconnected collar, or a kinked duct section in the attic that’s reducing or eliminating airflow to that register. We verify with a camera and pressure test before recommending repair. The fix is often simpler than replacing the HVAC unit.
Yes. Because many Kirby rentals near the I-10 East corridor have seen 40-50 years of successive tenants with no landlord-mandated duct maintenance, we routinely find systems that haven’t been touched since the Reagan administration. That history means more compacted debris, more deteriorated flex, and more failed seals than in owner-occupied homes with regular service records.
We pressurize the system and use a calibrated flow hood to measure delivered airflow at each register, then run a camera through every accessible duct run. The combination shows where air is escaping and where debris is accumulating. No drywall comes down. No insulation gets disturbed until we show you the photo record and you approve the written scope.
Ready to see what’s actually inside your ducts? Call (726) 600-7155 for a free written estimate. We’ll run a camera, show you the photo record, and put a flat price in your hand before any work starts. Every Kirby job is backed by our 365-Day Done Right Promise and the full H.A.V.E.N. Standard.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning San Antonio, serving Kirby since 2013.