Fast, Reliable Duct Repair & Sealing Across Boerne
Duct repair and sealing in Boerne typically runs $180-$650 depending on whether we’re patching a single flex run or resealing an entire trunk line, and most jobs are finished in one visit. Our Duct Repair & Sealing crew has worked the full stretch of Boerne from the historic stone cottages along Main Street in 78006 to the newer master-planned communities up in 78015. We know the difference between a quick mastic touch-up and a full flex replacement, and we don’t leave until the camera shows airtight results. Call (844) 685-6342 for a free estimate - we’ll give you the honest price before a single tool comes out of the van.
Why Bellows Air Duct & Vent Co. Is Boerne’s Preferred Duct Repair & Sealing Company
We’ve been driving out to Boerne since the early 1990s, back when Highway 46 was still a two-lane ranch road. That history means something here. Homeowners in Timberwood Park and Leon Valley know our trucks, and we’ve built a reputation on showing up when we say and fixing it so it stays fixed.
Our reviews from Boerne customers consistently mention the same things: the technician explained what was wrong before touching anything, the price matched the quote, and the camera footage proved the job was done. We’re not chasing five-star ratings with discount coupons - we’re chasing the kind of customer who calls us back five years later for their next house.
Response time to Boerne is typically same-day or next-morning, depending on whether you’re off I-10 near the Rim or farther north toward Welfare. Calls are answered by a live person 24 hours a day, not an app or a callback queue. That’s been our way for over 42 years.
Ray Castillo, who leads Bellows, grew up in the trades and built this company on the K.E.Y.S. values code - every technician is background-checked, uniformed, and trained to answer to a real person at the office, not a dispatch algorithm.
Our Duct Repair & Sealing Services in Boerne
Duct Sealing
Boerne’s heavy AC runtime from May through October keeps blower fans cycling constantly, pulling Hill Country limestone dust and cedar pollen through every gap in your ductwork. We seal with professional-grade mastic and reinforced tape, then verify with before-and-after camera inspection. In the 78015 subdivision of Esperanza, we repaired a flex duct system where limestone caliche dust had eroded the mastic seals at the plenum. We replaced the damaged flex runs and applied heavy-duty mastic tape rated for Hill Country dust, ensuring the system stayed airtight despite ongoing construction nearby. A typical duct sealing job in Boerne runs $280-$480 for a standard residential system.
Flex Duct Repair
The builder-grade flex ductwork in 78015 communities like Esperanza and Mirror Oak was never meant to handle the abrasive caliche dust that gets kicked up during Hill Country lot grading. Joints pop open. Inner liners tear. We replace damaged runs with thicker-walled flex rated for high-velocity systems, then seal with mastic, not duct tape. Flex duct repair in Boerne typically costs $180-$340 per run, with most homes needing two to four runs addressed.
Metal Duct Repair
The older 78006 corridor - mid-century ranch homes and historic stone cottages along River Road and Balcones Creek - still runs original galvanized metal ductwork that was never sealed to modern standards. These systems sweat during Boerne’s intense short-burst rainstorms, rust at the seams, and leak conditioned air into attics and crawl spaces. We patch, replace sections, and apply two-part epoxy sealant where metal has corroded through. Metal duct repair in Boerne runs $320-$650 depending on accessibility and extent of corrosion.
Duct Insulation
Uninsulated or degraded duct insulation is a recurring problem in Boerne’s newer subdivisions, where humidity spikes after rainstorms create condensation inside flex ducts. We install foil-faced fiberglass insulation with proper vapor barriers, sized for the temperature swings of the Hill Country. Duct insulation work in Boerne typically ranges $400-$800 for a complete system wrap.
Mastic Sealant Application
Mastic is the only sealant we trust for Boerne conditions. Duct tape dries and fails; mastic stays flexible. We apply it heavy at plenum connections, trunk splits, and register boots - the exact points where limestone dust abrasion causes failure in 78015 homes. Mastic sealing as a standalone service runs $250-$450.
What happens when you call
- 1
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.
Trusted Brands We Service in Boerne
We carry parts from Abatement Technologies, Rotobrush, and Aprilaire on every truck serving Boerne - brands serious HVAC contractors specify, not hardware-store substitutes. That means when we’re working a detached workshop off Scenic Loop Road or a historic cottage near the Cibolo, we don’t waste a trip ordering parts. Most repairs are completed in a single visit because we’ve seen these systems before and we stock what breaks.
Common Duct Repair & Sealing Problems We See in Boerne Homes
- Flex duct joints pop open from high-velocity airflow on oversized systems. Boerne’s newer 78015 homes often have HVAC systems that are too large for the ductwork, creating pressure that blows apart mastic seals at the plenum. We resize or replace flex runs and balance airflow to prevent repeat failures.
- Mastic seals crack and peel from limestone dust abrasion. The fine white caliche dust from Hill Country lot grading works its way into duct seams like sandpaper. In 78015 communities, we see two-year-old seals failing that should last fifteen. We use heavier-grade mastic and reinforced mesh tape designed for abrasive environments.
- Uninsulated metal ducts sweat and rust during intense rainstorms. Historic 78006 cottages with original galvanized trunk lines lose conditioned air to attic humidity. The rust isn’t just surface - it eats through seams and creates leaks that show up as hot spots in summer and cold drafts in winter.
- Cedar pollen coats return systems and recirculates for months. Boerne’s position in the densest concentration of Ashe juniper in the Texas Hill Country means December-February pollen events that generic duct guides don’t address. Sealed returns and properly filtered fresh-air intakes are the fix, not just a better furnace filter.
Pricing for Duct Repair & Sealing in Boerne, TX
Here’s what duct repair and sealing costs in Boerne’s market:
| Service | Typical Range |
|---|---|
| Single flex duct repair/replacement | $180-$340 |
| Mastic sealant application (standard system) | $250-$450 |
| Full duct sealing (per system) | $280-$480 |
| Metal duct section repair | $320-$650 |
| Duct insulation (complete system) | $400-$800 |
What moves the number: accessibility (crawl space vs. attic), how many runs need attention, and whether we’re matching existing materials or upgrading to heavier-duty products. We don’t do bait pricing - the number we give on the phone is the number on the invoice, and we show you the camera footage before we leave. Ask about our $50 Off Any Repair Over $250, or the $89 Seasonal Tune-Up if you want us to inspect before committing to repairs. Seniors and veterans receive a permanent 5% discount.
We Also Serve Cities Near Boerne
Our service radius covers Timberwood Park to the southeast, Leon Valley and Live Oak toward San Antonio, and Lackland Air Force Base for military families who’ve bought homes in the Boerne area. Same trucks, same technicians, same upfront pricing - whether we’re working your place in Boerne or your rental property in Leon Valley.
Serving Boerne, TX - Our Local Coverage Area
We’re based in the Boerne 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 Boerne
Limestone caliche dust from Hill Country lot grading abrades standard mastic seals faster than in other markets. The fine white powder gets pulled into duct seams by blower pressure and acts like sandpaper against the sealant surface. We use heavy-duty mastic tape rated for abrasive environments and apply it thicker at high-stress joints. Call (844) 685-6342 for a free inspection - estimates are free.
Yes. Historic 78006 cottages often have original galvanized metal ductwork that was never sealed to modern standards, with rust from decades of humidity exposure. Newer 78015 homes have builder-grade flex duct that’s vulnerable to dust abrasion and pressure damage from oversized systems. The repair approach is completely different - metal patching and epoxy versus flex replacement and airflow balancing. We’ll tell you which you’re dealing with after camera inspection.
We can repair ductwork in detached workshops, guest houses, and outbuildings throughout Boerne’s acreage properties, including those with oversized access doors. The same flex duct and mastic sealing principles apply, though we often see more extreme temperature swings in unconditioned structures that require heavier insulation. We’ll assess whether your workshop ducts need standard repair or upgraded materials for the exposure.
Proper duct sealing reduces pollen infiltration significantly, but it’s only part of the solution. Sealing return ductwork and filter housings prevents the Boerne-specific Ashe juniper pollen from being drawn into the system and recirculated. We also check fresh-air intakes and recommend filtration upgrades during sealing work. The combination of sealed ducts and proper filtration is what addresses Boerne’s uniquely brutal cedar season.
Yes. In Esperanza and similar 78015 communities, we install foil-faced fiberglass insulation with vapor barriers that protect flex duct from both dust abrasion and humidity damage. The insulation adds a physical buffer layer and prevents condensation that can compound dust buildup. Duct insulation in these subdivisions typically runs $400-$800 for a complete system. Call (844) 685-6342 for an exact quote - estimates are free.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Boerne since the early 1990s.