Whole-home duct cleaning
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Sanitizing & deodorizingWhole-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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AfterHow Much Does Duct Repair & Sealing Cost in San Antonio?
Duct repair and sealing in San Antonio typically costs between $285 and $890 for most jobs, with whole-home duct sealing averaging $1,900 to $3,400 depending on square footage and access. Smaller repairs like patching a visible tear or resealing a single supply boot usually land in the $180 to $400 range. The final number depends on how much of your ductwork is accessible, how old the system is, and whether the work happens in an attic, crawlspace, or slab.
At Linden Air Duct San Antonio, we put every price in writing before any work starts. That means the figure you approve is the figure you pay, no end-of-job surprises. Marcus Veale and our team have been doing this since 2004, and we’d rather walk you through exactly what your ducts need than leave you guessing at a number.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what we’re seeing across San Antonio in 2026 for common duct repair and sealing work. These ranges reflect our actual market, from Alamo Heights to Stone Oak to Helotes.
| Job Type | Typical Cost Range | What It Includes |
|---|---|---|
| Single duct leak repair (visible tear or hole) | $180 – $350 | Access, patch or mastic seal, retest at that point |
| Supply boot reseal (where duct meets floor or ceiling register) | $150 – $300 per boot | Remove register, reseal connection, reinstall register |
| Duct section replacement (5 to 10 linear feet) | $350 – $700 | Remove damaged flex or rigid duct, install new section, seal connections |
| Plenum repair (at the air handler) | $250 – $550 | Seal or patch supply or return plenum connections |
| Return air duct repair | $300 – $750 | Depends on location and whether return chase needs work |
| Whole-home duct sealing (aeroseal or manual) | $1,900 – $3,400 | Average 1,800 to 2,600 sq ft home, full supply and return system |
| Duct insulation wrap (after repair) | $3 – $6 per linear foot | R-6 or R-8 wrap installed over existing ducts |
San Antonio homes run slightly higher on the sealing end than some markets because so many of our systems live in attics, where summer heat can exceed 140 degrees. Duct failures here tend to happen at connection points where the heat cycling loosens tape and mastic over time. A tech who knows what that looks like can often spot the failure pattern in the first 20 minutes.
What Affects Duct Repair & Sealing Pricing in San Antonio
- Access and location. Attic ductwork in a single-story far West Side home is usually faster to reach than ducts run through a pier-and-beam crawlspace in Monte Vista. Slab ductwork, common in older Alamo Heights homes, adds real complexity because it may require scoping before we can even scope the repair.
- Age and condition of the ducts. A 25-year-old flex system that’s brittle will tear again next to the repair if it’s not reinforced. We’ll tell you when a patch makes sense and when replacement of a section is actually the cheaper long-term call.
- Leak test complexity. A duct blaster test or thermal imaging pass adds $150 to $350, but when you have mystery hot and cold rooms, it’s often the fastest way to find every leak in one visit instead of chasing symptoms across three visits.
- Number of leaks found. One visible tear is quick. Five leaks spread across three supply runs is a different job. Pricing follows the actual work, not a flat “sealing package” that may overcharge or underdeliver.
- Material type. Rigid galvanized ducts cost more to repair than flex, but they also tend to fail less often. Flex is cheap to replace but fails earlier, especially in the heat cycling of our summers.
- Mold or pest findings. If we open a duct and find rodent damage in a Helotes attic or mold growth from a past condensation problem, that changes scope. We’ll show you the photo, explain what we found, and put a revised price in writing before touching anything further.
Signs You Need Duct Repair or Sealing
Most San Antonio homeowners call us after noticing one of these five things. If more than one is true in your home, the leak is probably not small.
- Rooms that never match the thermostat. The far bedroom in a two-story north-side home is 7 degrees warmer in July than the living room. That’s usually a supply duct disconnected somewhere in the attic run.
- Dust that comes back within days. A leak on the return side pulls attic or crawlspace air, including fine dust and insulation fibers, into the system and redistributes it through the house.
- Higher electric bills without a hotter thermostat setting. CPS Energy bills climb with leaked air because the system runs longer to hit the same setpoint. Sealing typically drops run time. You can read more about how this works on our Duct Repair & Sealing in San Antonio page.
- Whistling or faint hissing near supply grills. Air escaping through a loose connection makes noise at certain system pressures. If it changes as the blower ramps, that’s a connection issue.
- Dryer-like lint buildup around wall vents. If you see lint or dust streaking around your supply registers, that can mean attic air is being pulled into the supply stream through gaps at the boot.
Repair vs. Replace: What Makes Sense in San Antonio
If your ducts are under 10 years old and the failures are at connection points, repair and reseal is almost always the right call. A well-executed mastic and mesh seal at a boot or plenum can outlast the rest of the system.
If the ducts are 20-plus years old, original to the house, and the flex inner liner is delaminating, patching becomes whack-a-mole. You’ll pay $300 now, $400 in six months, and another $500 a year later, when a full re-duct of the accessible runs might have cost $3,500 to $5,000 once. We’ll give you that honest math in writing and let you decide. Marcus Veale’s rule is simple: if we wouldn’t spend the money on our own home, we say so out loud.
Here’s a practical way to think about it. In a 1990s-era home in the Churchill Estates area, if the ducts are original, you’re probably past the point where sealing alone solves your comfort problem. The materials simply weren’t made to handle 30 San Antonio summers. In a 2015-era home in Alamo Ranch, a disconnected boot is a $200 fix, and replacing anything more would be overkill.
How to Save on Duct Repair & Sealing
There are a few ways to keep the number reasonable without cutting corners on the work itself.
- Get a written, itemized price. A vague “sealing package” quote hides assumptions. An itemized line for each leak, boot, or section tells you exactly what you’re approving. We do this on every single job, no exceptions.
- Ask for a leak test before sealing. Spending $200 to find every leak once is cheaper than paying for three separate repair visits. On systems with five or more problem spots, the test pays for itself.
- Bundle routine cleaning with repairs. If you’re already having ducts repaired, having the full system cleaned at the same time avoids pulling a vacuum setup in a second time. The marginal cost of cleaning during a repair visit is usually lower than a standalone call.
- Prioritize the return side first. Return leaks pull attic air directly into your living space. Sealing those first gives you the biggest air-quality gain for the dollar, even if supply leaks remain temporarily.
- Don’t wait on visible damage. A small tear at a boot connection is a $200 repair today. A disconnected duct run that dumps conditioned air into the attic for six months is a higher repair bill and six months of wasted electricity.
For an exact number on your system, call (430) 233-7681. Estimates are free, and the price we quote is the price in writing before any work is done.
How Linden Air Duct San Antonio Does Duct Repair Differently
Here’s what happens when you call us. A real person answers the phone, any hour, any day. That’s been true since we opened our doors in 2004, and it still holds. You’ll speak to someone who can schedule your visit and answer basic questions without bouncing you through a voicemail tree.
Before the tech arrives, you’ll receive their name and photo. When they ring the bell, they’ll be in a clean, marked uniform, and they’ll show you a photo ID badge at the door. That’s the Threshold Standard, and it applies to every technician we send. You never have to wonder who’s walking into your home.
Every repair gets two things in writing before work starts: the price and the guarantee. Our 365-Day Done Right Promise covers the repair for a full year. If it doesn’t hold, we return at no charge. That’s not a sales line; it’s part of the written paperwork on every job.
We run professional-grade equipment including Rotobrush and Nikro systems, and we work with air-quality products from Honeywell, Aprilaire, Abatement Technologies, and Guardsman. That matters because the sealants, tapes, and mastics we use have to survive San Antonio attic temperatures that bake cheap materials into failure within a year or two.
FAQs – Duct Repair & Sealing Cost
How much does it cost to seal ductwork in San Antonio?
Whole-home duct sealing in San Antonio runs $1,900 to $3,400 for an average 1,800 to 2,600 square foot home. Smaller, targeted sealing jobs at a specific boot or plenum run $150 to $550. We’ll test your system and give you a written number for your actual ductwork before any work begins. Call (430) 233-7681 for a free estimate.
Is duct sealing worth the money?
For most San Antonio homes with attic duct systems, yes. The Department of Energy estimates typical duct systems lose 20 to 30 percent of conditioned air through leaks. At CPS Energy rates, sealing a leaky system often pays for itself in 12 to 24 months through reduced run time on your AC. The comfort difference in previously hot or cold rooms is noticeable within a day.
How long does duct sealing last?
Professionally applied mastic seals and properly installed mechanical connections typically last 10 to 20 years, often outlasting the flex duct they connect. Our repairs carry a 365-Day Done Right Promise in writing, and if a covered repair fails within that year, we return at no charge.
Can you repair just one duct?
Yes. If a single supply run has a visible tear or disconnected boot, that’s a $180 to $350 repair in most San Antonio homes. You don’t have to buy a whole-home sealing package to fix one problem. We’ll show you the damage and give you an itemized price for just that repair.
How long does duct repair take?
Most single-point repairs take 1 to 2 hours once the tech is on site. Whole-home sealing on a typical San Antonio house is a single-day job, usually 5 to 8 hours depending on access and system size. We’ll confirm the timeline at the start of the visit and keep you updated if anything changes.
Do you give free estimates for duct repair in San Antonio?
Yes. We provide written, itemized estimates at no charge. The price you approve is the price you pay. Call (430) 233-7681 and a real person will answer, 24/7, and schedule your estimate.
Pricing reflects the San Antonio market as of 2026. Linden Air Duct San Antonio offers free estimates – call (430) 233-7681.
Written by Marcus Veale, Owner at Linden Air Duct San Antonio, serving San Antonio homeowners since 2004.
What Our Customers Say
"Good result and fair price. Had to reschedule once because of their truck trouble, but the new time was smooth and the tech knew the house already."
- Wayne G."Allergy season was brutal for my kid. After the cleaning there was a noticeable drop in sneezing at night. They also replaced a cracked flex duct in the attic."
- Omar D."We had construction dust packed into every register after a remodel. They sealed off the returns, used negative pressure, and left the floors cleaner than they found them."
- Paul E.