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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 $1,100, with most homes falling in the $400 to $750 range depending on how many leaks need attention and how accessible your ductwork is. A straightforward sealing job on a single accessible section runs $285 to $450, while whole-system duct repair with multiple leaks, disconnected joints, and hard-to-reach attic runs can push toward $1,100 or more. Call (903) 354-8393 and we’ll give you a written price before any work starts, so you know the number before you commit.
This guide breaks down exactly what drives duct sealing costs in San Antonio in 2026, what you should expect to pay for common repairs, and how to avoid paying for work you don’t need. Whether you’re in Alamo Heights, Stone Oak, Helotes, or down near Lackland, the numbers below reflect what we see across the San Antonio market every week.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s the pricing table we use when we walk a San Antonio home. These ranges reflect what Morton’s Air Duct Cleaning has charged across the city in 2026, from single-story homes in Converse to sprawling two-story houses in Dominion. Every job gets a written quote first, so there’s no guessing on invoice day.
| Service | Typical San Antonio Price Range | What It Includes |
|---|---|---|
| Single leak sealing (accessible duct) | $285 – $450 | One visible leak or disconnected joint, sealed with mastic or foil tape, no drywall work needed |
| Whole-system duct sealing (average home) | $550 – $900 | Full inspection, seal all accessible leaks, reconnect loose joints, test airflow before and after |
| Duct repair with insulation replacement | $400 – $850 | Patching damaged duct runs plus replacing torn or compressed insulation wrap |
| Disconnected duct reattachment | $150 – $350 | Reconnecting a duct that pulled away from a boot or plenum, resealing the joint |
| Damaged flex duct replacement (per section) | $85 – $180 | Removing crushed or torn flex duct and installing new section, sealed at both ends |
| Attic plenum repair | $300 – $650 | Repairing the main supply or return plenum where multiple ducts connect |
| Whole-system duct replacement | $2,800 – $5,500+ | Full tear-out and replacement of all ductwork, typically older homes with failing systems |
What Drives Cost Up or Down
The biggest variable in San Antonio is access. Ductwork in a crawl space or a tight attic adds labor time, and labor is the largest single cost component. Homes in older San Antonio neighborhoods like Monte Vista, Tobin Hill, and Alta Vista often have tight attic clearances and decades-old metal ductwork that’s harder to work with than modern flex runs in newer subdivisions like Stillwater Ranch. The condition of your insulation matters too. If the R-value has degraded from San Antonio’s heat and humidity cycles, you may need insulation replacement alongside the sealing work, which adds $100 to $300 depending on how much is damaged.
Number of leaks also moves the needle. A single disconnected boot might take 45 minutes. A system where a dozen joints are failing throughout the attic takes the better part of a day. We find more leaks in homes where the original builder used short flex runs with minimal slack, which is common in fast-built subdivisions across the northwest side from Leon Valley to Culebra Park. Short runs pull apart at the seams as the house settles.
What Affects Duct Repair & Sealing Pricing in San Antonio
- Attic or crawl space accessibility. San Antonio’s older bungalow stock in neighborhoods like Jefferson and Beacon Hill often has cramped, low-clearance attics. That means slower work and higher labor costs than a wide-open attic in a newer Bandera Road subdivision. Standing clearance, flooring, and distance between duct runs all affect how long the job takes.
- Number of leaks and disconnected joints. Many San Antonio homes have never had ductwork touched since original construction. Over time, the thermal cycling from our 100-degree summers and cooler winter snaps causes connections to loosen. More leaks means more time, more mastic, and more cost. We find the average home needs 5 to 12 leak repairs when we do a full system inspection.
- Duct material and age. Galvanized steel ducts from homes built before the 1990s require different sealing techniques than modern flex duct. They’re generally more expensive to repair per leak but less likely to need full replacement. Flex duct that’s been baked in a Texas attic for 15 years may be too brittle to patch and needs section replacement instead.
- Insulation condition. San Antonio humidity and heat breaks down duct insulation faster than most markets. Where the wrap has compressed or torn, we replace it during the sealing job. This prevents condensation issues later and keeps sealed ducts from sweating in our summer humidity, but it adds cost per linear foot.
- Presence of mold or pests. If we find mold inside ducts or evidence of rodents nesting in the insulation, that changes the scope. Mold remediation is a separate service from sealing, and pest damage often means replacing rather than repairing sections. We flag these findings during inspection and give you a separate written quote before any additional work happens.
- Whether the system needs a pressure test. Some homeowners want a before-and-after duct leakage test using a duct blaster to quantify how much air was escaping. This adds $150 to $250 but gives you hard numbers, which is useful if you’re trying to justify the work against high utility bills.
Is Duct Repair & Sealing Worth It in San Antonio?
Yes, and the math is straightforward. Leaky ductwork wastes 20% to 40% of the air your HVAC system produces, according to the U.S. Department of Energy. In San Antonio, where your AC runs hard from April through October, that’s money leaking into your attic every single month. If your summer electricity bill runs $350 and 30% of your conditioned air is escaping into the attic, you’re paying roughly $100 a month to cool your insulation. A $650 sealing job pays for itself inside of one cooling season in most San Antonio homes.
Beyond the bill, there’s comfort. Rooms at the far end of a leaky duct run in a two-story house, which is very common in neighborhoods like Stone Oak and Encino Park, often can’t hold temperature. Sealing the system restores balanced airflow so the master bedroom isn’t 10 degrees warmer than the living room. For families with kids and pets, that matters during San Antonio’s summer heat waves.
Duct Repair vs. Duct Replacement in San Antonio: When Each Makes Sense
Repair and sealing makes sense when the ductwork is fundamentally sound but leaking at the seams. Most San Antonio homes built in the last 25 years fall into this category. The flex duct and boots are intact, but the connections have loosened over time and the original sealing material, often cheap tape rather than mastic, has failed.
Full replacement makes sense when the ductwork itself is deteriorating. We see this in San Antonio homes where the ducts have been in place since the 1980s or early 1990s, the insulation is flaking, or rodents have chewed through multiple sections. If more than a third of the system is damaged, replacement is usually the better financial call. A full replacement on an average San Antonio home runs $2,800 to $5,500 depending on system size and attic conditions. We’ll tell you straight if repair is throwing money at a dying system. Our Duct Repair & Sealing in San Antonio page has more detail on what a full inspection looks like.
Signs You Need Duct Repair or Sealing
- Rooms that won’t hold temperature no matter where you set the thermostat
- Dust accumulating quickly on furniture and floors even with regular cleaning
- Heating or cooling bills that creep up year over year without a change in usage
- Weak airflow from vents, especially in rooms farthest from the HVAC unit
- A musty or stale smell when the system kicks on
- Visible disconnected or crushed flex duct in your attic
If any of these sound familiar, call us at (903) 354-8393. We’ll schedule an inspection, walk your attic with you if you’d like, and explain exactly what we found and what it costs to fix. You decide what happens next.
How Morton’s Air Duct Cleaning Prices Duct Sealing Work
We quote duct repair and sealing by the job, not by the hour. What that means for you is that the number we put in writing is the number you pay. If the work takes longer than expected because your attic turns out to be tighter than we thought or we find an extra leak, that’s our problem, not an add-on on your invoice. We’ve worked this way since Paul Adeyemi founded Morton’s Air Duct Cleaning in 2005, and we’ve never changed it.
Every visit starts with an inspection of your ductwork, your attic or crawl space, and your HVAC connections. We’ll show you what we find, explain what needs fixing and what can wait, and then hand you a written price. No pressure, no phone call to a manager for “special pricing,” no surprise line items. The quote covers the full scope. If you approve it, we get to work. If you don’t, we leave and you owe nothing.
Our technicians carry professional equipment from Rotobrush, Nikro, and Abatement Technologies, not entry-level rental gear. Rotobrush systems let us clean and seal duct interiors thoroughly, while Nikro and Abatement Technologies equipment handles more demanding jobs like duct inspection cameras and negative air pressure containment when needed. For air purification add-ons, we install products from Honeywell, Aprilaire, and Guardsman, all of which we can quote as part of a duct sealing project or as a separate service.
And when we’re in your home, shoe covers go on at the door, drop cloths protect your floors around every work area, and we keep tools running quiet if there’s a toddler napping down the hall. Our technicians respect your house the way they’d respect their own because the Cedarwell Care Promise says they have to. Before we leave, we’ll show you a photo of the cleanup, which is part of every job we complete.
How to Save on Duct Repair & Sealing in San Antonio
Smart homeowners approach duct sealing like preventive maintenance rather than emergency repair. Here’s how to keep your total bill down.
- Bundle sealing with cleaning. If you’re already having your ducts cleaned, sealing while the system is opened up is more efficient than scheduling two separate visits. The cleaning exposes leaks you can’t see when dust and debris are caked inside. Morton’s Air Duct Cleaning handles both services, and we’ll quote the combined job at a better price than doing them separately.
- Fix small leaks early. A $300 single leak repair today prevents that joint from completely separating and pulling a whole duct run down with it. We see this constantly in San Antonio attics where one connection fails and the added weight strains the next one in line.
- Don’t wait until August. HVAC companies and duct specialists are busiest during peak cooling season. Scheduling your inspection and sealing work in the spring or fall, when the San Antonio weather is mild and our schedule is more flexible, can mean a faster appointment and occasionally lower seasonal pricing.
- Ask about energy efficiency rebates. CPS Energy has offered rebate programs for duct sealing and insulation improvements in the past, and eligibility changes annually. We can’t promise a rebate, but we’ll point you toward current CPS Energy program information if your work might qualify.
- Prioritize the worst leaks. If a full-system sealing isn’t in the budget right now, we can identify the largest leaks, which typically account for most of your airflow loss, and seal those first. You’ll get the biggest efficiency gain for the smallest immediate investment, and you can complete the rest later.
- Get a second quote if you want one, but compare scope, not just price. Some San Antonio companies quote low by including only basic mastic application and skipping insulation repair or boot sealing. Our quotes always list exactly what’s included, so when you compare numbers, you’re comparing the same work. Call (903) 354-8393 for a free estimate that spells it all out.
Why San Antonio Ductwork Leaks More Than Other Markets
San Antonio’s climate is unusually hard on duct sealing materials. Our summer attics routinely hit 130 to 150 degrees, which bakes adhesives and dries out tape. Then winter nights drop into the 30s and 40s, causing contraction. That thermal cycling, repeated every year, is exactly what breaks down the cheap foil tape many builders used in the 2000s. It’s also why our technicians use mastic sealant, which stays flexible through temperature swings, rather than tape alone on every duct repair we do in San Antonio.
Humidity compounds the problem. When ducts leak cool air into a humid attic, condensation forms on the outside of the ductwork. Over time, that moisture soaks into the insulation wrap and reduces its effectiveness. In severe cases, it drips onto attic flooring or drywall, and we get called for a stain on the ceiling that turns out to be a duct leak above it. That’s common in single-story San Antonio homes with ductwork running through unconditioned attics.
The freeze events San Antonio has experienced in recent years, particularly the February freezes and the 2022 and 2024 cold snaps, also stressed older metal ductwork. Metal contracts more dramatically than plastic or flex material, and joints that held for decades can pop loose in one hard freeze. If your home was built before 2000 and your ducts have never been sealed, a freeze event is often the trigger that finally exposes the problem.
What a Duct Sealing Job Looks Like at Your San Antonio Home
Here’s the sequence, step by step, so you know exactly what to expect when we arrive. It’s the same process we’ve used for thousands of San Antonio homes, and the same process Paul Adeyemi established when he started the company.
Step 1: Inspection and Scope
We arrive in uniform, slip on shoe covers at the door, and do a full walkthrough of your HVAC system and ductwork. In most San Antonio homes, that means going into the attic. We’ll bring a camera to show you what we see, whether it’s a disconnected boot, a crushed flex run, or mastic that’s cracked and flaking. We’ll also check your returns, your supply registers, and your plenum connections. The inspection typically takes 30 to 60 minutes.
Step 2: Written Quote
Before any work starts, you get a written price for the full scope. No verbal estimate, no “rough range” that becomes a higher number later. The quote lists what we’ll seal, what we’ll repair, what insulation we’ll replace if needed, and the total cost. You can say yes, no, or ask us to adjust the scope. There’s no charge for the estimate and no obligation.
Step 3: Sealing and Repair
Our technicians seal connections using professional-grade mastic applied by hand or brush, which forms a durable, flexible seal that holds through San Antonio’s temperature swings. We reconnect loose boots, replace damaged flex sections, patch holes in metal duct with sheet metal and sealant, and wrap repaired areas with new insulation where needed. Drop cloths go down in every workspace, and we work around your family’s schedule if you have kids napping or pets that need space.
Step 4: Verification and Cleanup
We test airflow at registers before and after the work to confirm the system is moving air as it should. Then we clean up, vacuum any debris, remove our materials, and walk the home with you. Before our crew leaves, they take a photo of the finished work and the cleaned areas. That’s the Cedarwell Care Promise in practice, and it’s been standard at Morton’s since 2005.
What Morton’s Air Duct Cleaning Does Differently in San Antonio
If you’ve been burned by a service crew before, in San Antonio or anywhere else, you know the patterns: the estimate that grows, the mess left behind, the rushed work that fails within a year. We built Morton’s Air Duct Cleaning specifically to be the opposite of that experience. Our home page lays out the full picture, but here’s the short version.
We’re an independently owned and operated member of the Cedarwell family of companies, and we hold ourselves to the Cedarwell Care Promise on every single job. That means shoe covers and drop cloths on every visit, every time. It means a written price before any work starts, no exceptions. It means a photo of the cleanup before the crew leaves. And it means our 365-Day Done Right Promise backs every job: if it’s not done right, we make it right, full stop, within a year of the work.
We don’t pressure. We don’t scare. We don’t use limited-time offers to force a decision. We show you the problem, quote you an honest price, and let you decide. That’s how we’ve operated in San Antonio for over 19 years, and it’s why families with kids and pets keep calling us back.
FAQs – Duct Repair & Sealing Cost in San Antonio
How much does it cost to seal ductwork in San Antonio?
Duct sealing in San Antonio typically costs between $285 and $900 depending on the number of leaks and the accessibility of your ductwork. A single accessible leak runs $285 to $450, while whole-system sealing on an average San Antonio home runs $550 to $900. Every Morton’s job includes a written quote before work starts, so call (903) 354-8393 for an exact number on your home.
Is it cheaper to repair or replace ductwork in San Antonio?
Repair is cheaper when the ductwork is structurally sound and only the connections are leaking. Most San Antonio homes fall into this category, with repair costs between $400 and $900. Replacement only makes sense when the ducts themselves are failing, which runs $2,800 to $5,500 or more. We’ll tell you honestly which path makes sense for your home, and we never recommend replacement when repair will do the job.
How much does a duct leakage test cost in San Antonio?
A duct blaster leakage test in San Antonio typically costs $150 to $250 as part of a broader inspection. The test measures exactly how much air your duct system is losing, which gives you a baseline number before sealing work and a comparison number afterward. If you want hard data to justify the cost, it’s worth the add-on. Call (903) 354-8393 and we can include it in your inspection quote.
Can you seal ducts without replacing drywall in San Antonio?
Yes, in most San Antonio homes. The majority of duct sealing work happens in the attic or crawl space, where the ductwork is exposed and accessible. Drywall work is only needed when ducts run through enclosed chases, which is less common in San Antonio construction than in northern climates. If we do need to access a sealed chase, we’ll tell you during inspection and quote any drywall repair separately before work begins.
How long does duct sealing take in San Antonio?
Most whole-system duct sealing jobs in San Antonio take 4 to 8 hours, including inspection, sealing, and cleanup. Single leak repairs usually take 45 to 90 minutes. Homes with difficult attic access or extensive leak counts can take a full day. We’ll give you a time estimate with your written quote so you can plan around nap schedules, work calls, or whatever else your day holds.
Will duct sealing lower my energy bill in San Antonio?
Yes, most San Antonio homeowners see a 10% to 30% reduction in cooling and heating costs after duct sealing. The exact savings depend on how much air your system was losing and how efficiently it operates after the work. With San Antonio’s long cooling season, even a 15% reduction on a $300 summer electric bill saves about $45 a month during peak months. The work typically pays for itself within one to two years.
Get a Free Duct Repair & Sealing Estimate in San Antonio
If your rooms are uncomfortable, your bills are creeping up, or you suspect your ducts have been leaking for years, call Morton’s Air Duct Cleaning at (903) 354-8393. We’ll schedule an inspection at a time that works for your family, show you exactly what we find, and hand you a written price before any work begins. A live person answers the phone 24/7, so you won’t reach a voicemail or a robotic menu. You’ll reach a human being who can schedule your visit.
Pricing reflects the San Antonio market as of 2026. Mortons Air Duct San Antonio offers free estimates, call (903) 354-8393.
Written by Paul Adeyemi, Owner at Morton’s Air Duct Cleaning, serving San Antonio since 2005.
What Our Customers Say
"Friendly, calm crew that clearly cared about the house. Covered their shoes, protected the floors, and double checked they'd closed up every vent cover properly. Would have them back."
- Omar Zaid"New house, old dusty ducts. They were gentle in the house, laid down drop cloths, and double checked every register was sealed back up. Air smells fresh now."
- Scott Hemmings"With two kids and a dog the vents were overdue. The crew put down runners through the whole house and wore booties. Not a speck of dust left behind, and the air smells fresh."
- Paula Esposito