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AfterHow Much Does Duct Repair & Sealing Cost in Alpharetta?
Duct repair and sealing in Alpharetta typically costs between $450 and $1,850 for most homes, with an average project landing around $900 to $1,200. Minor leak sealing on accessible ducts runs $250 to $500, while full-system sealing with repair work in a two-story Alpharetta home often reaches $1,500 to $2,500. The range shifts based on how much of your ductwork sits in unconditioned attic or crawlspace areas, which is common in the Windward, Kimball Bridge, and Crabapple neighborhoods where homes built in the 1990s and 2000s are now showing their age.
This guide breaks down what you’ll actually pay in the Alpharetta market in 2026, what drives the price up or down, and how to avoid paying for work you don’t need. No vague “it depends” answers. Real numbers, real scenarios, and a clear picture of what happens on a repair visit from start to finish.
Key Takeaways
- Most Alpharetta duct repair and sealing jobs fall between $450 and $1,850
- Simple accessible duct sealing starts at $250 to $500
- Full-system sealing plus repairs in larger homes runs $1,500 to $2,500+
- Attic and crawlspace accessibility is the single biggest price driver in Alpharetta
- Written upfront pricing means you’ll know the exact cost before any work begins
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what Alpharetta homeowners can expect to pay, line by line. These ranges reflect what we’re seeing across Milton, Roswell, Johns Creek, and the broader North Fulton market as of early 2026. Prices assume a typical 2,000 to 3,500 square foot single-family home.
| Service Item | Typical Cost Range | What’s Included |
|---|---|---|
| Duct leak inspection & diagnostic | $75 – $150 | Visual inspection of accessible ducts, pressure testing where possible, and a written report of findings. Many companies, including ours, waive this fee when you proceed with repairs. |
| Minor leak sealing (1-3 accessible joints) | $250 – $500 | Mastic sealing or aluminum tape on accessible duct joints in the attic or basement. Includes cleanup and a photo of the finished work. |
| Moderate sealing (multiple leaks, partial system) | $500 – $900 | Sealing of up to half the duct runs, typically in the attic. Common in Alpharetta homes with original 1990s flex duct that has separated at the collars. |
| Full-system duct sealing | $900 – $1,500 | Sealing of all accessible duct joints, boots, and plenum connections. Recommended when diagnostic testing shows 15% or more leakage across the system. |
| Duct repair (sections, collapsed runs) | $350 – $850 per section | Replacement of crushed or kinked flex duct, repair of disconnected runs, reconnection of fallen boots. Price varies by run length and attic access difficulty. |
| Full-system sealing + repairs (larger homes) | $1,500 – $2,500+ | Combined sealing and repair work on homes 3,000+ sq ft or with ducts in hard-to-reach crawlspaces. Windward and Crooked Creek homes with multiple HVAC zones often land here. |
What Drives the Price Up or Down?
The biggest variable in Alpharetta isn’t the size of your house. It’s where your ducts actually live. Homes in neighborhoods like Foxworth, Mayfair, and Ellard that sit on crawlspaces have different access challenges than slab-foundation homes in Halcyon or downtown Alpharetta, where ductwork snakes through tight attics with low clearance and blown-in insulation. A technician who has to belly-crawl through a 24-inch attic opening to reach a leaking plenum connection is going to need more time, and more time means more labor.
Duct material matters too. Older Alpharetta homes, especially those built before 1990 in the historic district near Main Street, often have rigid metal ducts that are actually easier to seal than flex duct because the joints are mechanical and visible. Flex duct, common in 1990s and 2000s construction across North Fulton, fails more often at the inner liner level, which can mean replacing a section rather than just sealing it.
What Affects Duct Repair & Sealing Pricing in Alpharetta
- Attic accessibility and clearance. Alpharetta attics vary wildly. Some have plywood decking and standing room. Others, especially in townhome communities like Birmingham Crossing or Windward’s smaller floor plans, have attic openings barely wide enough for a shoulder-to-shoulder crawl. Tighter access means slower work, and slower work costs more.
- Number of HVAC zones. A single-zone system in a 1,800 square foot ranch has maybe 12 to 16 duct runs. A two-zone system in a 3,400 square foot Windward home could have 24 to 30 runs. More runs, more joints, more potential leaks, more time to seal properly.
- Age and condition of the existing ductwork. Homes built in Alpharetta’s big 1995 to 2008 growth wave are now hitting the point where flex duct inner liners are separating from the outer jacket. If we find that during the inspection, the fix isn’t a seal, it’s a section replacement. That’s an honest conversation about cost, and it’s one we have before any work starts, not after.
- Crawlspace vs. slab vs. attic duct layout. Crawlspace ducts in Crabapple and Saddle Creek homes are often easier to reach but prone to rodent damage and moisture issues that complicate sealing. Attic ducts are harder to access but usually cleaner. The layout determines how we quote the job.
- Whether the problem is one leak or systemic. A single disconnected boot behind the master bedroom wall is a $300 fix. A system losing 25% of its conditioned air through a dozen failed joints is a full-day job. The diagnostic inspection tells you which one you have.
- Time of year. In Alpharetta, HVAC companies are busiest in late spring and early fall when systems are transitioning between heating and cooling. Booking duct sealing in late winter or late summer can sometimes mean faster scheduling, though our written price stays the same regardless of the calendar.
One more thing worth naming plainly: some Alpharetta homeowners get quoted an hour-based rate instead of a project rate. Hourly duct work labor in this market runs $75 to $150 per hour. But we don’t work that way. You get a written project price before we start. If the job takes longer than expected, the price doesn’t change. That’s the point of a written quote.
How to Save on Duct Repair & Sealing
You don’t need to wait for a leak to get expensive to start paying attention to your ducts. Here’s what actually saves money in the Alpharetta market:
- Get the inspection done first, and don’t skip it. A $75 to $150 diagnostic tells you exactly what’s leaking and what isn’t. Guessing means paying for sealing you might not need, or missing a leak that’s been quietly driving up your GA Power bill in the Georgia summer for years.
- Repair early, not late. A separated duct joint that loses conditioned air into the attic is a problem that gets worse, not better. The air pressure in the system keeps widening the gap. A $300 fix in year one can become an $850 section replacement by year three.
- Combine duct sealing with a cleaning where it makes sense. If the ducts are being opened up and sealed anyway, it’s often the right time for a proper cleaning with professional equipment. That said, we’ll tell you honestly if a cleaning isn’t necessary. We don’t bundle services to inflate the bill.
- Check your insulation while you’re up there. Alpharetta attics lose an enormous amount of conditioned air through both leaking ducts and thin insulation. If your attic insulation is running shallow, sealing ducts is only solving half the problem. A conversation about both costs you nothing.
- Get a written quote and compare it properly. Two quotes at $1,200 can mean very different things. One might include three duct section replacements and full mastic sealing. Another might be for sealing alone. Compare the line items, not just the bottom number. And ask whether the diagnostic fee applies to the work.
We offer free estimates, and the quote you get is the price you pay. Call (762) 263-0408 and a live person will actually answer. Always. Not a voicemail, not a chatbot, not a call center queue. Every single visit starts with a written price before any work begins. That’s true on a $275 sealing job and it’s true on a $2,000 full-system repair.
Is Duct Repair & Sealing Worth It in Alpharetta?
Here’s the honest answer: it depends on what the inspection finds, but the numbers are worth knowing. The U.S. Department of Energy has long estimated that typical homes lose 20% to 30% of conditioned air through leaky ducts. In a North Georgia climate where you’re running air conditioning six to seven months out of the year, that’s not a small number. On a home spending $2,400 a year on heating and cooling, a 20% duct leak is roughly $480 a year in wasted energy, which means a $900 full-system sealing job can pay for itself in about two years before utility rates even rise.
But the bigger reason Alpharetta families call us about duct sealing is comfort. If you’ve got a second-story bedroom in a Windward home that’s always 5 degrees warmer than the rest of the house, that’s usually not a zoning problem. That’s usually a duct leak problem. You can keep turning down the thermostat and paying more, or you can fix the actual issue.
And for families with kids and pets, there’s another layer. Leaky ducts pull air from the attic and crawlspace into the living space. Not just unconditioned air. Attic dust, insulation fibers, and whatever’s living in the crawlspace. Sealing the ductwork keeps that out of the air your kids breathe. That’s not alarmism. That’s physics.
What to Expect on Repair Day
A duct repair and sealing visit with Morton’s Air Duct Cleaning isn’t a mystery, and it shouldn’t feel like one. Here’s how it goes at an Alpharetta home:
Our background-checked technicians arrive in uniform and bring shoe covers and drop cloths into the house before anything else. If you’ve got a dog, we’ll work around them. If there’s a toddler napping, we work quietly. That’s not a slogan. That’s the Cedarwell Care Promise, and it’s the standard on every single job, from a 30-minute sealing fix to a full-day repair.
We start with the inspection, if one hasn’t already been done, and we walk the findings with you before any work starts. You’ll see exactly what we’re seeing. Then you get the written price. If you approve it, we work. If you don’t, we pack up and head out. No pressure, no “while we’re here” upsells, no surprise line items at the end.
For the actual sealing and repair work, we use professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies. These aren’t entry-level rental tools. They’re the brands trusted by full-time duct professionals across the country, and they’re what allowed us to work efficiently in Alpharetta’s tight attics and crawlspaces for two decades now.
Before we leave, we take a photo of the finished work and the clean-up. You’ll see exactly what was done and how the space was left. Then the job is backed by our 365-Day Done Right Promise. If it’s not done right, Morton’s makes it right. Full stop. Not a warranty with fine print and exclusions. If you find an issue within a year of the work, you call us and we return to fix it. That’s part of being a member of the Cedarwell family of companies, and it’s how we’ve done things since Paul Adeyemi founded Morton’s in 2005.
DIY vs. Professional Duct Sealing
You can buy mastic and aluminum tape at any Home Depot in Alpharetta, including the big one on North Point Parkway, for under $50. And if you’ve got an easily accessible duct joint in an open basement or a garage-adjacent attic, you can absolutely seal it yourself with decent results. We’re not going to tell you otherwise.
But here’s what the DIY version misses. Most of the leaks in an Alpharetta home aren’t in the open, easy-to-reach spots. They’re in the hard-to-reach places: the plenum connection three feet into a cramped attic chase, the boot behind a wall cavity, the joint buried under blown-in insulation. Finding those requires knowing how to trace the system and test the airflow. Fixing them requires working in tight, hot, uncomfortable spaces where a missed seam means the leak comes right back.
And one honest safety note: if you’re working in an attic, especially in the summer months when Alpharetta attic temperatures climb past 130 degrees, the heat is genuinely dangerous. Heat exhaustion happens faster than most people expect. If you’re not used to working in those conditions, hire someone who is. The money you save doing it yourself isn’t worth a medical bill or worse.
Paul Adeyemi has been doing this work since 2005. He’s seen every duct configuration North Fulton has to offer, from 1970s metal systems in the historic district to brand-new flex runs in Halcyon. That experience means the diagnostic is fast, the quote is accurate, and the work is done right the first time.
How Much Does It Cost to Seal Ducts Yourself vs. Pro?
DIY materials: $50 to $150 for mastic, tape, and basic tools. Professional full-system sealing: $900 to $1,500 in the Alpharetta market. If you’ve got one visible leak you can reach without crawling through insulation, DIY is worth considering. If your system is losing air in places you can’t see, the professional route is cheaper in the long run, because a missed leak means paying for the same work twice.
Duct Repair & Sealing Costs in Nearby Cities
Pricing across North Fulton is fairly consistent, but there are local differences. Here’s what we see in neighboring markets:
- Roswell: Similar pricing to Alpharetta, with slightly lower attic-access difficulty in older brick ranch homes. Expect $450 to $1,700 for most jobs.
- Johns Creek: Larger homes on average, many with 3+ zones. Full-system sealing frequently lands in the $1,200 to $2,200 range.
- Milton: Larger lots and more crawlspace construction. Crawlspace duct repair runs slightly higher due to moisture and rodent considerations. $500 to $2,000 is typical.
- Cumming: Generally slightly lower labor costs than Alpharetta. Full sealing often runs $800 to $1,400.
- Norcross and Peachtree Corners: Older stock with more metal ductwork. Repairs trend toward the lower end, $400 to $1,200, because sealing is simpler on metal systems.
No matter the city, the pricing philosophy is the same: a written quote before work starts, a clean floor before we leave, and a one-year promise on everything we do.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in Alpharetta?
Duct sealing in Alpharetta costs between $250 and $1,500 depending on the scope of the job. Minor sealing on 1-3 accessible duct joints starts around $250 to $500, while a full-system seal on a typical single-family home runs $900 to $1,500. Homes over 3,000 square feet with multiple HVAC zones can exceed $2,000. Every quote at Morton’s is written and provided before any work begins, so the number you see is the number you pay. Call (762) 263-0408 for an exact quote on your home.
Is it cheaper to repair or replace ductwork?
Repairing and sealing existing ductwork is almost always cheaper than replacement, often dramatically so. In Alpharetta, duct repair and sealing runs $250 to $2,500, while a full duct replacement in a typical home runs $3,000 to $7,000 or more. Replacement only makes sense when ducts are extensively damaged, collapsed, or contaminated beyond cleaning. Most homes need repairs and sealing, not new ductwork. A diagnostic inspection tells you which path actually makes sense for your home.
How much does a duct leak cost on your energy bill in Alpharetta?
A typical duct system losing 20% to 30% of conditioned air can add $400 to $700 per year to a $2,000 to $2,400 annual heating and cooling bill in the Alpharetta climate. That means a $900 full-system sealing job often pays for itself within two years through energy savings alone, before accounting for the improved comfort in rooms that were previously hard to heat or cool.
Can duct sealing be done in one day?
Yes, most Alpharetta duct sealing jobs are completed in one day. Minor sealing takes 1 to 3 hours. Full-system sealing on a 3,000 square foot home typically takes 4 to 7 hours depending on attic access. Duct section replacements may add 1 to 2 hours per section. We provide a time estimate along with your written price, and the price doesn’t change if the job runs longer than expected.
Does homeowners insurance cover duct repair?
In most cases, homeowners insurance in Alpharetta does not cover duct repair or sealing because it’s considered normal wear and tear rather than sudden damage. Insurance may cover ductwork if it was damaged by a covered event like a fire, storm, or water damage from a burst pipe. If you’re unsure, your adjuster can clarify your specific policy. For everything else, duct repair is an out-of-pocket cost, which is one more reason the written upfront price matters.
How do I know if my ducts need sealing or just cleaning?
If you’ve got visible dust blowing from vents, that’s usually a cleaning issue. If you’ve got rooms that won’t hold temperature, unusually high energy bills, or airflow that feels weak in certain areas, that’s usually a leak issue that needs sealing. The two are sometimes related: a duct system with leaks will pull attic air and dust into the living space. A professional inspection can tell you which problem you actually have, and you should get that answer before you pay for either service.
Our Approach to Duct Repair & Sealing in Alpharetta
If you’ve been burned before by a service crew that left a mess, surprised you with a higher bill, or rushed through the work, you should know that’s the exact opposite of how Morton’s Air Duct Cleaning operates. We’re part of the Cedarwell family of independently owned companies, and the Cedarwell Care Promise applies to every single job, no exceptions. Shoe covers and drop cloths on every visit. A written price before any work starts. A photo of the clean-up before we leave. A live person on the phone at 3 a.m. if you’re calling about an emergency. And a 365-Day Done Right Promise on the work itself.
Paul Adeyemi started this company in 2005, and the standard hasn’t slipped since. Our technicians are background-checked, uniformed, and trained to work in homes with kids and pets. That means quieter tools during nap hours, pet-safe product choices where available, and a level of care that you’ll notice in the details: the drop cloths placed before the attic ladder comes down, the floor protected from the moment we walk in, the finished-work photo texted before we leave.
If you’re in Alpharetta, Milton, Roswell, Johns Creek, or anywhere else in North Fulton, and you’ve got leaking ducts, uncomfortable rooms, or an energy bill that’s higher than it should be, start with a conversation. Not a sales pitch. Tell us what you’re noticing. We’ll tell you what we think it is, what it might cost, and whether an inspection makes sense. Then we’ll show up, show you the written price, and do the work the way it should be done.
If you haven’t had your ducts looked at yet, start with our home page to see the full range of what we do, or go straight to our Duct Repair & Sealing in Alpharetta page for more detail on the service itself. When you’re ready for a real number on your home, call us.
Call (762) 263-0408 for a free estimate. A live person answers. You’ll have a written price before any work starts. That’s the only way we do business.
Written by Paul Adeyemi, Owner at Morton’s Air Duct Cleaning, serving Alpharetta and North Fulton since 2005.
Pricing reflects the Alpharetta market as of 2026. Mortons Air Duct Alpharetta offers free estimates – call (762) 263-0408.
What Our Customers Say
"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"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 cats the vents were full of hair. The crew was kind and patient with the pets, kept the doors closed, and vacuumed up before they left. Really considerate."
- Lacey Burkhart