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 Marietta?
Most Marietta homeowners pay between $450 and $1,850 for duct repair and sealing, with the typical job landing around $900 to $1,300. Small, localized fixes like sealing a single accessible joint or patching a short flex-duct run can run as low as $175 to $350, while whole-home duct sealing with Aeroseal or extensive replacement of deteriorated trunk lines in crawl spaces can push past $2,800. Your exact price depends on how much of your ductwork is accessible, how many leaks are present, and whether you’re dealing with sheet metal, flex duct, or fiberboard.
At Kestrel Air Duct Marietta, you’ll know your exact number before a single vent is touched. Written price first, always. That’s the Kingswell Guarantee, and it’s been the same since 2004.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what we’re seeing across Cobb County and metro Atlanta in 2026. These are real ranges from actual Marietta jobs, not national averages pulled from a spreadsheet.
| Service | Typical Cost Range | What It Includes |
|---|---|---|
| Single joint or seam sealing | $175 – $350 | Accessible duct joint, mastic sealant, foil tape, one-hour visit |
| Small flex duct repair (one run) | $200 – $450 | Replace a crushed or torn flex section up to 10 feet |
| Multiple leak sealing (5 – 10 leaks) | $500 – $1,100 | Mastic sealing at accessible plenum, branch, and boot connections |
| Whole-home duct sealing | $900 – $1,850 | Comprehensive sealing of accessible ductwork, average 1,800 – 2,600 sq ft home |
| Aeroseal aerosol sealing | $1,800 – $3,200 | Seals leaks from the inside, reaches ducts behind walls and in chases |
| Duct section replacement (per 10-ft run) | $350 – $750 | Remove and replace damaged flex or rigid duct, reconnect and seal |
| Crawl space duct repair (moderate) | $600 – $1,600 | Accessing low-clearance areas, repairing rodent damage or sagging trunk lines |
| Full duct re-seal plus insulation wrap | $1,500 – $2,800 | Seal all accessible leaks, re-wrap with R-6 or R-8 insulation where needed |
These numbers assume typical Marietta construction: ranch homes and two-story colonials built between 1960 and 2010, with ductwork running through attics and crawl spaces. Homes in East Cobb with finished basements tend to run higher because more ductwork is enclosed behind drywall, which means more time to access and test. Older homes near Marietta Square with original 1950s sheet metal ductwork often need more sealing work simply because of age and joint deterioration.
What makes the price move up or down
Access is the single biggest variable. Ductwork in an open attic or unfinished basement is fast to reach. Ductwork behind finished walls or above a vaulted ceiling means more labor, more testing, and sometimes drywall cuts. Leak count matters too. A duct system with two leaks is a quick job. One with 25 pinprick-sized leaks across every boot and collar takes a full day to properly seal, even though each individual fix is simple.
Duct type changes the math as well. Flex duct tears and crushes easily, but it’s cheap to replace. Rigid sheet metal lasts decades, but when joints fail, resealing them properly takes mastic, mesh tape, and patience. Fiberboard ducts, common in some 1970s and 1980s Cobb County homes, are the trickiest: they absorb moisture and can harbor mold, which sometimes means section replacement rather than repair.
What Affects Duct Repair & Sealing Pricing in Marietta
Here’s what moves your final number, specific to how homes are built in this part of Georgia:
- Crawl space vs. attic vs. basement access. Marietta homes built before 1980 often have crawl spaces with low clearance, sometimes only 18 to 24 inches. Technicians work on their backs to reach duct runs, which adds labor hours. Attic ductwork in newer subdivisions like those off Barrett Parkway is faster to reach, assuming there’s walking room and not blown insulation covering everything.
- Humidity and seasonal damage. Marietta’s summer humidity sits above 70% for weeks at a time. Fiberboard ducts and uninsulated sheet metal sweat in attics that hit 140°F. That condensation loosens tape joints and accelerates rust at connections. We regularly see seams that failed because of years of humid attic conditions, not because of poor installation.
- Rodent and pest intrusion. Rats, mice, and squirrels are a constant pressure in neighborhoods near Kennesaw Mountain and along the Chattahoochee. A single chewed flex run can turn into four or five damaged sections once you trace the full path. Repairing pest damage often also requires sealing entry points so the problem doesn’t repeat in March when spring nesting starts.
- Number and location of leaks. Homes that have never had duct sealing typically have 10 to 30 leaks. The plenum-to-trunk connections, branch takeoffs, and register boots are the usual suspects. Each leak is small, but fixing all of them properly means a full day rather than a two-hour patch job.
- Age of the ductwork. Ducts installed in the 1970s are now past their expected service life. Flex duct has a useful life of 15 to 20 years in Georgia’s heat. If your system is approaching or past that age, sealing may be a temporary fix, and partial replacement becomes the more honest recommendation.
- Testing and verification. A duct blaster test before and after sealing costs $150 to $300 in the Marietta market. It’s the only way to quantify leakage in CFM (cubic feet per minute) and confirm the sealing actually worked. Some companies skip it. We recommend it for whole-home jobs because you should see the number before and after.
Duct Repair & Sealing in Marietta: Is It Worth the Cost?
The short answer is yes, and the math is straightforward. The U.S. Department of Energy has estimated for years that typical duct systems lose 20% to 30% of conditioned air through leaks before it ever reaches a register. In a Marietta summer, when your AC runs 10 to 14 hours a day, that’s real money. If your cooling bill averages $180 a month from May through September, a 25% duct loss means roughly $180 in waste over a single summer. Seal the ducts properly and that savings repeats every year.
There’s also the comfort angle. Rooms at the end of long duct runs, often upstairs bedrooms in two-story Marietta colonials, run 5 to 8 degrees warmer than the thermostat setting when ducts leak along the way. Sealing the trunk line and branch connections often evens out those temperatures within a day of the work being done.
And then there’s air quality. Leaky return ducts in an attic or crawl space pull in whatever’s around them: insulation fibers, dust, rodent droppings, humidity. If you’ve noticed a musty smell when the AC kicks on, or more dust settling on furniture than seems normal, leaky return ducts are frequently the cause. Sealing them stops that pathway. Our Duct Repair & Sealing in Marietta page walks through the full scope of the service if you want more detail.
Duct Repair vs. Replacement: How to Decide in Marietta
This is the most common question we hear from homeowners, and the answer turns on three things: the age of your ducts, the extent of damage, and the condition of the duct material itself.
If your flex duct is 15 years old or less and the damage is localized, repair and sealing almost always makes more sense. A $400 repair on an otherwise sound system is a better use of money than a $4,000 full replacement. But if the inner liner of flex duct has deteriorated, if there’s visible mold on fiberboard, or if you have multiple disconnects from shifting and poor original installation, replacement needs to be part of the conversation.
For sheet metal ducts, replacement is rare. Metal ducts last 50 years or more if they stay dry. The problems are almost always at the joints, and those can be sealed. We’ve worked on 1960s-era metal ductwork in homes near Marietta Square that sealed up tight and tested at under 5% leakage afterward.
What’s Actually Included in Duct Sealing?
When you hire a duct sealing contractor, here’s what a quality job includes in 2026:
- Inspection and leak testing. We find the leaks before we fix them. That means visually inspecting every accessible section, plus a duct blaster test on whole-home jobs to measure total leakage in CFM.
- Mechanical cleaning of connections. Sealant doesn’t stick to dust. Joints and seams get wiped or brushed clean before mastic is applied.
- Mastic application at every accessible joint. Mastic is a thick, paste-like sealant that dries to a durable, flexible seal. It’s the industry standard, far better than foil tape alone, which degrades in attic heat within a few years.
- Reconnection of disconnected sections. In Marietta crawl spaces, it’s common to find flex duct that has pulled away from a boot or trunk collar entirely. That’s a full disconnect, not a leak, and it means the air you paid to condition is blowing into the crawl space. Reconnection plus mastic and zip ties is the fix.
- Boot sealing at the register. Where ducts meet the floor or ceiling register, gaps let conditioned air escape into wall cavities. Sealing these with mastic from below or foam from above is part of a complete job.
- Post-sealing verification. A second duct blaster test to show the before and after numbers. If leakage went from 28% to 6%, you should see that documented.
Note that none of this involves the kind of “duct tape” you can buy at a hardware store. Real duct sealing uses mastic and mesh tape rated for HVAC temperatures. That stuff in the gray roll isn’t approved for ductwork anywhere in Georgia, and it fails quickly in an attic that hits 140°F in July.
How to Save on Duct Repair & Sealing
There are a few legitimate ways to keep your duct repair cost in Marietta down without cutting corners on the work itself:
- Address leaks when you notice them, not a year later. A single disconnected flex run gets worse, and the air it leaks pulls dust and humidity into the system. Early repair is cheaper than waiting until three more runs disconnect.
- Combine sealing with your next duct cleaning. If you’re already scheduling duct cleaning, having us inspect and seal while the system is opened up can save a trip charge. Our home page explains our approach to both services.
- Focus on the supply side first if budget is tight. Supply leaks cost you cooled air in summer and heated air in winter. Return leaks pull attic or crawl space air into your home. Supply leaks have a bigger immediate effect on your energy bill, so prioritizing those gets the fastest payback.
- Ask about a duct blaster test only where it counts. For single leaks or obvious disconnects, you don’t always need a $200 test. For whole-home sealing, it’s worth the money because it verifies the result. A good contractor will tell you when the test is necessary and when it isn’t.
- Get your written price before agreeing. This sounds obvious, but in the Marietta market, we’ve heard too many stories of quotes that grew at the door. The Kingswell Way is simple: the written price is in your hands before work begins. If a contractor won’t commit to a number in writing, that’s a signal to call someone else.
Estimates are free at Kestrel Air Duct Marietta. Call (762) 533-6494 and we’ll schedule a time to look at your ductwork and give you a firm, written number.
FAQs – Duct Repair & Sealing Cost
How much does it cost to seal ductwork in Marietta?
Whole-home duct sealing in Marietta typically costs between $900 and $1,850 for an average 1,800 to 2,600 square foot home. Smaller jobs sealing a handful of accessible joints run $175 to $450, while Aeroseal whole-home aerosol sealing starts around $1,800. Call (762) 533-6494 for a free, written estimate specific to your house.
Is duct sealing worth the money?
Yes, when the ducts actually leak. A typical Marietta home with 20% to 30% duct leakage wastes hundreds of dollars per cooling season, and sealing usually pays for itself within 2 to 5 years depending on your energy usage and home size. The key is verifying leakage with a duct blaster test before and after, so you know the work actually worked.
Can you fix ductwork the same day?
In most cases, yes. Small repairs like resealing a disconnected flex run or patching an accessible joint are same-day jobs. Whole-home sealing on a larger Marietta home is generally a one-day job, though homes with extensive crawl space access issues or pest damage may take a second day. Kestrel answers calls with a live person 24/7, so call (762) 533-6494 any time to talk through your situation.
How much does it cost to replace ductwork in Marietta?
Full ductwork replacement for a typical Marietta home runs $4,000 to $8,000 depending on home size, access conditions, and duct type. Replacing a single damaged flex run costs $350 to $750. If your ducts are older than 15 to 20 years and heavily deteriorated, replacement may be the better long-term choice, but most systems respond well to targeted repair and sealing.
Does duct sealing help with high energy bills in Georgia?
Yes. Sealing a leaky duct system that was losing 25% of conditioned air can reduce your HVAC energy use meaningfully in Marietta’s hot, humid climate, where AC runs heavily from May through September. The exact savings vary by home, but the Department of Energy has documented average duct leakage in U.S. homes at 20% to 30%, and sealing captures most of that loss.
What is the 365-Day Done Right Promise?
It’s the written guarantee that comes with every Kestrel Air Duct job. If the repair or sealing work we perform fails within 365 days, we return and make it right at no charge. It’s not a verbal promise or a courtesy. It’s in writing, on every single job, and it’s been the standard since Dale Whitmore started the company under the Kingswell Guarantee in 2004.
Why Marietta Homeowners Choose Kestrel Air Duct Marietta
Duct repair and sealing is one of those services where the difference between a good job and a bad one is invisible unless you know what to look for. A bad sealing job looks fine from the outside. The mastic is there. The joints look covered. But a year later, the tape is peeling in the attic heat, the leak is back, and nobody’s answering the phone.
We built Kestrel Air Duct Marietta to be the accountable option. Our technicians are background-checked and uniformed. They work with Rotobrush rotary brush systems to dislodge debris at the duct wall, Nikro negative-pressure units to pull contaminants out, and Abatement Technologies HEPA filtration to keep loosened particles out of your living space. Those are professional-grade tools, not box-store shop vacs. And for homeowners who want to maintain cleaner air between visits, we offer Honeywell, Aprilaire, and Guardsman filtration products.
Dale Whitmore has led this team under the Kingswell Way since 2004. The code is simple: say the price, show up in the window we gave, leave the place cleaner, put the guarantee in writing, and come back if it fails. If the repair doesn’t hold within 365 days, the return visit is free. In writing. Not a discretionary courtesy.
And when you call, a real person answers. Any hour, any day. Not a voicemail queue, not an automated attendant. A conversation with someone who can actually help.
Get Your Written Duct Repair Estimate in Marietta
If you suspect leaky ducts, high energy bills, rooms that never cool properly, or you’ve seen disconnected flex in your crawl space, the next step is simple. Call (762) 533-6494 and describe what you’re seeing. We’ll schedule a visit, inspect your ductwork, and put a written price in your hands before any work begins. No surprises at the door. No vague estimates. Just a number you can plan around, backed by a 365-Day Done Right Promise in writing.
Pricing reflects the Marietta market as of 2026. Kestrel Air Duct Marietta offers free estimates – call (762) 533-6494.
Written by Dale Whitmore, Owner at Kestrel Air Duct Marietta, serving Marietta and the surrounding metro Atlanta area since 2004.
What Our Customers Say
"Booked them because our old HVAC guy mentioned the ducts were filthy. Quote on the phone matched the invoice to the dollar. Polite crew, laid down mats, in and out in about two hours."
- Hannah Kim"My wife's allergies were awful every morning. Had the ducts done and it's made a real difference. Tech was on time and wore booties in the house without me asking."
- Rob Pendergast"Our dryer was taking two cycles to dry a load. They cleaned the vent and pulled out a frightening amount of lint. Dries in one cycle now and honestly I feel better about the fire risk."
- Marcus Lee