Duct Repair & Sealing Cost - Tested First, Written Price Second

How Much Does Duct Repair & Sealing Cost in Marietta?

Duct repair and sealing in Marietta, GA typically costs between $285 and $1,900, with most homeowners paying $450 to $950 for common repairs like sealing accessible duct runs, patching minor leaks, or replacing a short section of damaged flex duct. A full-system seal using aerosolized duct sealant runs higher, usually $1,800 to $3,500 depending on square footage, while simple jobs like resealing a single supply boot can fall under $300. That’s the honest range we quote at Linden Air Duct Marietta, and it’s based on what we actually see in Cobb County homes, from Powder Springs Street bungalows to subdivisions off Barrett Parkway.

The real variable isn’t the material cost. It’s access. Ducts in a crawlspace off the Eastern Continental Divide’s clay-heavy soil, or in an attic that hits 140°F in July, take longer to reach and seal properly than ducts in a finished basement. We’ll get into exactly what moves the number later on this page. First, the breakdown.

Key Takeaways:

• Typical duct repair and sealing in Marietta: $450 – $950 for most jobs
• Minor repairs (resealing one boot, small patch): $175 – $350
• Full-system aerosol sealing: $1,800 – $3,500
• Access difficulty is the biggest cost driver in Marietta’s older homes
• Written estimates are free – call (912) 405-8840 and you’ll know your exact price before any work begins

Duct Repair & Sealing Cost Breakdown (2026)

Here’s what we quote for duct repair and sealing across Marietta, based on 2026 pricing for the Cobb County market. These are real ranges we use when writing estimates, not national averages pulled from a database. Labor rates reflect what skilled HVAC and duct technicians charge in the metro Atlanta area, and material costs reflect supplier pricing in the region.

Repair / Sealing Job	Typical Price Range (Marietta, 2026)	What It Covers
Reseal one supply or return boot	$175 – $350	Removing the old tape or mastic, cleaning the connection, applying mastic and foil-backed tape, retesting with a smoke pencil
Patch a small hole or tear in flex duct (up to 12 inches)	$225 – $425	Cutting out the damaged section, installing a metal or rigid coupling, sealing both sides
Replace a short flex duct run (up to 10 feet)	$350 – $700	New R-6 or R-8 flex duct, two connectors, mastic sealing at both ends, support strapping
Seal accessible metal duct joints (per 10 joints)	$300 – $550	Mechanical cleaning of each joint, fiberglass mesh tape where needed, mastic application, inspection
Repair a crushed or collapsed duct section	$450 – $900	Accessing the damaged section, removing and replacing it, resealing, checking static pressure after
Reseal the plenum connection at the air handler	$350 – $650	Removing old sealant, reinstalling with mastic or gasket material, verifying no air bypass at the equipment cabinet
Full-system duct sealing (aerosolized, whole-house)	$1,800 – $3,500	Sealing all accessible ductwork from the inside using aerosol sealant, including pre- and post-testing with a duct blaster for before/after leakage numbers
Replace a main trunk line section (per 10-foot section)	$650 – $1,400	Removing old trunk duct, fabricating or fitting replacement, hanging and sealing, verifying airflow at affected registers

What drives the number up or down? Three things, mostly. First, access: a duct in an open, walkable attic is fast. A duct in a belly crawlspace with 18 inches of clearance and a vapor barrier to work around is slow, and slow means labor. Second, duct type: rigid metal duct in a 1970s Marietta home near the Square repairs differently than flex duct in a 2005 East Cobb subdivision. Metal needs fabrication or patchwork. Flex usually gets replaced section by section. Third, how much of the system is leaking: if one boot has failed, that’s a small job. If every joint in a 1960s duct system was taped with now-brittle cloth tape, the scope is bigger and so is the quote. We put the written price in front of you before any tool comes off the truck, so you’ll never be negotiating against a surprise invoice at the end.

What Affects Duct Repair & Sealing Pricing in Marietta

• Foundation and crawlspace type. Marietta’s older housing stock, especially the craftsman and ranch homes from the 1940s through the 1970s around Whitlock Avenue and Church Street, sits on vented crawlspaces with dirt floors and low clearance. Ducts in those spaces get damp, sag, and leak at the joints. Reaching them takes longer, and the repair has to account for moisture. Homes on slabs with ducts in the attic are usually faster to work on, but attic heat in July and August means scheduling work earlier in the day, which can slightly affect labor pricing during peak summer months.
• Age of the duct system. Ducts installed before roughly 1995 in Marietta were often sealed with gray cloth duct tape, the kind that dries out, cracks, and falls off. By 2026, those systems are 30 years old and most need systematic resealing, not just a patch. Newer systems installed under post-2000 Georgia energy code are more likely to have mastic-sealed joints and hold up better, so individual repairs tend to be smaller in scope.
• How many registers and returns the home has. A 1,200-square-foot ranch near Larry Bell Park might have 8 supply registers and 1 return. A 3,800-square-foot two-story off Johnson Ferry Road might have 18 supplies and 3 returns. More boots, more joints, more linear feet of duct means more labor and material for any sealing job, even before a problem is found.
• Whether the problem is a leak or a structural failure. A leak gets sealed. A collapsed duct, a duct that has been chewed through by rodents, or a flex duct that has separated entirely at a connection gets replaced. Repair prices and replacement prices are not the same, and the difference can be $200 to $800 per section depending on where the failure is and how long the run is.
• Moisture and mold conditions specific to Cobb County’s climate. Marietta’s humid subtropical climate means attic ducts sweat in the summer when the insulation jacket is damaged or the vapor barrier inside the flex is compromised. If we find moisture damage inside a duct, the repair scope changes: affected section replacement, drying out the surrounding area, and resealing so condensation can’t re-form. That adds labor and material.
• Testing and verification. Some Marietta duct repair companies quote a patch-and-go price. We quote a repair price that includes verification, because a duct that still leaks after the repair is not repaired. That means a smoke pencil test on the specific repair plus, on larger jobs, a duct leakage test. Verification adds a small amount of labor to every quote, but it’s the difference between guessing and knowing.

Is Duct Repair Worth the Cost in Marietta?

Short answer: almost always, if the leak is real. The U.S. Department of Energy has put duct leakage in typical homes at 20% to 30% of conditioned air. That means for every dollar you spend cooling or heating a Marietta home, 20 to 30 cents is going into the attic, the crawlspace, or the garage. Duct sealing pays for itself through the reduction in conditioned air loss, and it usually does so within two to five years depending on how leaky the system was to begin with.

But there’s a second reason Marietta homeowners call us for duct repair and sealing that isn’t about utility bills. Leaky return ducts pull air from the crawlspace or attic into the house. In Cobb County, crawlspace air often carries moisture, rodent dander, and whatever has settled on the vapor barrier. If you’ve noticed a musty smell when the HVAC kicks on, or dust accumulating on registers within a week of cleaning, the problem may not be your housekeeping. It may be the return side of your duct system pulling unfiltered air from outside the conditioned envelope. Sealing that leak changes what you’re breathing.

Our honest position at Linden Air Duct Marietta: if the ducts are intact and tight, don’t pay for work you don’t need. We’ll tell you that. If we inspect a system and the leakage is under 5% on a duct blaster, the right recommendation is to leave it alone. We’d rather lose a job than sell one that doesn’t help you. That’s part of how we’ve operated since 2004 under the Threshold Group standard, and it’s why our Duct Repair & Sealing in Marietta service includes a written price before any work starts, every single time.

How to Save on Duct Repair & Sealing

You don’t have to pay full freight for every duct problem. Here’s what actually saves money in the Marietta market, and none of it involves cutting corners that will cost you more later.

• Bundle sealing with a cleaning if your ducts are dirty. If your ducts need cleaning anyway, sealing while the system is already opened up saves on access labor. It’s cheaper to seal and clean in one visit than to schedule two separate trips.
• Fix the obvious access problems before we arrive. If there’s a clear path to the attic hatch or the crawlspace door is blocked by stored items, clearing that ahead of time saves labor minutes that show up on the invoice.
• Address moisture problems at the same time. If crawlspace moisture is causing duct damage, sealing without fixing the moisture means the repair will fail. Some duct repair companies won’t tell you that. We will. In some cases, the more cost-effective sequence is moisture mitigation first, ducts second. Skipping this step and having to redo the duct work in two years costs more than doing it in order.
• Get a real, written quote – not a phone estimate. A real quote means someone looked at your ducts. Phone estimates are guesses, and guesses almost always move in one direction when the technician arrives. Our written quote is free and it’s binding: same price at the end, every time. Call (912) 405-8840 to schedule one.
• Don’t wait until the failure is worse. A separated flex duct in June is a $400 repair. The same duct fully collapsed and blown off its connector in August, after a hot summer of the system struggling, can be a $900 replacement plus whatever damage the humidity caused. Duct problems compound. The sooner you fix them, the smaller the repair.

Marietta Homes We See Every Week

If you live in Marietta, you live in one of a few housing patterns, and each has its own duct problems. We know them because we’re in these houses every week.

Near the Marietta Square and surrounding historic districts, homes from the 1890s through the 1940s often have original floor plans retrofit with central air decades later. Ductwork in these homes is usually metal, frequently in a low crawlspace, and has been modified multiple times over the decades. We regularly find sleeves that dead-end into floor joists, return cavities built into wall stud bays that were never sealed at the bottom plate, and crumbling duct wrap. Repairs here trend toward the higher end of our ranges because access is tight and the original workmanship varies wildly.

In East Cobb, from Indian Hills to the neighborhoods off Lower Roswell Road, the homes are newer but the attics are hot and the flex duct is often 20 to 25 years old. We see a lot of failed foil tape at the boot connections where the flex collar meets the register. That’s a straightforward repair, usually $200 to $400 per boot depending on accessibility.

South and west of the Square toward Austell Road and Powder Springs Road, the ranch homes from the 1960s and 1970s sit on vented crawlspaces, and the duct work is frequently the original metal with failing external insulation. The ducts themselves may be structurally fine, but the insulation has absorbed years of crawlspace humidity and is doing nothing. Resealing these systems often pairs with reinsulating exposed runs, which adds material cost.

In West Cobb and around Kennesaw Mountain, newer construction with ducts in insulated attics tends to have fewer leaks per linear foot than older homes, but we still find disconnected flex runs from original installation errors. Builders seal what’s easy to reach, not what’s out at the far end of the attic. Sealing these systems is usually faster and lands in our middle price range.

The point isn’t that one part of Marietta has worse ducts than another. It’s that each housing type fails in a predictable way, and a repair quote should reflect the actual condition of your home, not a generic per-vent price we pulled from a chart. That’s what our written estimate gives you.

Our Repair and Sealing Process

People sometimes ask what they’re actually paying for when they hire us for duct repair and sealing in Marietta. Here’s the sequence, in plain order.

1. Inspection and diagnosis. We start by looking at the ducts themselves, not just listening to a description over the phone. That means opening the attic hatch, going into the crawlspace if there is one, pulling a register or two, and looking at how the system was originally built. We also ask about what you’re experiencing: hot or cold rooms, dust, smells, higher than expected bills.

2. Written price before any work begins. After inspection, we write down the scope and the price. Not a verbal range. A number on paper that won’t change unless you change the scope. This is a permanent part of how Linden Air Duct Marietta operates, not a promotion, and it’s been the practice since we started serving homeowners in 2004.

3. The repair or sealing itself. This is where the actual work happens. We cut out damaged flex, replace sections, mechanically clean joints, apply mastic, install mesh tape where the gap is wide enough to need it, and resecure sagging runs. We use professional-grade equipment from trade brands including Rotobrush and Nikro, and the materials we install, from mastic to tape to flex duct, are the same ones used by HVAC contractors, not homeowner patch kits.

4. Verification. We test what we touched. Smoke pencil at the sealed joints, visual inspection of the full run, and on larger jobs a pressure test that shows the leakage number before and after. If it doesn’t hold, we don’t call it done.

5. Written guarantee. Every repair we make is covered in writing. If a covered repair fails within 365 days, we come back and make it right at no charge. That’s the 365-Day Done Right Promise, and it’s on paper with every job, not implied.

Throughout this process, you’ll know exactly who is in your house. Every technician we send is background-checked and identity-verified under The Threshold Standard. Before the visit, you’ll receive the technician’s name and photo. When they arrive, they’ll show a photo ID badge at the door. This matters if you’re home alone, if you have young children, or if you’re simply someone who wants to know who you’re opening the door to before you open it. That’s the standard we’ve held since 2004.

Common Duct Problems We Repair in Marietta

Every house is a little different, but these are the duct failures we encounter most often in Cobb County. If you’re on the fence about whether you need a repair or a full replacement, this section will help you understand what you’re likely dealing with.

Separated flex duct at the connector. Flex duct attaches to a metal collar at the boot or plenum with a zip tie and tape. The tape fails first, then the flex slips off the collar entirely, dumping conditioned air into the attic or crawlspace. This is the single most common repair we do in East Cobb and West Cobb homes built since the 1990s. Typical price: $175 – $350 per connection, including resealing and testing.

Crushed flex duct. Flex duct collapses when it isn’t strapped properly, when someone stores boxes on top of it in the attic, or when rodents chew through the outer jacket and outer coil. A crushed section restricts airflow and creates uneven temperatures. We cut out the section and replace it with new flex, properly supported. Typical price: $450 – $900 per section depending on length and access.

Disconnected return plenum. Where the return duct meets the air handler or filter box, the connection can pull apart, especially if the original install used only tape and no mechanical fasteners. The result is the system pulling air from wherever the equipment sits, usually a garage or attic, rather than from the living space. Sealing this connection is one repair where the air quality payoff is immediate. Typical price: $350 – $650.

Leaking metal duct joints. On metal duct systems, especially in older Marietta homes, the longitudinal seams and branch connections were not sealed at installation, or the sealant has failed. Sealing these joints mechanically with mastic and mesh tape, then testing, runs $300 – $550 per 10 joints.

Rodent damage. Cobb County has a healthy rodent population, and attics and crawlspaces are prime habitat. Rats and squirrels chew through flex duct and sometimes nest in it. We see this most often in homes near wooded lots, around Kennesaw Mountain, and anywhere with mature trees close to the roofline. Damaged sections get replaced, and we’ll tell you if the damage is active so you can address the source before paying for repair. Replacement pricing is the same as any section replacement: $350 – $900 depending on location and extent.

Failed duct wrap and sweating. In Marietta’s humid summers, inadequately insulated metal ducts in vented attics and crawlspaces sweat. The condensation drips, the insulation gets wet, and eventually the duct exterior rusts or the insulation falls off. Repair involves drying the area, reinsulating, and sealing the vapor barrier. This pairs naturally with whole-system sealing and runs $500 – $1,200 for a typical affected area.

Duct Repair vs. Duct Replacement: How to Decide

This is the question behind every big quote: should you repair, or should you replace? Here’s the honest framework we apply in Marietta.

Repair makes sense when:

• The duct material itself is sound and the problem is a leak, a separated connection, or a crushable section
• The system is less than 20 years old and was reasonably installed to begin with
• Access is normal and the damage is localized to a few sections
• The rest of the HVAC system has useful life left

Replacement makes sense when:

• The duct system is 30+ years old and the original sealing has failed throughout
• There is widespread damage: rodent ingress everywhere, collapsed runs, rusted metal, saturated insulation
• The ducts were poorly designed from the start and no amount of sealing will fix airflow balance
• You’re already replacing the HVAC equipment, and the ducts are on their last legs anyway

If replacement is the honest recommendation, we’ll tell you that. We’ll also tell you what a repair would cost and why we think it would be a losing bet if that’s the case. The decision is always yours, but it should be made with real numbers and a written price in front of you. A full duct system replacement in Marietta typically runs $5,000 – $12,000 depending on home size, access, and duct type. That’s a different conversation than a $600 repair, and you deserve to know which one you actually need.

FAQs – Duct Repair & Sealing Cost

How much does duct sealing cost in Marietta?

Duct sealing in Marietta typically costs $300 – $950 for targeted sealing of accessible joints and connections, and $1,800 – $3,500 for whole-house aerosol sealing. The lower end covers sealing a handful of leaky boots or a short run of accessible duct. The higher end covers complete system sealing with before-and-after leakage testing. Most homes we see in Cobb County land somewhere in the middle. Call (912) 405-8840 for a written quote specific to your home – the estimate is free.

Is it cheaper to repair or replace ductwork?

Repair is almost always cheaper than replacement when the damage is localized. A typical duct repair in Marietta runs $285 – $950, while full duct replacement typically starts around $5,000 and goes up from there. Replacement only makes financial sense when the system is old, extensively damaged, or so poorly designed that repairs would be a series of losing bets. We’ll give you both numbers in writing and tell you which one we’d choose in your position.

How long does duct repair take in Marietta?

Most duct repairs take 2 to 5 hours on site, from inspection through verification. Single-boot resealing can be done in under 2 hours. Full-system sealing jobs take a full day or slightly longer. The biggest variable in Marietta is access: crawlspace jobs take longer than attic jobs, and homes with multiple returns or complicated layouts add time. We’ll give you a time window when we give you the written price.

Will duct sealing lower my energy bills in Marietta?

On a system with significant leakage, yes. Homes with 25% to 30% duct leakage, which is common in Marietta’s older stock, typically see utility bill reductions of 10% to 25% after proper sealing, with the repair usually paying for itself in 2 to 5 years. The exact number depends on how leaky the ducts are, how much you run your HVAC, and your home’s insulation. If we test your system and the leakage is already low, we’ll tell you not to spend the money.

Does Lindencome out on weekends for duct repair

Yes. Our phones are answered by a live person 24 hours a day, 7 days a week, and we schedule duct repair and sealing appointments on weekends when that’s what works for you. Call (912) 405-8840 any time and you’ll speak to a real person who can book the appointment, not an automated queue.

Do you give free estimates for duct repair in Marietta?

Yes. We inspect the ducts, write down the exact scope, and give you a written price before any work begins. The estimate costs nothing, and the price on paper is the price you pay if you choose to proceed. That’s how we’ve operated in the Marietta market since 2004, and it applies to every job, every time. Call (912) 405-8840 to schedule yours.

Who Shows Up at Your Door

We want to close this page by addressing the thing that matters to a lot of Marietta homeowners more than the dollar amount: who is walking through the door. Opening your home to a technician means letting a stranger into your personal space, often when you’re home alone or when your kids are there. That’s not a small thing.

Here’s exactly how we handle it. Every technician we send is background-checked and identity-verified through The Threshold Standard. Before the visit, you’ll receive the technician’s name and photo, so you know who to expect at the door. When the doorbell rings, the person standing there will be wearing a clean, marked uniform and will show you a photo ID badge before stepping inside. You get to verify that the face at the door matches the photo you were sent. Every time, no exceptions.

We put this system in place because homeowners told us it mattered. It’s not a gimmick, and it’s not something we do sometimes. It’s the standard we’ve held since joining the Threshold Group family in 2004, and it applies to every Linden Air Duct Marietta visit, whether it’s an air duct cleaning, a dryer vent cleaning, or a duct repair and sealing call like the one you’re reading about now.

Marcus Veale leads our team, and the standard he holds is simple: treat every home like it belongs to someone we know, and prove it with specific actions, not slogans. That means the written price before work starts, the written 365-day guarantee on every repair, the free second visit if a covered repair fails, and the verification step that confirms the work actually holds before we leave.

Get Your Written Duct Repair Quote in Marietta

If you suspect you have leaking, damaged, or inefficient ducts in your Marietta home, the next step is simple. Call us at (912) 405-8840. You’ll speak to a live person, not a phone tree. We’ll schedule an inspection, send you the name and photo of your technician before the visit, and give you a written price before any work begins. If the repair makes sense, we’ll do it right and back it in writing. If it doesn’t make sense, we’ll tell you that too.

Written by Marcus Veale, Owner at Linden Air Duct Marietta, serving Marietta, GA since 2004.

Pricing reflects the Marietta market as of 2026. Linden Air Duct Marietta offers free estimates – call (912) 405-8840.