Duct Repair & Sealing Cost - Leakage Measured, Then Priced in Writing

How Much Does Duct Repair & Sealing Cost in Marietta?

Duct repair and sealing in Marietta, GA typically costs between $650 and $1,850, with most homeowners paying around $1,100 for a standard whole-home sealing job that covers roughly 20 to 30 linear feet of accessible ductwork. Smaller, targeted repairs like patching a single leak or reattaching a disconnected section run $150 to $450. If you need full duct replacement, you’re looking at $3,000 to $7,000 depending on attic or crawlspace access and the square footage of your home.

Call (762) 216-4075 for a free written estimate. We give you a firm price before any work starts, and that number doesn’t change at the door.

Duct Repair & Sealing Cost Breakdown (2026)

Here’s what you can expect to pay in the Marietta market in 2026. These numbers reflect real job quotes in this metro, not national averages from a website that’s never been to Cobb County.

Service	Typical Cost Range	What It Includes
Single leak patch or small hole repair	$150 – $300	Accessing one visible leak, sealing with mastic or metallic tape, testing connection
Reconnecting a disconnected or sagging duct	$200 – $450	Reattaching duct to register or plenum, resealing joint, adding support straps if needed
Whole-home duct sealing (aeroseal)	$1,200 – $2,500	Sealing from inside using aerosolized sealant, includes pre- and post-test
Whole-home duct sealing (manual, mastic + tape)	$650 – $1,850	Sealing all accessible joints, boots, and plenums with mastic and UL-listed tape
Duct insulation replacement	$400 – $1,100	Removing degraded or pest-damaged insulation, wrapping with new R-6 or R-8
Sectional duct replacement (10 – 20 ft)	$800 – $2,200	Removing crushed or mold-contaminated section, installing new flex or rigid duct
Full duct system replacement	$3,000 – $7,000+	All supply and return ducts replaced in a typical 1,500 – 2,500 sq ft Marietta home

Those manual sealing prices assume a typical single-story ranch or two-story traditional home with a crawlspace or accessible attic. In Marietta, that covers most of the housing stock from Sprayberry to East Cobb to the historic districts off Whitlock Avenue.

What Drives the Price Up

Pricing shifts based on a few things that are unique to your house. Attic access matters a lot. If your ductwork is buried under blown-in insulation, we spend more time clearing a path and resealing everything once we’re done. Crawlspaces are the same story, especially in older Marietta homes where the clearance is tight and the ground is damp. The number of supply and return boots also matters. More registers means more connection points to inspect, clean, and reseal.

Pest damage is another big one. In Marietta, squirrels chewing through flex duct in attics is something we see on a weekly basis. Rodents in crawlspaces too. If the damage is extensive, a patch job becomes a sectional replacement.

What Drives the Price Down

If your ductwork is mostly intact and you just need a few joints resealed, you’re looking at the low end of that table. Homes with open, walkable attics and clean crawlspaces are faster to work in. Also, if you combine duct sealing with a full air duct cleaning, you’ll usually save on the overall bill because we’re already in the home, equipment is set up, and the cleaning clears the way for better adhesive bonding.

What Affects Duct Repair & Sealing Pricing in Marietta

• Access to ductwork. Attics and crawlspaces that are open and walkable are cheap to work in. If your ducts are in a tight, low-clearance crawlspace under a 1950s ranch in East Marietta, the labor hours go up and so does the price.
• Duct material and age. Older metal duct from the 1970s and 80s takes different sealing materials than modern flex duct. Metal needs mastic and sometimes new gaskets at the joints, which is slower, more involved work.
• Extent of the leaks. One disconnected boot at a register is a quick fix. A dozen leaky joints spread across a 900 sq ft attic is a full-day project. We test with a pressure pan to find exactly where the air is escaping, and that also tells us how much work is ahead.
• Pest or moisture damage. Marietta’s humid summers and active rodent population mean some ducts need more than sealing. If insulation is saturated or a section has been chewed through, you’re looking at replacement costs layered on top of sealing.
• Number of registers and returns. A two-story home with 14 supply runs and 3 returns has more connection points than a small ranch with 8 supplies. Every boot gets inspected and sealed if needed, so the count matters.
• Season and urgency. Peak season in Marietta runs June through September when AC systems are running constantly and people notice the air loss. Same-day or emergency calls during those months cost more than off-season work scheduled in advance.

Signs You Need Duct Repair or Sealing

Most Marietta homeowners call us because they’ve noticed one of a handful of things. The rooms upstairs never quite cool down in July. The power bill climbed from one summer to the next even though the HVAC unit is only five years old. Dust shows up on the furniture a day or two after cleaning, and it’s especially heavy around the ceiling vents.

You might also see visible damage in the attic: a section of flex duct is sagging, disconnected, or crushed under a box of holiday decorations. Or you can hear a faint hissing from behind the walls when the blower runs. That hiss is conditioned air escaping into unconditioned space, and it’s the single most common complaint we get in the months when humidity in Marietta sits above 70%.

Why Duct Sealing Matters More in Marietta Than You Might Think

The combination of high heat and high humidity here means your AC does double duty all summer. If 20% of your conditioned air is leaking into the attic or crawlspace, your system runs longer, works harder, and pulls in humid outside air through whatever gaps exist in the return side. That humidity gets distributed through the house, which makes everything feel muggier and can lead to condensation issues around the vents themselves.

According to the Department of Energy, the typical home loses 20 – 30% of the air moving through its ducts to leaks, holes, and poorly connected joints. In a climate like Marietta’s, that number tends to sit at the higher end because the temperature differential between the attic and the conditioned space is so extreme in July and August. Sealing those leaks is often cheaper than replacing an overworked HVAC unit that failed early because it was doing the work of a system twice its size.

What a Duct Repair Visit Looks Like

When Cardinal Air Duct Marietta comes out for a repair or sealing job, the process is straightforward. First, we do a full inspection of the accessible ductwork. That means the attic, the crawlspace, and every register inside the house. We’re looking for disconnected boots, crushed flex, gaps at the plenum, and visible mold or pest damage.

Then we get a written price into your hands before any work starts. That’s not a ballpark. It’s a line-item quote that covers exactly what we’ll do, what materials we’ll use, and how long it will take. If we find something else while we’re in the attic, the quote gets revised and approved by you before we touch it. There’s no surprise line item at the end.

The work itself involves cleaning the areas that need sealing, applying mastic or UL-listed metallic tape, and then testing the connection. Our team runs professional-grade equipment: Rotobrush brush systems for agitation during cleaning, Nikro HEPA-filtered extraction units so debris goes into a sealed vacuum, and Abatement Technologies containment when we’re dealing with mold or heavy contamination that needs to be isolated. Once the sealing is done, we run a pressure test to confirm the leaks are actually closed, then take before-and-after photos so you can see what was done.

Everything is guaranteed in writing for a full 365 days. That’s the 365-Day Done Right Promise from Cardinal Air Duct Cleaning. If any repair fails within the year, we come back and make it right at no charge. No fine print, no prorated anything, no argument about whether it was really our fault.

Repair vs. Replace: When Sealing Isn’t Enough

This is the question most homeowners actually have, even if they don’t say it out loud: “Should I keep patching this ductwork, or is it time to replace the whole system?”

The honest answer depends on three things: age, extent of damage, and duct material. Most flex duct has a lifespan of about 15 to 20 years. If your home in Marietta was built before 2005 and the ducts have never been touched, you’re likely dealing with degraded insulation, brittle outer jackets, and joints that no longer hold. In that case, resealing the whole system might buy you a few years, but full replacement is the better investment and the more honest recommendation.

If the ducts are under 10 years old and the only issues are a few disconnected boots or loose joints, repair is the clear choice. You get all the benefit of proper sealing without the cost of new ductwork. A good rule of thumb: if more than 30% of your accessible duct shows signs of physical damage, sagging, or contamination, replacement is worth a serious look.

We’ll always give you the straight answer with the numbers to back it up. You’ll see the repair quote and the replacement quote side by side, and we’ll tell you which one we’d pick if it were our house. No pressure. Just facts.

How to Save on Duct Repair & Sealing

• Schedule in the off-season. The busiest months for duct work in Marietta are May through September. If you can wait until October or November, you’ll often get more scheduling flexibility and sometimes lower pricing since demand is softer.
• Combine cleaning and sealing. If your ducts need a cleaning anyway, bundling the two services means our crew only has to set up once. That reduces the total labor time and you’ll usually see a lower combined price than doing them separately months apart.
• Fix problems early. A single disconnected duct that goes unrepaired for a year can cause temperature swings, strain on your HVAC, and higher power bills. The small fix is always cheaper than the compounding consequences.
• Seal what’s accessible first. If your attic is mostly open but one section runs under a finished area, sealing the accessible ductwork now can deliver big efficiency gains without the cost of drywall cutting. We’ll tell you exactly which portions are worth doing now and which can wait.
• Get a free estimate before you commit to anything. Call (762) 216-4075 and we’ll walk you through what a repair or sealing job would cost for your house, in writing, before any work starts. Knowing the real number costs you nothing.

Marietta-Specific Factors That Affect Your Ductwork

Marietta sits at an elevation of about 1,129 feet, which is high enough to shave a few degrees off the Atlanta furnace but still plenty hot and humid through the summer. The average high in July runs 88 – 90°F with humidity that makes it feel like 95+. That’s the environment your ductwork lives in, and it’s especially rough on the attic side.

In a typical Marietta attic, summer temperatures climb to 130°F or more. Flex duct is just insulated plastic and wire. Over years of that kind of heat cycling, the outer jacket degrades, the insulation compresses, and the inner liner becomes brittle. Joints that were sealed with tape from 1998 dry out and fail. That’s why we see so many homes in older neighborhoods like Whitlock Heights, Mountain View, and the streets off Powers Ferry Road with ducts that are technically intact but leaking badly at every connection point.

The other local factor is the humidity. When return ducts pull air from a crawlspace or attic that’s already damp, they bring that moisture into the system. In Marietta, where the relative humidity can sit at 80% for weeks at a time in August, that moisture condenses inside the ducts and collects at the low points. Over time, that leads to insulation breakdown and, in severe cases, mold growth inside the ducts themselves. Proper sealing on the return side is critical to keeping that humid outside air from entering the system in the first place.

Rodents are also a consistent problem here. Squirrels in the attic, rats in the crawlspace, and the occasional chipmunk that finds its way into a vent. They chew through flex duct because the material is easy to get through and the conditioned air inside is comfortable. When we find pest damage, sealing in and of itself won’t solve it. We’ll repair or replace the damaged section, reseal the connection points, and recommend pest exclusion measures so the problem doesn’t return in six months.

Why Upfront Pricing Actually Matters

Duct repair has a reputation problem in this industry. Homeowners are used to getting a vague range over the phone, then watching the number climb once the tech is in the attic. That’s not how we operate.

Duct Repair & Sealing in Marietta with Cardinal Air Duct Cleaning follows what’s called The Relay Visibility Guarantee. The company is part of the Relay Home Co. family, which has been operating since 2005, and every Cardinal location is held to the same standard. Here’s what that standard means for you: a written price before any work begins, a live arrival window you can track on your phone, before-and-after photo documentation of the work, and a digital invoice you can pay from a link. No clipboard, no carbon-copy receipt, no “we’ll mail it to you.”

Omar Haddad leads the Marietta team, and he’s the one who makes sure every job goes out with a written price attached. If something changes mid-job, you approve the change in writing before anyone reaches for a tool. The number you see on the estimate is the number you pay, unless you agree to something different in advance.

And every repair carries a Written Guarantee on Every Repair. If that repair fails within 365 days, the second visit is free. That’s the 365-Day Done Right Promise, and it covers every single job without exception. Not the “premium package.” Not the “select customer” tier. Every job.

What Tools and Materials We Use

You can’t get a clean seal with dirty surfaces, and you can’t get a lasting seal with the wrong adhesive. That’s why we run professional-grade equipment, not a shop-vac from the garage.

For cleaning before sealing, we use Rotobrush rotary brush systems. The brushes agitate the inside of the duct, loosening dust, debris, and old degraded sealant so the new mastic bonds directly to the metal or flex liner. For extraction, we use Nikro HEPA-filtered vacuum units. That’s negative-pressure extraction, which means the loosened debris goes straight into the vacuum, not back into your living room. When the job involves mold removal or heavy contamination, we use Abatement Technologies containment units to isolate the work area and prevent cross-contamination.

For the actual sealing, we use high-quality mastic and UL-listed metallic tape. Mastic is a thick, brush-on sealant that hardens into a durable, airtight bond. It doesn’t dry out, crack, or peel like the cheap plastic tapes you see at the hardware store. For projects that require sealing leaks deep inside the duct walls where we can’t physically reach, we offer aeroseal sealing, which pressurizes the system and coats the interior with aerosolized sealant that finds and fills the gaps. After any sealing job, we run a pressure test to verify the improvement, and we show you the before-and-after numbers.

How Much Energy Can Duct Sealing Actually Save?

The Department of Energy puts the typical home’s duct leakage at 20 – 30% of the total air moving through the system. That means every month, roughly a quarter of the air your AC cools or your furnace heats never makes it to the rooms it’s supposed to reach. It leaks into the attic or crawlspace and absorbs heat or cold from unconditioned air.

For a typical Marietta home, that translates into real money. If your summer electric bills run $250 a month and 25% of your conditioned air is escaping, you’re paying about $60 to $70 a month to cool an attic. Over a year, that’s $700 to $800 in wasted cooling and heating. The math on a $1,100 sealing job works out to a payback period of roughly 18 to 24 months, and that’s before accounting for the extended lifespan of your HVAC unit, which no longer has to run as long or as hard to hit the same indoor temperature.

Beyond the energy savings, there’s also the comfort factor. Sealed ducts mean the air that reaches your bedroom in East Cobb is the same temperature as the air leaving the air handler. No more upstairs rooms that never quite cool down, no more dust blowing from the vents, no more musty smell when the system kicks on. The difference is noticeable within a day of the work being done.

FAQs – Duct Repair & Sealing Cost

How much does duct sealing cost in Marietta, GA?

Duct sealing in Marietta typically runs $650 to $1,850 for a standard whole-home manual sealing job using mastic and metallic tape. Aeroseal, which seals from the inside using aerosolized sealant, runs $1,200 to $2,500. Your exact quote depends on the number of boots, access to the attic or crawlspace, and the condition of the existing ductwork. Call (762) 216-4075 for a free written estimate.

Is it cheaper to repair or replace ductwork?

Repair is almost always cheaper in the short term, at $150 to $450 for small fixes and $650 to $1,850 for comprehensive sealing, versus $3,000 to $7,000 for full replacement. But if your ducts are more than 15 to 20 years old, or more than 30% of the system shows physical damage, replacement may deliver better long-term value. We’ll show you both prices side by side so you can decide with real numbers, not a sales pitch.

Can you repair ducts the same day?

Yes. Most single-leak repairs and sectional replacements can be completed same day in Marietta, especially if you call early in the morning. Whole-home sealing jobs typically take 6 to 10 hours depending on access. When you book through Cardinal Air Duct Cleaning, a live person answers 24/7 and the service includes a live trackable arrival time through The Relay Standard, so you know exactly when we’ll be there.

How much does it cost to fix a disconnected duct?

Reconnecting a disconnected or sagging duct in Marietta typically costs $200 to $450. That includes accessing the duct, reattaching it to the register or plenum, sealing the joint with mastic or UL-listed tape, and adding support straps if the original ones failed. If the disconnection caused damage to the duct liner or insulation, we’ll quote any additional work in writing before proceeding.

Do you give free estimates for duct repair in Marietta?

Yes. Every estimate is free, written, and valid before any work starts. We don’t change the price at the door. Call (762) 216-4075 and we’ll schedule a time to inspect your ductwork and get you a firm number, often the same visit if the repair is straightforward.

What’s the 365-Day Done Right Promise?

The 365-Day Done Right Promise is a full-year guarantee on every repair and sealing job we do in Marietta. If the work isn’t right within 365 days, we come back and fix it at no charge. Every repair also comes with a written guarantee and a free second visit if it fails. There’s no fine print and no exceptions, and you’ll see it in writing before the job starts.

Marietta Neighborhoods We Serve

Our team works throughout Marietta and the surrounding Cobb County area, including the historic neighborhoods off Whitlock Avenue and Powder Springs Street, the East Cobb communities near Johnson Ferry Road and Roswell Road, Sprayberry, Sewell Mill, Sandy Plains, and the areas around Marietta Square. If you’re in a ranch home from the 60s near the Square, a 90s two-story in East Cobb, or a newer build near Kennesaw Mountain, we know how your ductwork was likely installed and where it’s most vulnerable.

Older homes in the city center tend to have metal duct with failing tape at the joints. Suburban homes from the 80s and 90s usually run flex duct that’s now past its useful life. Newer construction often has ductwork that was installed quickly and never properly sealed in the first place. Each one needs a slightly different approach, and we’ve seen all of it hundreds of times across this market.

Get a Written Price Today

If you suspect your ducts are leaking, or you’ve got a repair that’s been on the back burner, don’t guess at the cost. Call (762) 216-4075 and we’ll give you a written price for the exact work your home needs. A live person answers, 24/7. You’ll get a trackable arrival window, before-and-after photos of the work, and a digital invoice you can pay from your phone. That’s the Relay Standard, and it’s how every Cardinal Air Duct Cleaning job in Marietta goes out.

We’re part of the Relay Home Co. family, founded in 2005 and built on transparency. No vague ranges. No price changes at the door. No wondering who’s showing up. Just a written price, a guaranteed repair, and a sealed duct system that finally behaves the way it should.

Call (762) 216-4075 now, or visit our home page to learn more about the full range of air duct, HVAC, and dryer vent services we offer in Marietta.

Written by Omar Haddad, Owner at Cardinal Air Duct Marietta, serving Marietta and Cobb County since joining the Relay Home Co. family, founded 2005.

Pricing reflects the Marietta market as of 2026. Cardinal Air Duct Marietta offers free estimates – call (762) 216-4075.