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

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Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents

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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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How Much Does Duct Repair & Sealing Cost in Marietta?

Our Duct Repair & Sealing services in Marietta, GA typically cost between $350 and $1,200 for most single-family homes, with the average job landing around $550 to $750. Homes in East Cobb and West Marietta with older flex-duct systems — particularly those built between 1985 and 2005 — often run toward the higher end of that range due to access limitations and the volume of disconnected or crushed runs we find in those attics.

Duct Repair & Sealing Cost Breakdown (2026)

Duct repair pricing in Marietta breaks down by the type of work being done, not by the hour. Every job CleanRun quotes starts with a visual inspection and a written price before any work begins — that’s Duct Repair & Sealing in Marietta under Haven Standard Clause 1. No exceptions. What follows are the line-item ranges you should expect to see on any honest written estimate.

What Moves the Price Up or Down

The single biggest variable in Marietta is attic geometry. Ranch-style homes in neighborhoods like Kennesaw Road Estates or the older subdivisions off Whitlock Avenue tend to have wide, accessible attic spans that keep labor time reasonable. Two-story homes with low-pitch rooflines — common in the Cherokee Street corridor and parts of Historic Marietta — often require technicians to work in 18-inch clearances for extended periods, which adds time and therefore cost.

The second factor is duct material. Flex duct, which makes up the majority of residential systems in Marietta homes built after 1975, costs less per run to reconnect than rigid sheet metal but is more prone to multiple failure points across a single system. A home that has 12 flex runs and four of them are partially disconnected is a materially different scope than one with a single breach in a trunk line.

Third is whether a duct leakage test is run before and after the job. CleanRun photographs every duct run inside before and after work — that’s the Documented Photo Record included as a standard deliverable on every job — but a quantitative leakage test using a duct blaster instrument adds diagnostic precision and is recommended when a homeowner suspects significant energy loss. That test runs $150 to $300 as a standalone and is often credited toward the repair quote.

What Affects Duct Repair & Sealing Pricing in Marietta

• System age and duct material: Homes built in Marietta between 1978 and 2000 predominantly used flex duct rated for a 15-20 year lifespan. By 2026, those systems are well past that window. Deteriorated flex duct that crumbles when handled must be replaced, not patched, which shifts a sealing job into partial replacement territory and changes the price accordingly.
• Number of duct runs and zones: A 1,500-square-foot home in the Bells Ferry area might have 8 supply runs and 4 return runs. A 3,200-square-foot home in East Cobb’s Walton Reserve community could have 18+ supply runs, two air handlers, and a separate zone for the finished basement. More runs mean more joints to inspect, more photographs, and more sealing — the scope is directly proportional.
• Access difficulty: Ductwork in finished basements is significantly easier to reach than ductwork stapled to rafters in a low-pitch attic. Crawlspace ductwork in older Marietta homes near the Chattahoochee River corridors can involve moisture damage and mold remediation that extends the scope beyond sealing alone.
• Scope of damage found at inspection: A camera inspection sometimes reveals that what a homeowner thought was a single disconnected duct is actually a cascade — three runs sagging, two with punctures from pest activity, and one with a boot that was never properly secured during original installation. In Marietta, we regularly photograph pest-related duct damage in homes between Piedmont Road and the Cheatham Hill neighborhoods, particularly in houses with unconditioned crawlspaces.
• Sealing method chosen: Mastic sealant applied by hand at accessible joints is the lower-cost option and the right call for most jobs with clear access. Aeroseal — a pressurized polymer that seeks out leaks from inside the duct system — is more expensive upfront but is the only practical solution for leaks buried inside finished walls or in duct geometry that no technician can physically reach. For a home losing 25% of conditioned air through leakage, Aeroseal’s cost often pays back within two to three cooling seasons in Marietta’s climate.
• Whether duct cleaning is performed at the same time: Sealing ducts that are heavily contaminated — debris, biological growth, or construction dust from a renovation — before cleaning them is counterproductive. When both services are scheduled together, the combined price is lower than booking them separately, and the camera work done during cleaning directly informs the sealing scope. CleanRun has held a practice of photographing every run since our first job in 2013, so the documentation from a cleaning appointment carries directly into any subsequent repair estimate.

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How to Save on Duct Repair & Sealing in Marietta

Get a Written Price Before Anyone Touches Anything

The $79 special-offer mailers that circulate through Marietta ZIP codes 30060, 30062, 30064, and 30066 are priced to get a truck to your driveway — not to complete actual work. What typically happens: a technician arrives, runs a shop-vac for twenty minutes, then presents a verbal “upgrade” quote that is three to five times the advertised price, with no written scope and no documentation of what was found. Haven Standard Clause 1 is CleanRun’s written response to exactly that practice: every price is delivered in writing before work begins, and it doesn’t change without a written scope change signed by the customer. When you compare estimates, put them side by side in writing. That comparison alone tells you whether a company is giving you a price or a starting number.

Combine Duct Cleaning and Duct Sealing

Scheduling both services in the same appointment saves mobilization cost and eliminates the redundancy of two separate camera inspections. In practical terms, combining them in Marietta typically saves $75 to $150 compared to booking separately. The sealing work is also more durable when it’s applied to clean duct surfaces — mastic adhesion to a debris-coated metal joint is measurably weaker than adhesion to a freshly cleaned surface.

Use CleanRun’s Free Second Opinion

If another company has already given you a written estimate, bring it in. CleanRun will put our own number next to it in writing, at no cost. This isn’t a negotiating tactic — it’s a direct way to find out whether you’re looking at an accurate scope or an inflated one. Call (470) 516-9337 and have the written estimate ready when you do.

Ask About the Leakage Test Before, Not After

A pre-repair duct leakage test ($150 to $300) gives you a quantified baseline — expressed as a percentage of conditioned air lost — that tells you whether the repair scope is proportionate to the actual problem. Some Marietta homes test at 8-12% leakage, which is manageable and may only need targeted sealing at the most accessible joints. Others test at 28-35%, which justifies a more aggressive approach. Knowing the number before agreeing to a scope prevents over-repair on low-leakage systems and under-repair on systems that genuinely need full treatment.

Don’t Delay Disconnected Duct Repairs

A disconnected flex duct run in a Marietta attic is dumping conditioned air — air your HVAC system already paid to heat or cool — directly into 130-degree attic space every time the system runs. In a typical Marietta summer, that can add $40 to $90 per month to a utility bill. A single flex reconnection costs $85 to $175. The arithmetic resolves quickly. The longer the repair is deferred, the more the duct liner degrades at the disconnection point, which eventually turns a reconnection job into a full run replacement.

FAQs — Duct Repair & Sealing Cost in Marietta

How much does duct sealing cost in Marietta, GA?

Duct sealing in Marietta costs $350 to $950 for most single-family homes, depending on home size, number of duct runs, and access conditions. Small homes under 1,800 square feet typically fall in the $350 to $650 range. Larger East Cobb homes with complex attic configurations or two-zone systems run $750 to $1,200 or more. Aeroseal whole-system pressurized sealing — the option for leaks in inaccessible locations — runs $900 to $1,800 and includes a pre- and post-treatment leakage test. Every CleanRun quote is delivered in writing before work starts. Call (470) 516-9337 for a written estimate specific to your home.

Is duct repair worth the cost in Marietta’s climate?

Yes, particularly in Marietta, where the cooling season runs from mid-April through October and HVAC systems run hard for six or more months a year. A duct system losing 20% of conditioned air through leakage adds measurable cost to every utility bill during that stretch. At average Marietta electricity rates, a mid-size home with significant duct leakage can lose $600 to $1,200 per year in conditioned air. A repair job in the $500 to $800 range typically pays back in less than two cooling seasons on a system with moderate leakage. The payback period shortens as leakage severity increases.

Can duct leaks be repaired without replacing the whole system?

In most cases, yes. Localized flex duct disconnections, punctures, and loose joint seals can be addressed without replacing an entire duct system. The decision point is the condition of the duct liner itself. Flex duct that is structurally intact — no crumbling insulation, no collapsed inner liner, no sustained moisture damage — can be resealed or reconnected at the failure point. Flex duct that has deteriorated past the point of reliable repair needs to be replaced on a per-run basis. The camera inspection CleanRun runs before every job shows the exact condition of each run, photographed and documented, so the repair-versus-replace decision is based on what the camera shows, not a technician’s verbal description.

What is the difference between duct sealing and duct replacement, and which costs more?

Duct sealing addresses leaks at joints, connections, and small breach points while leaving the existing duct structure in place. Duct replacement removes and replaces individual runs or the full system. Sealing costs significantly less: $350 to $1,800 for a full sealing scope versus $1,500 to $5,000 or more for partial-to-full system replacement. The right answer depends on the age and physical condition of the duct material. A duct system installed in 2015 with a handful of loose joints is a sealing candidate. A system installed in 1989 with brittle liner, sagging runs, and multiple disconnections is a replacement candidate — and sealing it would be money spent on a system with a short remaining service life. CleanRun’s written estimate identifies which category each duct run falls into, with photographs as documentation.

How long does duct sealing last in Marietta?

Mastic sealant applied at accessible joints typically lasts 10 to 20 years when properly applied to clean, dry duct surfaces. Aeroseal’s polymer sealant is rated to similar longevity. The caveat in Marietta’s climate is moisture: crawlspace ductwork near areas with recurring humidity issues — common in older Marietta homes with unconditioned crawlspaces near Rottenwood Creek and the Sope Creek corridors — can see sealant failure accelerated by condensation and biological growth if the moisture source isn’t addressed simultaneously. Every CleanRun repair includes the 365-Day Done Right Promise: if the sealed work isn’t holding within a year, we make it right — in writing, not subject to manager approval.

Does CleanRun offer free estimates for duct repair in Marietta?

Yes. Every CleanRun estimate is free and delivered in writing before any work starts — that’s Haven Standard Clause 1, and it applies to every job without exception. If you already have a written estimate from another company, CleanRun will put its own number next to it at no cost. Call (470) 516-9337 to schedule. A live person answers every call.

Why Marietta Homeowners Use CleanRun for Duct Repair

CleanRun has been photographing the inside of duct runs since our first job in 2013. Every customer receives a documented photo record when the crew leaves — before and after, every run — not as an optional upgrade but as a standard deliverable included in every job. That practice exists because a before photo is the only honest way to show what was actually repaired and why.

Technicians are background-checked and uniformed under Haven Standard Clause 3: Verified Crews, and identified by name before arrival. Equipment on every duct job comes from trade-recognized manufacturers — Rotobrush, Nikro, Abatement Technologies, Honeywell, Aprilaire, and Guardsman — brands customers can look up and verify independently before agreeing to a price.

The 365-Day Done Right Promise means every repair is accountable for a full year after the truck leaves. Not subject to manager approval. Written on the job record. If it isn’t right, we make it right.

Tomas Reyes leads every CleanRun job under that standard. Since 2013, that’s meant 52,000+ homes served, every one with a written price before work started and a documented photo record when the crew left. The same standard applies to every Marietta job booked today.

For homeowners who want to see what’s actually in their ductwork before deciding anything, the right first call is (470) 516-9337. You’ll get a written price, a photographed record of every run, and a year-long written guarantee on the work. That’s what an honest duct repair estimate looks like in Marietta in 2026.

To understand the full scope of what duct repair and sealing involves before booking, the CleanRun home has the complete service overview and documentation standards in one place.

Key Takeaways

• Duct repair and sealing in Marietta, GA costs $350 to $1,200 for most homes, with the typical job falling between $550 and $750.
• Aeroseal whole-system pressurized sealing runs $900 to $1,800 and is the right option for leaks in inaccessible duct locations.
• Home size, duct material, attic access, and leakage severity are the four main cost drivers in the Marietta market.
• A pre-repair duct leakage test ($150 to $300) quantifies the problem before you agree to a scope — that number should appear on any honest written estimate.
• Combining duct cleaning and sealing in one appointment saves $75 to $150 and produces a more durable seal on clean duct surfaces.
• Every CleanRun job comes with a written price before work starts, a documented photo record of every duct run, and the 365-Day Done Right Promise — in writing.
• CleanRun offers a free second opinion on any written competitor estimate. Call (470) 516-9337.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Marietta, serving Marietta, GA since 2013.

Pricing reflects the Marietta market as of 2026. CleanRun Air Duct Cleaning Marietta offers free estimates — call (470) 516-9337.