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

Every visit starts with

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

Worth knowing

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.

Styles & brands we work with

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Before & after – our own jobs

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How Much Does Duct Repair & Sealing Cost in Johns Creek?

Our Duct Repair & Sealing services in Johns Creek, GA typically run between $350 and $1,200 for most single-family homes, with the average job landing around $600-$750. Homes with extensive disconnections, crushed flex duct, or unsealed plenum gaps – common in the 1990s-era subdivisions around Medlock Bridge and Abbotts Bridge Road – can push toward $1,500 or higher. At CleanRun, every price is written and handed to you before any work begins; that is not a promotional promise, it is Haven Standard Clause 1.

Duct Repair & Sealing Cost Breakdown (2026)

These ranges reflect actual job data from Johns Creek homes served by CleanRun since 2013. The variables are described in the section that follows, but this table gives you an honest starting point before you call anyone.

What Pushes the Number Up or Down

The single biggest cost driver in Johns Creek is attic access. A large percentage of homes in this market – particularly those built in the late 1980s through the mid-2000s in neighborhoods like Medlock Bridge, Country Club of the South, and Bellmoore Park – run their entire duct system through unconditioned attics. In a Georgia summer, attic temperatures regularly exceed 140 degrees Fahrenheit. That heat accelerates the deterioration of flex duct inner liners and causes mastic at joints to crack faster than it would in a conditioned crawl space. When a technician has to work on their knees across blown-in insulation at 95 degrees outside, the labor component reflects that reality.

System size matters directly. A 2,000 sq ft townhome near State Bridge Road might have 10 duct runs; a 5,000 sq ft home in St. Ives Country Club could have 22 or more, each with multiple connection points. More connections mean more potential leak sites and more time to seal each one correctly.

Accessibility is the other major variable. Ducts running across open attic spans cost less to reach than ducts buried under a foot of blown-in insulation or tucked into a knee wall. If your system includes buried duct board sections – a construction method common in Johns Creek homes from the early 1990s – expect higher labor costs or a recommendation toward Aeroseal, which seals from the inside and bypasses the access problem entirely.

What Affects Duct Repair & Sealing Pricing in Johns Creek

• Home age and duct material: Homes built before 1995 in Johns Creek often have fiberglass duct board or early-generation flex duct that has become brittle. Duct board requires sheet-metal patching or full section replacement rather than simple mastic application, which adds both material and labor cost. Rigid metal systems from this era hold up better but develop joint failures at every seam over 30 years.
• Duct location – attic versus crawl space: Johns Creek has very few homes with crawl-space duct systems; the vast majority run through unconditioned attics. Attic work in Georgia’s climate is physically demanding and time-limited in peak summer months, which factors into honest labor pricing. Crawl-space systems, when they do exist, add a different set of challenges – moisture exposure and pest intrusion are the more common damage patterns there.
• Number and severity of leaks: A camera scope – the same photo record CleanRun documents on every visit – determines how many connections are compromised and how badly. A single detached boot is a 20-minute fix. A system where every flex duct connection has lost its mastic seal over 25 years is a different scope of work, and the written price will reflect that before anyone picks up a sealant brush.
• Sealing method selected: Mastic and foil tape are the trade-standard approaches for accessible connections and visible gaps. Aeroseal – a pressurized polymer mist that travels through the duct system and seals from the inside – is more expensive upfront but reaches leaks that no hand-applied method can touch. It also produces a computer-generated leakage report, which is useful documentation for homeowners who want a before-and-after measurement rather than just a technician’s verbal assurance.
• Concurrent cleaning: If your duct system needs both cleaning and sealing, scheduling them together reduces total cost because the diagnostic access work is done once, not twice. Johns Creek homes that have gone 10 or more years without a duct inspection frequently need both services; the camera scope makes that determination before pricing is set.
• Permit requirements: Gwinnett County and Fulton County have different thresholds for when HVAC duct work requires a permit. Johns Creek sits in Fulton County. Whole-system Aeroseal and substantial duct replacement may fall under permit requirements depending on scope; CleanRun identifies this during the written quote phase so there are no surprises on job day.

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The $79 Coupon Problem – What Johns Creek Homeowners Keep Reporting

This comes up often enough that it deserves its own section. In Johns Creek – and in adjacent communities like Duluth, Alpharetta, and Suwanee – there is an active pattern of companies advertising duct cleaning or duct sealing for a flat rate that reads like $79 or $99 for the whole house. The technician arrives, looks around the attic or crawl space, and the quote multiplies three to five times before any work starts. By that point the homeowner has taken time off work and the truck is parked in the driveway.

The way CleanRun operates is structurally different. Haven Standard Clause 1 means the written price is on paper before the first panel comes off. If the scope changes because the camera finds something unexpected, we stop and write a revised price. The customer approves it or we close everything back up and leave – no pressure, no theatre. That is not a sales pitch; it is a documented operating procedure, and it has been the standard since our first job in 2013.

For any homeowner comparing quotes, our Free Second Opinion applies directly here: bring us a written estimate from another company, and we will put our own number next to it in writing. That offer does not require a commitment, and it does not come with a sales call at the end.

What CleanRun’s Documented Photo Record Shows in Johns Creek Homes

One reason we describe what the camera finds rather than how we feel about it: the photos are more persuasive than any copy on this page. In Johns Creek attic systems, the camera most commonly shows three things.

First, separated flex duct connections at the boot – the collar that connects the flex run to the register box in the ceiling. In homes built between 1988 and 2000, these connections were often secured with a single wrap of duct tape (not HVAC-grade foil tape) that has since failed. The inner liner pulls back, air dumps into the attic, and the room served by that run heats up faster than others in summer. We see this in virtually every home over 20 years old in neighborhoods like Rivermont, Nesbit Lakes, and the older sections of Parsons Plantation.

Second, cracked or missing mastic at plenum connections. The supply plenum – the main distribution box that feeds conditioned air from the air handler into the branch runs – is where the most air loss typically occurs in older systems. Cracks here can represent 15 to 25 percent of total system air loss.

Third, damaged duct insulation on the exterior of flex duct runs. This is not a sealing issue in the strict sense, but it means the conditioned air inside is absorbing heat from the attic before it reaches the register. In a Johns Creek summer, that thermal penalty is measurable on your utility bill.

Every one of those findings is documented with before photographs. The after photographs confirm the repair. That record is a standard deliverable on every CleanRun job, not an add-on.

How to Save on Duct Repair & Sealing in Johns Creek

There is a right way to reduce what you spend on duct repair, and a wrong way. The wrong way is choosing the lowest bid without understanding what it includes – that path leads to re-work within two to three years when the tape fails or the mastic was never applied correctly. The right way involves a few practical steps.

• Get the camera scope first. Do not approve repair work without a documented inspection that shows you what is actually wrong. A technician who quotes repairs without camera access is estimating, not diagnosing. The photo record from the inspection also becomes the baseline for the after photos, so you have proof the repair happened.
• Bundle cleaning and sealing when both are needed. The diagnostic access is the same for both services. Scheduling them together on one job day saves a service call fee and reduces total labor time. If your system is more than 10 years old and has never been inspected, assume both are on the table until the camera says otherwise.
• Compare written estimates, not verbal ones. A verbal quote has no value at dispute time. Any company worth hiring will put the scope and price in writing before work starts. If they won’t, that tells you something.
• Ask about the sealing method being proposed and why. Mastic is appropriate for accessible joints. Aeroseal is appropriate for diffuse leakage throughout the system. A technician recommending Aeroseal on a system where all the leaks are visible at the boot connections is upselling. A technician recommending hand-sealing on a system with 30 percent air loss is under-solving. The method should follow the diagnosis.
• Use the Free Second Opinion. If you have a written estimate from another company, bring it to CleanRun. We will put our number next to it in writing. There is no charge for that comparison and no obligation to book.

For a written price on your Johns Creek home, call (470) 326-1926. The estimate is free, it is written, and it does not move once you approve it.

How Duct Leakage Affects Johns Creek Energy Bills

The U.S. Department of Energy estimates that a typical ducted HVAC system loses 20 to 30 percent of conditioned air through leaks before that air reaches the intended room. In Johns Creek, where summer cooling seasons run from late April through October, that leakage translates into real dollar amounts. A home with a $350 monthly electric bill in July that loses 25 percent of conditioned air through duct leaks is spending roughly $85 per month cooling an attic it did not intend to cool.

The payback calculation on duct sealing depends on the severity of the leakage and the method used. A whole-system Aeroseal treatment that reduces leakage from 30 percent to under 5 percent – which is a realistic outcome on a well-maintained system with diffuse seam failures – can pay for itself within two to three Georgia cooling seasons on a home above 3,000 square feet. Mastic sealing of specific high-loss connections costs less upfront and pays back faster in homes where the leakage is concentrated at identifiable joints.

Neither of those is a guarantee, and CleanRun does not present utility savings projections as promises. What the Aeroseal system does produce is a computer-measured leakage percentage before and after treatment – actual data, not an estimate – so you have a document showing what changed, not just a technician’s word for it.

Duct Repair vs. Duct Cleaning: Which Does Your Johns Creek Home Need?

These are different services that address different problems, and they are frequently confused in marketing material. Duct cleaning removes accumulated debris – dust, pollen, dander, mold spores, and in some Johns Creek attic systems, insulation particles that have migrated through failed liner seams – from the inside surfaces of the duct runs. Duct repair and sealing fixes the physical integrity of the duct system: disconnections, gaps, cracks, and leaks that allow conditioned air to escape or unconditioned air (and attic contaminants) to enter.

A cleaned duct system that still leaks will pull attic debris back in within months. A sealed duct system that has a heavy debris load will continue circulating that debris after sealing. The correct sequence when both conditions are present is cleaning first, sealing second – and a camera scope at the start of the cleaning job is what tells you whether sealing is also needed.

Our Duct Repair & Sealing in Johns Creek service page covers the technical process in more detail. If you want to understand the full scope of what CleanRun offers in this market, the home page lists every service category.

FAQs – Duct Repair & Sealing Cost in Johns Creek

How much does duct sealing cost in Johns Creek, GA?

Duct sealing in Johns Creek costs between $350 and $2,200 depending on the method and the size of the system. Hand-applied mastic sealing of accessible joints runs $50 to $150 per connection; a typical Johns Creek home with 12 to 16 branch connections might land between $600 and $900 for a thorough mastic treatment. Whole-system Aeroseal – which pressurizes the duct system and seals from the inside – runs $1,200 to $2,200 and includes a computer-measured leakage report. Call (470) 326-1926 for a written estimate specific to your home’s layout and system age.

Is duct sealing worth it in Georgia’s climate?

For most Johns Creek homes, yes – particularly those with flex duct systems installed before 2005. Georgia’s cooling season is long (typically 6 months of meaningful air conditioning demand), and attic temperatures here regularly hit 130 to 140 degrees Fahrenheit. A duct system losing 20 to 25 percent of conditioned air into that attic is a measurable monthly cost, not a theoretical one. The payback period for mastic sealing of a system with concentrated leaks at the boots and plenum is typically 12 to 24 months in this climate. For a whole-system Aeroseal treatment on a larger home, expect 2 to 4 years depending on utility rates and usage.

Can duct repair be done the same day in Johns Creek?

Most single-run repairs and boot reconnections can be completed same-day or next-day. A job involving mastic sealing across 12 or more connections, or a full flex duct replacement on multiple runs, typically takes 4 to 6 hours for a two-person crew. Aeroseal requires a dedicated 3 to 4 hour setup and pressurization window on top of any access prep. All calls to CleanRun are answered by a live person, and scheduling reflects what your specific job actually requires – not a compressed window to get the truck somewhere else faster.

How do I know if my Johns Creek home needs duct repair?

The most reliable indicator is a camera inspection, not a symptom list – though there are common signals. Rooms that heat up faster than others in summer despite the same thermostat setting often point to a disconnected or heavily leaking run serving that area. A utility bill that has climbed noticeably without a change in usage or equipment age is another. In Johns Creek, homes built between 1988 and 2000 in neighborhoods like Medlock Bridge, the older sections of Parsons Plantation, and along Jones Bridge Road are the most common candidates because those duct systems are now 25 to 35 years old. A documented camera scope – the same photo record CleanRun includes as standard on every visit – answers the question definitively.

Is it cheaper to repair existing ducts or replace them?

Repair is almost always cheaper in the short term. Replacing a full duct system in a Johns Creek home typically runs $3,000 to $8,000 depending on system size and access conditions – considerably more than sealing the existing system. The case for replacement rather than repair arises when the duct material itself has failed beyond what sealing can address: inner liner collapse in aged flex duct, saturated and crumbling duct board, or a system so extensively damaged that the repair cost approaches replacement cost. A camera scope shows that picture clearly before any money changes hands. If a technician is recommending full replacement without documented evidence of why repair is inadequate, ask to see the photos first.

Key Takeaways

• Duct repair and sealing in Johns Creek runs $350 to $1,200 for most homes; whole-system Aeroseal reaches $1,200 to $2,200.
• Johns Creek’s unconditioned attic systems and long cooling season make duct leakage more expensive here than in cooler markets.
• Homes built before 2000 – particularly in Medlock Bridge, Parsons Plantation, and Country Club of the South – are the most likely candidates for repair based on system age alone.
• Cleaning and sealing done together costs less than two separate visits and produces a better long-term result.
• Every CleanRun job includes a written price before work starts and a Documented Photo Record of every duct run before and after – both included as standard, not as upgrades.
• The 365-Day Done Right Promise backs every job in writing; if the work is not right, CleanRun makes it right.
• A Free Second Opinion on any written estimate from another company is available at no cost – call (470) 326-1926 to use it.

Get a Written Estimate for Your Johns Creek Home

If you want to know what duct repair or sealing will actually cost for your specific home in Johns Creek – not a range pulled from a national average, but a written number that reflects your system’s age, your attic layout, and what the camera finds – call CleanRun at (470) 326-1926. A live person answers every call. The estimate is free, it is written, and it does not change once you approve the scope. The 365-Day Done Right Promise covers every job we complete, and if the work is not right, we make it right – in writing, not at manager discretion.

Tomas Reyes and the CleanRun team have been documenting duct systems in Johns Creek since 2013. Every finding is photographed. Every price is written. Every job is backed. That is the standard, not the exception.

Pricing reflects the Johns Creek, GA market as of 2026. CleanRun Air Duct Cleaning Johns Creek offers free written estimates – call (470) 326-1926.

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