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

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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

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.

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Before & after – our own jobs

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How Much Does Duct Repair & Sealing Cost in Alpharetta?

Duct repair and sealing in Alpharetta, GA typically costs between $350 and $1,200 for a standard single-family home, with most jobs landing in the $450-$850 range depending on the extent of the damage and how accessible the ductwork is. Homes in Alpharetta’s older subdivisions – think pre-2005 construction in neighborhoods like Windward, Wills Park, and Old Milton – tend to fall toward the higher end because the duct runs are longer, the flex duct has had more time to sag and separate, and the attic conditions push technicians into awkward positions that add labor time. At CleanRun, every job begins with a written price before any panel comes off – that’s Haven Standard Clause 1, and it applies here the same way it applies on every job we’ve done since 2013.

Duct Repair & Sealing Cost Breakdown (2026)

Duct repair pricing isn’t one number – it’s a stack of line items that add up differently depending on what the camera finds inside your system. Here’s how the costs break down in the Alpharetta market as of 2026:

What Pushes the Number Up

The biggest cost driver isn’t the materials – it’s access. Alpharetta’s housing stock skews toward two-story construction with attic ductwork, and a July attic in Fulton County runs well over 130 degrees. That affects how long a technician can safely work up there, which means longer total job time and higher labor cost. Homes in Johns Creek-adjacent parts of Alpharetta near Haynes Bridge Road often have complex branching duct layouts because of the open floor plans that were popular in late-1990s and early-2000s construction – more elbows, more joints, more places for mastic to fail or flex duct to pull apart at the collar.

On the lower end of the range, you’re usually looking at a tight-construction newer home – say, a home built after 2015 in a community like The Manor or Echelon – where the ductwork is shorter, the attic is spray-foam conditioned, and the camera inspection finds one or two separated joints rather than a pattern of failure across the whole system.

A Note on the $79 Coupon Model

You’ll see ads for duct cleaning and sealing in Alpharetta that start at $79 or $99. That price covers neither repair nor sealing. It typically covers a shop-vac-style pass at the main registers, nothing more. CleanRun was built specifically as the answer to that model – written price before work starts, camera documentation of every duct run, and the 365-Day Done Right Promise backing every job in writing. The two services are not comparable, and the price gap reflects that.

What Affects Duct Repair & Sealing Pricing in Alpharetta

• Age and construction era of the home: Homes built before 2000 in Alpharetta’s established subdivisions – Windward, Northgate, Crabapple Chase – used flex duct that is now 25-plus years old. That duct degrades at the inner liner, sags at unsupported spans, and separates at collars and connections. A camera inspection in these homes almost always finds multiple failure points rather than one isolated problem, which moves the project from a single repair toward a system-level restoration.
• Attic access and working conditions: Unvented attics with blown insulation covering the duct runs add labor time – the technician has to trace and uncover each run before photographing it. Conditioned attics (common in newer Alpharetta builds with spray-foam insulation) are easier to work in but still require careful documentation at every connection point.
• Number of duct runs and system configuration: A 1,600-square-foot ranch-style home might have 8 duct runs. A 3,200-square-foot two-story in a Windward community might have 18 or more. The difference in scope is substantial – and so is the price.
• Type of repair required: Applying mastic sealant at a few joints is a different scope of work than replacing a 15-foot section of deteriorated flex duct, which is again different from Aeroseal injection across the whole system. CleanRun cameras document what’s actually there before quoting any of these options.
• Leakage rate and duct pressure testing results: When a system undergoes duct blaster testing before the job, the measured leakage rate determines how much sealing material and labor is needed. A system losing 30% of conditioned air through leaks requires a fundamentally different scope than one losing 8%.
• Local Georgia climate effects on materials: Alpharetta sits in a mixed-humid climate zone – hot, humid summers and moderately cold winters. That humidity cycling causes expansion and contraction in duct connections over time. Homes with crawlspace ductwork (less common in Alpharetta than in older Roswell or Marietta stock, but present) face additional moisture stress that accelerates sealant failure at joints.

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Signs Your Alpharetta Home May Need Duct Repair

Not every duct problem announces itself. Some of the clearest signals are subtle enough that homeowners in Alpharetta ignore them for years, attributing the symptoms to the home’s age or the Georgia climate rather than to the ductwork itself.

• Rooms that don’t cool to the set temperature even when the system runs for an extended time – especially second-floor bedrooms in Alpharetta’s two-story homes, which are typically furthest from the air handler
• A noticeable spike in Georgia Power bills between May and September that doesn’t correlate with a change in usage habits
• Dust accumulation on registers faster than usual, which can indicate conditioned air is pulling unconditioned attic air through a gap before it reaches the register
• A musty or stale smell from specific registers that doesn’t appear at others – often a sign of a disconnected run pulling from unconditioned space
• HVAC system cycling more frequently than expected, which happens when the system is working to compensate for air that never arrives at its destination

A camera-documented inspection is the only way to confirm what’s actually happening inside the system. At CleanRun, that inspection produces a photo record of every duct run – before any repair work starts – so the written price is based on documented findings, not an estimate shaped by what a technician saw from the attic hatch.

Duct Repair vs. Full Duct Replacement: Which Makes Sense in Alpharetta?

This is the question we hear most often from homeowners in Alpharetta who’ve received a repair quote and want to know whether they’re patching a system that should be replaced outright.

The answer depends on two things: the age of the ductwork and the scope of what the camera finds. A flex duct system installed in 1998 that shows multiple separated collars, significant inner liner degradation, and evidence of moisture at several joints is a candidate for full replacement – because each repair point fixed today sits alongside dozens of connections at similar risk. The math on piecemeal repairs over the next five years often exceeds replacement cost.

On the other hand, a 2008-vintage system with one or two disconnected runs and a plenum that needs resealing is a repair job. The ductwork still has serviceable life, and targeted repair with mastic or Aeroseal sealing is the right scope.

CleanRun puts both numbers in writing – the repair cost and the replacement cost – before any work begins. The goal is to give homeowners a documented basis for the decision, not to push the higher-revenue option. That’s what the H.A.V.E.N. Standard means in practice.

Full Duct Replacement Cost in Alpharetta (for reference)

A full duct system replacement for a 2,000-2,800 square foot home in Alpharetta typically runs $2,800 to $5,500, depending on the number of runs, duct sizing requirements, and attic conditions. This scope is handled in coordination with your HVAC contractor and is outside the typical repair-and-seal project – but it’s a number worth knowing when you’re evaluating whether repair is the right path.

How to Save on Duct Repair & Sealing in Alpharetta

There are real ways to reduce cost on a duct repair project in Alpharetta. There are also false economies that end up costing more. Here’s the honest breakdown:

Ways That Actually Save Money

• Get the inspection first, before committing to any scope: At CleanRun, the camera inspection comes with a documented photo record and a written price. That record is yours. If you want a second opinion, bring the written estimate to another company – or bring theirs to us. CleanRun offers a free second opinion on any written estimate. Knowing exactly what’s in the system before authorizing work is the single most effective way to avoid paying for repairs you don’t need.
• Bundle duct repair with duct cleaning when both are indicated: If the camera shows debris accumulation alongside connection failures – common in Alpharetta homes that haven’t had ductwork serviced since purchase – doing both at the same visit reduces labor cost because the system is already opened and documented. Combining the two services typically saves $150-$300 compared to scheduling them separately.
• Address duct issues before HVAC replacement: If you’re planning to replace your air handler or condenser in the next 12 months, have the ductwork inspected and repaired first. A new HVAC system running through leaking ductwork operates below its rated efficiency from day one – and manufacturers can point to duct condition as a factor in disputes over warranty performance.
• Ask specifically what the written price includes: A quote that covers mastic sealing at three joints is a different scope than one that covers mastic sealing plus two flex duct section replacements plus a plenum reseal. The line items in a written quote let you compare actual scopes, not just headline numbers.

False Economies to Avoid

• DIY duct tape on duct connections: Standard hardware-store duct tape – the silver cloth kind – fails in attic temperature conditions within 12-24 months. It is not rated for HVAC duct use. The correct material is mastic sealant (a paintable, flexible compound) or UL 181-rated foil tape, applied by a technician who can confirm the joint is clean and properly seated before sealing. This is not a safety-critical repair in the same class as electrical or gas work, but it is a task where doing it wrong means doing it again.
• Accepting a phone quote without documentation: A verbal estimate for duct repair carries no obligation. A written price tied to documented findings is the only number that means anything when it comes time to compare what was promised against what was delivered.

For a written price specific to your home’s duct system, call CleanRun at (678) 679-7540. There’s no estimate fee, and the quote is in writing before any work starts.

How CleanRun Prices Duct Repair Jobs in Alpharetta

The pricing process at CleanRun follows the same sequence on every job, whether it’s a single-family home in the Crabapple district or a larger property near Avalon. It starts with a camera-documented inspection of the duct system – every run photographed, every connection point recorded. The written price is built from those findings, not from a floor plan estimate or a per-square-foot formula.

That approach matters because two homes with identical square footage in Alpharetta can have very different duct systems. A home on a slab with a single-story layout has a fundamentally simpler duct run configuration than a two-story home on a basement, even at the same total conditioned square footage. The only honest way to price the job is to see what’s actually there.

Tomas Reyes has led CleanRun since its founding in 2013, and the written-price-before-work-starts standard has held on every one of the 52,000-plus homes served in that time. Haven Standard Clause 1 isn’t a marketing statement – it’s the operating rule. Every customer receives a written quote before any work begins, and every job concludes with a documented photo record delivered as a standard job deliverable, not an optional add-on.

The equipment used on duct repair and sealing jobs includes tools from Rotobrush, Nikro, and Abatement Technologies for inspection and extraction work – brands technicians can look up independently to verify what’s being used before authorizing a job. These aren’t proprietary house-brand tools; they’re trade-recognized names with published specifications.

You can read more about the full scope of what’s included on our Duct Repair & Sealing in Alpharetta service page, or visit our home to see the full range of services CleanRun offers across the Alpharetta area.

FAQs – Duct Repair & Sealing Cost in Alpharetta

How much does duct sealing cost in Alpharetta, GA?

Duct sealing in Alpharetta typically costs $350 to $1,800 depending on the method and scope. Mastic sealant applied at individual joints runs $75-$150 per duct run. Aeroseal – a pressurized system that injects sealant particles throughout the duct interior to close leaks from the inside – costs $900-$1,800 for a whole-house application and is more appropriate when leakage is distributed across many small gaps rather than concentrated at a few visible joints. Call (678) 679-7540 for a written quote specific to your home’s system.

Is duct repair worth it, or should I replace the whole system?

For most Alpharetta homes built after 2000 with isolated duct damage, repair is worth it – targeted mastic sealing and flex duct section replacement costs $350-$1,200 versus $2,800-$5,500 for full replacement. For homes with pre-1998 flex duct showing widespread inner liner failure or moisture damage across multiple runs, full replacement often makes more financial sense over a 5-year horizon. CleanRun puts both costs in writing after the camera inspection, so you can make the comparison on documented numbers rather than a technician’s verbal recommendation. Call (678) 679-7540 to get those numbers in writing.

How long does duct repair take in a typical Alpharetta home?

A standard duct repair job on a 2,000-2,800 square foot home in Alpharetta runs 3 to 6 hours. Homes with attic access and multiple disconnected runs can take longer – especially in summer when attic working conditions limit continuous work time. Camera documentation of every duct run is included in that time estimate; it’s not a separate appointment. If the scope changes after the camera shows additional issues, the written price is updated before the additional work begins.

Can duct repair lower my energy bills in Alpharetta?

Yes, measurably. A duct system losing 25-30% of conditioned air through leaks – a common finding in Alpharetta homes from the 1995-2005 construction era – is moving heated or cooled air into the attic rather than into living space. Sealing those leaks reduces the load on the HVAC system, which shows up in lower runtime and lower monthly bills. The U.S. Department of Energy estimates that duct leakage accounts for 20-30% of total HVAC energy use in many homes. Actual savings vary by system and leakage rate, but a pre- and post-sealing pressure test documents the change in measurable terms. Call (678) 679-7540 for a free written estimate.

Does CleanRun provide a warranty on duct repair work in Alpharetta?

Every duct repair job CleanRun completes in Alpharetta is backed by the 365-Day Done Right Promise – a written guarantee, on every job, that if the work is not right, CleanRun makes it right. This is not a policy subject to manager approval or a grace period that expires in 30 days. It is a written commitment delivered as part of the standard job record, alongside the photo documentation of every duct run before and after. Tomas Reyes has backed every CleanRun job with this guarantee since 2013. Call (678) 679-7540 if you have a question about a specific job or scope.

What should I look for in a duct repair quote in Alpharetta?

A reliable duct repair quote should name the specific scope of work in writing – which runs are being repaired, what materials are being used, and how the completed work will be documented. It should come with a camera inspection that produces a photo record of the current condition, so you’re comparing like for like if you get a second opinion. A quote that arrives by phone without documented findings is a verbal estimate, not a price. At CleanRun, the written price under Haven Standard Clause 1 is always tied to documented inspection findings – never to a square-footage formula or a phone-call guess. Call (678) 679-7540 and we’ll put both numbers in writing.

Key Takeaways: Duct Repair & Sealing Costs in Alpharetta

• Most duct repair jobs in Alpharetta fall in the $450-$850 range for a single-family home; whole-house Aeroseal sealing runs $900-$1,800
• Homes built before 2005 – especially in Windward, Wills Park, and the Old Milton corridor – tend toward the higher end due to aging flex duct and longer duct runs
• The biggest pricing variable is access and attic conditions, not materials
• Repair beats replacement financially for most post-2000 homes; pre-1998 systems with widespread failure may favor replacement on a 5-year cost basis
• Get a written price tied to camera-documented findings – not a phone estimate or a per-square-foot formula
• The 365-Day Done Right Promise backs every CleanRun job in writing; every duct run is photographed before and after as a standard deliverable

Get a Written Duct Repair Estimate for Your Alpharetta Home

If you’re trying to understand what duct repair or sealing will actually cost for your specific home in Alpharetta, the most reliable answer starts with a camera inspection and a written price – not a range pulled from a national average. CleanRun serves Alpharetta and the surrounding Fulton County communities with written upfront pricing on every job, documented photo records of every duct run, and the 365-Day Done Right Promise backing the work after the truck leaves.

Tomas Reyes and the CleanRun team have completed that process on more than 52,000 homes since 2013. The estimate is free, the price is in writing before any work begins, and a live person answers when you call.

Call (678) 679-7540 to schedule your free written estimate. No phone quotes, no ballpark figures – just a documented inspection and a written price you can compare, keep, or use to get a second opinion.

Pricing reflects the Alpharetta, GA market as of 2026. Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Alpharetta, serving Alpharetta since 2013.

CleanRun Air Duct Cleaning Alpharetta offers free estimates – call (678) 679-7540.