Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
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
AfterFast, Reliable Duct Repair & Sealing Across Cumming
Most duct repair calls we take in Cumming trace back to the same root cause: flex-duct runs installed during the 2000s building boom that have finally torn, disconnected, or started pulling attic debris into the living space. Duct sealing and repair in Cumming typically runs $280-$750 for standard residential work, with full flex-duct replacement on larger two-story homes reaching $1,200-$2,400. Our crews are dispatched from our Atlanta office and cover Cumming daily, including Windermere, Polo Golf & Country Club, and the full South Forsyth corridor. Call (470) 326-1926 and we’ll put a written price in your hand before any work starts.
Why CleanRun Air Duct Cleaning Johns Creek Is Cumming’s Preferred Duct Repair & Sealing Company
We’ve been driving to Cumming since 2013, and by now our technicians know the subdivision layouts well enough to spot which builder likely ran the original ductwork before we even open the attic hatch. Windermere, the Polo communities, the homes off Bethelview Road - we’ve documented photo records from hundreds of them. Cumming customers get the same Haven Standard Clause 1 written pricing, the same 365-Day Done Right Promise, and the same before-and-after photo deliverable on every job. Our crews are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews. Tomas Reyes established this practice when CleanRun opened, and it’s never been optional.
We don’t do urgency theatre. We do documented evidence. Every duct run is photographed. Every price is written. Every job is accountable.
Our Duct Repair & Sealing Services in Cumming
Duct Sealing with Mastic Sealant
Cumming’s production homes from the 2000-2015 era were built fast, and the flex-duct collars were often sealed with tape that degrades in Georgia attic heat. We apply mastic sealant, a thick, fiber-reinforced compound that remains flexible at temperature extremes, to every joint and collar we can access. In a typical Cumming two-story, we’ll seal 15-25 connection points per system. The result is measured: we run a static-pressure test before and after, and the homeowner sees the number drop. Mastic sealing on a standard Cumming home runs $280-$450.
Flex Duct Repair & Replacement
This is the service we perform most often in Cumming. Those long flex-duct runs in unconditioned Forsyth County attics sit in 140°F+ heat for months every summer. The liner cracks. The wire helix corrodes. The duct detaches at the collar and starts pulling fiberglass and red clay dust straight into the supply. We got a call from a two-story in Windermere where the upstairs bedrooms never got cold; camera inspection showed a 12-foot section of flex duct in the attic had separated at the collar and was pulling fiberglass insulation and red clay dust straight into the supply. We reconnected and mastic-sealed the joints, replaced the crushed run, and the second-floor static pressure dropped enough that the homeowner stopped using a window unit. Flex duct repair in Cumming typically runs $180-$420 per run; full replacement of multiple runs on a large home runs $800-$1,800.
Metal Duct Repair
Some Cumming homes, particularly earlier builds in the Polo Golf & Country Club area and certain custom homes off Kelly Mill Road, have galvanized steel trunk lines. These don’t tear like flex duct, but the seams can separate and the interior lining can corrode in high-humidity conditions. We repair separated seams with mastic and mechanical fasteners, and we replace corroded sections with new metal or transition to flex where appropriate. Metal duct repair in Cumming runs $320-$680 depending on accessibility and extent.
Duct Insulation & Vapor Barrier Restoration
When Lake Lanier humidity condenses inside supply ducts, the insulation wrap on the exterior can become saturated and fail. We replace degraded insulation with new R-6 or R-8 wrap with intact vapor barriers, sealed at every seam. This matters especially in Cumming’s lake-adjacent neighborhoods where humidity runs higher than in inland suburbs like Alpharetta. Insulation restoration on a standard system runs $450-$850.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in Cumming
Our equipment roster includes Rotobrush mechanical agitation systems, Abatement Technologies negative-pressure extractors, and Aprilaire media filters and whole-home dehumidifiers - brands any Cumming homeowner can look up and verify. We don’t use equipment we can’t name. When a Cumming home needs a component replacement, we source from these same manufacturer lines so the repair matches the existing system specifications. No generic substitutions, no “equivalent” parts we can’t document.
Common Duct Repair & Sealing Problems We See in Cumming Homes
- Flex duct liner torn from attic heat cycling. Georgia’s unconditioned attics hit 140°F+ regularly. In Cumming’s 15-20-year-old production homes, the inner liner of flex duct has often become brittle and cracked, especially at elbows and collars. The camera shows fiberglass particles collecting at the first bend.
- Disconnected joints pulling in attic debris. The same heat cycling loosens tape and zip-tie connections. We regularly find 6-inch gaps between duct sections in Cumming attics, pulling in loose-fill insulation and, in neighborhoods near active construction, fine red-clay dust that cakes the blower wheel.
- Lake Lanier humidity promoting mold on duct liners. Cumming’s proximity to the lake creates localized humidity measurably higher than inland suburbs. Condensation forms on cool supply ducts in summer, and the organic material in duct liner supports mold colonization that shows up as musty odor every time the AC cycles.
- Construction dust infiltration through loose return plenums. Active development throughout Forsyth County pushes red-clay dust into the air. In established Cumming neighborhoods abutting new builds, we find this dust packed into return plenums and filter housings in homes that have never been on a jobsite themselves.
Pricing for Duct Repair & Sealing in Cumming, GA
We publish ranges because Haven Standard Clause 1 requires a written price before any work starts. Here’s what duct repair and sealing costs in Cumming’s market:
- Mastic sealant application (standard residential system): $280-$450
- Flex duct repair (per run, reconnect/replace damaged section): $180-$420
- Flex duct replacement (multiple runs, large home): $800-$1,800
- Metal duct seam repair and section replacement: $320-$680
- Duct insulation/vapor barrier restoration: $450-$850
- Air leak detection and comprehensive sealing package: $550-$950
What moves the number: attic accessibility, number of zones, extent of damaged ductwork, and whether we need to replace register boots or plenum connections. Every estimate is free. We put the written price in your hand before a single panel comes off. Bring a competitor’s written estimate and we’ll provide a Free Second Opinion - our number next to theirs, no charge.
We Also Serve Cities Near Cumming
Our Duct Repair & Sealing in Cumming crews also work in Alpharetta, Duluth, Suwanee, and Holly Springs. Dispatch and scheduling are coordinated from our Atlanta office, with local crews serving each area daily. The same Haven Standard, same written pricing, same documented photo record applies in every zip code we cover.
Serving Cumming, GA - Our Local Coverage Area
We’re based in the Cumming area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Duct Repair & Sealing in Cumming
Disconnected or crushed flex-duct runs in the attic are the most common cause we find in Cumming two-stories. The long supply runs to second-floor bedrooms pass through 140°F+ attic space, and the flexible duct is prone to tearing, kinking, or pulling loose at collars. In Windermere and similar subdivisions, we routinely camera-inspect and find separated joints pulling attic air instead of conditioned air. The fix is reconnecting and mastic-sealing the joints, replacing damaged runs, and verifying with a static-pressure test. Call (470) 326-1926 for a free inspection - we’ll show you the camera footage before we quote any work.
Yes. Cumming’s lake-adjacent location creates humidity levels noticeably higher than drier inland suburbs like Alpharetta or Canton. That moisture condenses on cool supply duct surfaces in summer, saturating insulation wraps and promoting mold colonization on organic duct liner material. We see this in camera inspections as dark staining and musty odor that returns every cooling season. Proper sealing and insulation restoration with intact vapor barriers is the fix. Call (470) 326-1926 for a written estimate.
A 2008 Cumming home is at 16-17 years, which is typically when flex-duct liner in unconditioned attics begins showing its first failures. The original ductwork in homes from that era was designed for a 20-25 year lifespan under ideal conditions; Georgia attic heat is not ideal conditions. We recommend a camera inspection to assess liner condition, joint integrity, and debris load before committing to any service. The inspection is free, and you’ll see exactly what we see. Call (470) 326-1926 to schedule.
It’s fine clay dust from active construction throughout Forsyth County. The dust becomes airborne during grading and excavation, infiltrates through loose return plenums and poorly sealed filter housings, and deposits as a red-tinted cake on blower wheels and evaporator coils. We pull this material from established Cumming homes that have never been on a jobsite themselves. The long-term fix is sealing the return path and repairing any gaps in the plenum. Call (470) 326-1926 - we’ll document the source with a camera inspection.
Often, yes. If the flex-duct liner is intact and the wire helix is undamaged, mastic sealing of joints and collars, plus repair of minor tears with reinforced tape and mastic, can restore system integrity without full replacement. We make this determination with a camera inspection, not a guess. The homeowner sees the footage and gets a written price for both options before any work begins. Our Duct Repair & Sealing team will recommend replacement only when repair won’t last. Call (470) 326-1926 for a free inspection and written estimate.
Ready to see what’s actually inside your Cumming ductwork? Call (470) 326-1926. A live person answers, we’ll schedule a free inspection, and you’ll receive a written price before any work starts - plus a Documented Photo Record of every duct run, delivered as part of your standard job record. Every repair is backed by our 365-Day Done Right Promise, in writing, on every job.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Cumming and Forsyth County since 2013.