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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AfterFast, Reliable Duct Repair & Sealing Across Kennesaw
Duct repair and sealing in Kennesaw typically costs $280-$850 for most homes, with flex duct replacement running higher when original 1990s runs have degraded beyond sealing. We’re familiar with the subdivisions off Barrett Parkway, the Legacy Park loop, and the Shiloh Hills area - neighborhoods where crews from our Atlanta office respond the same week, often within 48 hours of your call. Kennesaw’s housing stock has a specific problem: thousands of homes built during the 1990s and early 2000s still carry their original flex ductwork, now sagging and leaking in attics that hit 140°F every July. Our Duct Repair & Sealing team treats these as repair jobs first, not replacement sales, and every visit starts with a written price before we touch a single panel. Call (470) 495-9370.
Why CleanRun Air Duct Cleaning Atlanta Is Kennesaw’s Preferred Duct Repair & Sealing Company
We’ve been driving to Kennesaw since 2013, and the pattern is consistent. The 1990s tract homes east of Kennesaw Mountain - Legacy Park, Shiloh Hills, the Barrett Parkway corridor - were built fast with flex duct hung on supports spaced too far apart. Crews see the same failures: sagging runs, pooled condensation, tape that dried and failed twenty years ago. Our technicians document everything with before-and-after photos of every duct run, delivered as part of the standard job record. That’s Haven Standard practice, not an upsell.
Kennesaw homeowners have left us reviews mentioning specifically that we showed them photos of disconnected boots and degraded liner before proposing work. We don’t quote over the phone; we inspect, photograph, and deliver a written scope with a fixed price. Haven Standard Clause 1: written price before any work starts, every time, no exceptions.
Scheduling is coordinated from our Atlanta office, but the crew that arrives at your Kennesaw home is the same crew that services this side of Cobb County weekly. They know the local pollen load, the summer humidity pattern, and the specific building practices that created the duct problems we’re now fixing.
Our Duct Repair & Sealing Services in Kennesaw
Duct Sealing with Mastic Sealant
Most Kennesaw homes we inspect have supply leaks at the plenum and return leaks at the air handler cabinet. Original construction used standard cloth-backed duct tape, which dries and fails in attic heat. We remove the old tape, clean the surfaces, and seal with water-based mastic sealant rated for the temperature swings these attics see. In a typical Legacy Park home, this reduces measured leakage from 25-35% to under 10%. The work is photographed, and the sealed joints are included in your documented photo record.
Flex Duct Repair
This is the service we perform most often in Kennesaw. Flex duct installed during the 1990s building boom was frequently undersupported, allowing it to sag between hangers. Georgia’s humid summer air condenses at these low points, creating mold hot spots that no filter change addresses. We re-support the run with proper strap spacing, replace degraded liner where the wire helix is exposed, and re-route runs that pool condensation. In Shiloh Hills and east of Kennesaw Mountain, we regularly find flex that has delaminated entirely, shedding fibers into the airstream. We repair what can be repaired and document what needs replacement.
Metal Duct Repair
Some Kennesaw homes, particularly custom builds from the early 2000s, have galvanized steel trunk lines with takeoff collars to flex branches. We repair separated seams, replace corroded sections, and seal with mastic rather than tape. Metal duct in Kennesaw attics suffers from condensation corrosion where insulation has slipped or was never properly applied. Our crew re-wraps with proper insulation and vapor barrier.
Duct Insulation
Kennesaw’s attic temperatures - routinely exceeding 140°F in July and August - make uninsulated or poorly insulated ductwork a significant efficiency loss. We install closed-cell insulation with proper vapor barrier on supply runs, paying particular attention to the plenum and first ten feet of trunk where heat gain is highest. For homes with original R-4 or R-6 flex, upgrading to properly insulated runs can drop supply air temperature by 8-12°F. This is not a theoretical benefit; we measure before and after with a digital thermometer and include the readings in your job record.
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 Kennesaw
Our trucks carry professional-grade equipment from Nikro, Honeywell, and Abatement Technologies - brands you can look up and verify before we arrive. For Kennesaw customers, this means we stock common flex duct diameters, mastic sealant, and insulation materials that match what was originally installed in 1990s and 2000s subdivisions. We don’t order parts after the fact and ask you to wait. The Rotobrush negative-pressure extraction systems we use for pre-repair cleaning are the same units specified by commercial HVAC contractors. When we quote a repair in Kennesaw, the parts are on the truck or available same-day from our Atlanta supply chain.
Common Duct Repair & Sealing Problems We See in Kennesaw Homes
- Sagging flex duct at unsupported low points. In Legacy Park and Shiloh Hills, we regularly find 1990s flex runs that have dropped 6-12 inches between original supports. These sags collect condensation from humid attic air, creating mold growth that produces the musty smell homeowners report even after standard cleaning.
- Delaminated flex liner shedding fibers. Attic temperatures above 140°F degrade the polymer liner on builder-grade flex duct over 20-30 years. The liner cracks, exposing the wire helix and releasing particulate into the airstream. We photograph this condition and show it to the homeowner before proposing repair or replacement.
- Failed tape seals at plenum and boots. Original construction used standard duct tape, not mastic. In Kennesaw’s heat, this tape dries, cracks, and falls off within 15-20 years. The result is supply leakage at the air handler and return leakage that pulls attic air into the system.
- Disconnected takeoffs feeding entire rooms. Thermal expansion and contraction in Kennesaw’s extreme attic cycles loosen collar connections. We’ve found bedrooms in Barrett Parkway-area homes receiving zero conditioned air because a flex takeoff has separated completely from the trunk.
Pricing for Duct Repair & Sealing in Kennesaw, GA
Here is what duct repair and sealing costs in the Kennesaw market, based on jobs we’ve completed in Legacy Park, Shiloh Hills, and the Barrett Parkway corridor:
| Service | Typical Range in Kennesaw |
|---|---|
| Mastic sealing of plenum, boots, and accessible joints (per system) | $280-$450 |
| Flex duct repair: re-support, patch, and seal (per run) | $180-$340 |
| Flex duct replacement (per run, including insulation) | $340-$620 |
| Metal duct repair: seam seal, patch, or section replacement | $260-$480 |
| Duct insulation upgrade (supply trunk, per linear foot) | $12-$18 |
| Full system inspection with documented photo record | $0 (included with any repair) |
These are whole-system prices, not per-vent teaser rates. Every quote is written and fixed before work begins - Haven Standard Clause 1. The final price depends on what the camera inspection reveals: a system with three sagging runs and failed plenum seals costs more than one with isolated tape failure. We don’t discover problems after quoting; we photograph them and show you before you decide. Free estimates. Call (470) 495-9370.
We Also Serve Cities Near Kennesaw
Our crews work the full corridor from Kennesaw through Marietta, Powder Springs, Smyrna, and Roswell. The same documented photo record, written pricing, and 365-Day Done Right Promise apply in every city we serve. Scheduling is coordinated from our Atlanta office, with route efficiency that keeps response times short across Cobb and north Fulton counties.
Serving Kennesaw, GA - Our Local Coverage Area
We’re based in the Kennesaw 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 Kennesaw
The musty smell comes from mold growing inside sagging flex duct where condensation pools, not from surface debris that cleaning removes. In Kennesaw’s 1990s subdivisions, undersupported flex runs create low points that collect moisture from humid attic air; standard cleaning doesn’t address the geometry that causes the condensation. We re-support the run, eliminate the sag, and then seal - that’s the fix. Call (470) 495-9370 for an inspection and written estimate.
We make this determination with a camera inspection that shows the actual condition of the liner and wire helix. If the liner is cracked but the helix is intact and the run can be properly re-supported, we repair. If the liner has delaminated extensively or the helix is corroded through, we replace and show you both options in writing before work starts. Every Kennesaw job includes this documented photo record as standard.
Attic heat in Kennesaw is a documented mechanical stress, not a sales narrative. Georgia Piedmont attics routinely exceed 140°F, and polymer flex liners begin thermal degradation at sustained temperatures above 160°F surface contact. The degradation is visible: cracking, delamination, and fiber release. We photograph this condition and include manufacturer temperature ratings in our job documentation so you can verify independently.
Yes. Most Kennesaw homes have accessible attics where the plenum, trunk lines, and flex takeoffs are reachable without drywall repair. We seal from the attic side and at the boots where ducts meet registers. If a run is inside a wall cavity and inaccessible, we note this in the written scope and discuss options. No work begins until you’ve seen the full scope and price in writing.
Yes, typically measurably. A 1990s Kennesaw home with original flex duct commonly leaks 25-35% of conditioned air into the attic before it reaches rooms. Sealing to under 10% leakage reduces runtime and can lower summer cooling costs. We don’t promise specific dollar savings; we promise documented before-and-after leakage testing and sealed joints you can inspect. The 365-Day Done Right Promise means if the work doesn’t perform as scoped, we make it right. Call (470) 495-9370.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Atlanta, serving Kennesaw since 2013.