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
Most duct repair calls we take from Kennesaw trace back to one root cause: original flex ductwork installed during Cobb County’s 1990s building boom that has now spent three decades cycling between 140°F+ attic heat and conditioned indoor air. Our crews are on the road to Kennesaw daily from our Atlanta dispatch office, and we typically schedule within 48 hours. If you’re in Legacy Park, Town Center, or the neighborhoods off Bells Ferry Road, we already know the attic layouts and the builder-grade duct runs you’re dealing with. Call (678) 904-9744 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Sandy Springs Is Kennesaw’s Preferred Duct Repair & Sealing Company
We’ve been documenting every duct run we touch since 2013. That practice matters in Kennesaw, where the photo record often reveals the gap between what homeowners assumed was happening and what the camera actually shows.
Our reputation here is built on one specific deliverable: a written price before work begins, every time, backed by Haven Standard Clause 1. No “call for a quote.” No per-vent bait-and-switch. Kennesaw customers receive the same documented photo record we deliver across all 52,000+ homes we’ve served, including before-and-after images of every duct run accessed during the repair.
Scheduling runs through our Atlanta office, and crews arrive uniformed, background-checked, and identified by name before they step out of the van, Haven Standard Clause 3: Verified Crews. The 365-Day Done Right Promise applies to every Kennesaw job in writing, not as a verbal assurance.
Our Duct Repair & Sealing Services in Kennesaw
Flex Duct Repair
Kennesaw’s 1990s subdivisions are full of fiberglass flex duct that has sagged, crushed, or separated at the boot connections after decades of thermal stress. We replace damaged flex runs with properly sized new ductwork, support it to prevent future sagging, and secure every connection with mechanical fasteners before sealing. In Legacy Park and similar communities, this is the most common repair we perform.
Mastic Sealant Application
Metal tape fails in Kennesaw attics. We apply water-based mastic sealant, a thick compound that remains flexible through Georgia’s temperature swings, at every joint, seam, and boot connection. The mastic is brushed on, cures to a rubberized finish, and holds pressure verification that tape alone cannot achieve. This is standard on every Duct Repair & Sealing job we complete.
Air Leak Repair
Disconnected duct sections in Kennesaw attics don’t leak, they hemorrhage, conditioned air. We pressurize the system, locate leaks with smoke pencil or blower-door testing, then repair and seal. The goal is measurable: supply and return ducts holding design pressure, verified before we leave.
Metal Duct Repair
Older Kennesaw homes with galvanized steel ductwork develop seam separation and corrosion at joints. We repair or replace damaged sections, seal with mastic, and insulate where the metal runs through unconditioned space. The work is photographed and pressure-tested.
Duct Insulation
Where flex or metal duct passes through Kennesaw’s 140°F+ attics, insulation breakdown accelerates energy loss. We replace degraded insulation with new R-6 or R-8 wrap, sealed at seams, to maintain thermal barrier integrity.
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 equipment roster includes Nikro negative-pressure extractors, Honeywell media air cleaners, and Aprilaire whole-home ventilation controls, equipment names customers can verify independently. We stock common flex duct diameters, mastic compounds, and mechanical fasteners locally, so Kennesaw repairs don’t wait on parts orders. When a Legacy Park homeowner needs a boot connection rebuilt or a crushed run replaced, the crew on site has what the job requires.
Common Duct Repair & Sealing Problems We See in Kennesaw Homes
- Separated boot connections in attic flex duct. Thermal cycling from 140°F+ summer attic heat causes the inner liner to pull away from the boot, sending conditioned air into the attic instead of the living space. We find this pattern far more often in Kennesaw’s 1990s subdivisions than in newer construction to the south.
- Sagging and crushed flex duct in tight attic runs. Builder-grade ductwork from the 1990s sags under its own weight, creating traps for pollen and lint that restrict airflow and force the blower motor to work harder. Kennesaw’s heavy foothills pollen load makes this worse.
- Shared dryer vent stacks in multi-family buildings. Lint accumulates at the transition from the unit to the shared stack, a leading fire risk that requires camera inspection and source removal beyond the trap. We service these in Kennesaw’s townhome communities.
- Insulation degradation on attic duct runs. Georgia’s extreme attic temperatures break down fiberglass insulation over 20+ years, exposing ductwork to thermal loss and condensation that accelerates material failure.
Pricing for Duct Repair & Sealing in Kennesaw, GA
A typical flex duct boot reconnection and mastic sealing in Kennesaw runs $280-$420 per run, depending on attic access and the extent of separation. Full flex duct replacement in a standard two-story colonial, common in Legacy Park, ranges $1,800-$3,200 for the complete system. Metal duct seam repair and resealing starts at $340-$580 for accessible sections. Shared dryer vent stack cleaning and inspection in multi-family units runs $220-$380 per unit served.
What moves the number: attic accessibility, the number of disconnected or damaged runs, whether pressure testing is required to verify the repair, and whether insulation replacement is needed. Every estimate is delivered in writing before work begins, Haven Standard Clause 1. No exceptions. Free second opinions on any competitor’s written estimate.
Call (678) 904-9744 for an exact quote, estimates are free.
We Also Serve Cities Near Kennesaw
Our crews work daily across Cobb and north Fulton counties. We regularly schedule Duct Repair & Sealing in Kennesaw alongside jobs in Marietta, Holly Springs, Smyrna, and Roswell. The same written pricing, documented photo record, and 365-Day Done Right Promise apply in every city we serve.
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
Original flex duct in Kennesaw’s 1990s subdivisions was builder-grade material rated for 25 years, and those three decades included thousands of thermal cycles between 140°F+ attic heat and 55°F conditioned air. The inner liner hardens and shrinks, pulling away from the metal boot. We reattach with mechanical fasteners and mastic sealant, then support the run to prevent sagging that accelerates the problem. Call (678) 904-9744 for an inspection and written estimate.
We camera-inspect the full stack from roof cap to unit connection, remove lint accumulation at transitions, and verify airflow meets code. The work is documented with photos of the stack interior before and after. Unit owners receive the photo record as part of the standard deliverable. Call (678) 904-9744 to schedule.
Kennesaw’s position near the foothills produces some of the highest pine and oak pollen loads in metro Atlanta, and that pollen infiltrates through separated duct boots and leaks, accelerating buildup inside the system. Sealing those entry points during repair reduces pollen loading and eases the burden on filtration equipment. Call (678) 904-9744 for a leak assessment.
Yes. We seal galvanized steel seams with mastic compound, replace corroded sections with new metal or transition to flex where appropriate, and insulate runs through unconditioned space. Pressure testing verifies seal integrity before we leave. Call (678) 904-9744 for a written quote.
Our crews operate Nikro negative-pressure extraction systems, Honeywell air quality components, and Aprilaire ventilation controls, professional-grade equipment customers can research independently. We also use Abatement Technologies HEPA filtration and Guardsman protective materials on every job. Call (678) 904-9744 with specific equipment questions.
At a two-story colonial in Legacy Park, our tech used camera inspection to find a separated flex duct boot above the master bedroom that had been blowing conditioned air straight into the 140°F attic for years. We reconnected the run, applied mastic sealant at every joint, and verified with a blower-door test that supply and return ducts were holding pressure. Our customer immediately noticed better airflow and lower utility bills.
Kennesaw’s rapid residential expansion through the late 1980s and 1990s, driven by Cobb County’s suburban boom, produced dense subdivisions packed with builder-grade flexible ductwork now 25-35 years old, well past its functional lifespan. Compounding this, Kennesaw’s position at the edge of the foothills near the heavily forested Kennesaw Mountain Battlefield creates some of the highest pine and oak pollen loads in the Atlanta metro, and that pollen infiltrates these aging, often-sagging flex-duct systems season after season. The result is a specific repair profile we see repeatedly: disconnected boots, crushed runs, and debris traps that restrict airflow while the blower motor compensates. Camera inspection, mastic sealing, and pressure verification are the methods that solve it.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Sandy Springs, serving Kennesaw since 2013.