Fast, Reliable Duct Repair & Sealing Across Kennesaw
Duct repair and sealing in Kennesaw typically costs $180-$650 depending on whether we’re patching a single leak or replacing degraded flex duct runs, and most jobs are completed in a single visit. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to Kennesaw from our dispatch network for over 42 years. We know the territory: the acreage properties off Stilesboro Road, the subdivisions clustered around Barrett Parkway, the detached workshops with oversized doors that need conditioned air running through long attic or crawlspace duct runs. Our technicians carry mastic sealant, insulated flex duct, and the tools to handle both standard suburban homes and the heavier-duty demands of Kennesaw’s larger properties. Call (844) 685-6342 for a free estimate. We’ll give you one honest price before we start, and we back every job with our 90-Day Done Right Promise.
Why Bellows Air Duct & Vent Co. Is Kennesaw’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Cobb County on showing up when we say we will and leaving the job finished. Kennesaw homeowners call us because they’ve already dealt with contractors who changed the price at the door or disappeared when something went wrong. That doesn’t happen here.
Our background-checked, uniformed technicians know the local housing stock. They’ve replaced flex duct in the attics off Barrett Parkway where builder-grade materials from the 1990s have cooked for three decades. They’ve sealed crawlspace runs under acreage homes near 30152 where Georgia humidity works on every joint. They answer to a live person at our office, 24 hours a day. Not a voicemail. Not an app.
Every repair starts with a camera inspection of your ductwork. You see what we see. Then we quote upfront. The number on the phone is the number on the invoice. And if something’s not right, we make it right for 90 days with no paperwork and no arguing. That’s been our standard since 1984.
Our Duct Repair & Sealing Services in Kennesaw
Mastic Sealant Application
Tape dries out. In Kennesaw’s unconditioned attics, it dries out faster. We remove failed tape from your duct joints and apply professional-grade mastic sealant, the same product Abatement Technologies specifies for commercial jobs. Mastic stays flexible, seals completely, and won’t degrade under the 140°F temperatures your attic hits in July. For homes in 30144 and 30152, this is often the single most effective repair we can make.
Flex Duct Repair & Replacement
The flex duct in your Kennesaw home was probably installed during the 1980s or 1990s building boom. After 30-40 years of heat cycling, the plastic inner liner cracks, the insulation compresses, and the wire helix sags. We replace damaged runs with new, insulated flex duct rated for attic exposure, sealed with mastic at every joint. On a recent job in the Barrett Chase subdivision off Barrett Parkway, we found a 1990s flex duct branch to the master bedroom had a 3-foot-long gap where the tape had rotted away, pulling attic insulation into the return. We replaced the run with a mastic-sealed, insulated flex duct and installed a Honeywell UV air purifier to remediate the mold spores from years of moisture cycling.
Metal Duct Repair
Some older Kennesaw homes and most commercial buildings use galvanized sheet metal ductwork. We patch corrosion holes, reseal longitudinal seams, and replace damaged sections. Metal systems fail differently than flex, usually at joints and where condensation has pooled. Our camera inspection finds the exact location before we cut anything.
Duct Insulation
Uninsulated or degraded duct insulation in your attic wastes money every minute your system runs. In Kennesaw, where attics regularly exceed 140°F, cold supply air gains 10-15 degrees before it reaches your vents. We install fresh fiberglass or closed-cell insulation around repaired duct runs, paying special attention to long branches serving detached workshops where every degree of loss matters more.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
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.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Kennesaw
We carry Rotobrush inspection and cleaning equipment, stock Honeywell and Aprilaire air quality components, and use Abatement Technologies HEPA filtration on every job. For Kennesaw customers, this means we don’t order parts and make you wait. Our trucks are loaded for the work we do most often, and our suppliers in metro Atlanta keep us stocked for same-day repairs on everything else.
Common Duct Repair & Sealing Problems We See in Kennesaw Homes
- Tape-sealed flex duct joints from the 1990s dry out and separate. The builder-grade tape used during Cobb County’s construction surge has no adhesive left after three decades of attic heat. Conditioned air vents directly into your attic, and your system pulls Georgia red clay dust and insulation particles into the living space. Homeowners often notice uneven room temperatures for years before anyone checks the ducts.
- Flex duct runs in unconditioned attics degrade from sustained heat exposure. Attics in 30144 and 30152 regularly exceed 140°F in summer. That heat cracks plastic duct liners, causes sagging and partial collapse, and blocks airflow to distant rooms. The system runs longer, works harder, and still doesn’t cool evenly.
- Cyclical condensation in shoulder seasons promotes mold growth. Kennesaw’s long humid springs and falls (April-May, September-October) create moisture cycles inside attic ductwork when systems short-cycle. Mold colonizes fiberglass duct liner, especially in homes with detached workshops where extended duct runs worsen temperature differentials and condensation accumulation.
- Red clay dust infiltration through failed return ductwork. Georgia’s distinctive red clay generates fine particulate that enters through every gap in your return system. Once inside, it circulates continuously, coating vents and aggravating allergies. Sealing the returns properly stops the influx at its source.
Pricing for Duct Repair & Sealing in Kennesaw, GA
Here’s what duct repair and sealing costs in Kennesaw’s market:
| Service | Typical Range in Kennesaw |
|---|---|
| Single leak seal (mastic, accessible) | $180-$280 |
| Flex duct section replacement (per run) | $320-$480 |
| Multiple joint sealing (whole branch) | $450-$650 |
| Duct insulation wrap (per run) | $200-$350 |
| Crawlspace flex duct repair | $380-$550 |
Three factors move your price: accessibility (attic vs. crawlspace), material length needed, and whether we’re sealing existing duct or replacing degraded flex. We inspect with a camera first, show you the footage, then quote. No bait pricing. No changes at the door. Ask about our $50 off any repair over $250, or our $89 Seasonal Tune-Up if you’re not sure whether you need repair or just maintenance. Seniors and veterans receive a permanent 5% discount.
We Also Serve Cities Near Kennesaw
Our technicians regularly work in Kennesaw and the surrounding communities: Acworth, Marietta, Powder Springs, and Fair Oaks. If you’re on the edge of Cobb County wondering whether we cover your address, call (844) 685-6342. We probably do. Our Duct Repair & Sealing team routes daily throughout northwest metro Atlanta.
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
Tape fails in Kennesaw attics because sustained 140°F summer heat degrades the adhesive within 3-5 years, leaving you back where you started. Mastic sealant remains flexible and bonded for decades under the same conditions. We apply mastic to every joint we touch, and we warranty the work for 90 days. If your previous repair used tape, it was temporary from the day it was applied. Call (844) 685-6342 and we’ll show you the difference on camera before we start.
Long flex duct runs to detached workshops in Kennesaw acreage properties typically lose 15-25% of conditioned air through unsealed joints and degraded insulation before reaching the space. The remaining airflow is insufficient to maintain temperature, forcing your HVAC system to overwork. We replace or insulate those extended runs and seal with mastic to restore proper delivery. Most workshop duct repairs run $380-$550. Call for a free inspection.
Red clay dust enters through gaps in your return ductwork, not through your supply vents. We camera-inspect your returns, identify every leak point, and seal them with mastic. In Kennesaw’s 30144 and 30152 ZIP codes, we routinely find returns pulling attic air through failed tape joints. Once sealed, the dust infiltration stops. Estimates are free; call (844) 685-6342.
Yes. We repair and replace flex duct in crawlspaces throughout Kennesaw’s acreage properties, including those off Stilesboro Road and in the 30152 area. Crawlspace work costs $380-$550 depending on access difficulty and run length. Our technicians carry protective equipment for tight spaces and complete most crawlspace repairs in a single visit. Call to schedule.
Yes, especially in Kennesaw where attic temperatures regularly exceed 140°F. Uninsulated supply ducts lose 10-15 degrees of cooling before air reaches your vents. Proper insulation pays for itself in reduced runtime and more even temperatures. We typically recommend insulation as part of any flex duct replacement or major sealing job, at $200-$350 per run. Call (844) 685-6342 for an exact quote on your system.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Kennesaw since 1984.