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 Sealing Across Marietta
Duct sealing in Marietta typically runs $450 – $1,200 for a whole-home system, and most jobs are scheduled within a few business days. If your HVAC is cycling longer than it should, rooms stay unevenly heated, or your energy bills climbed after a humid Marietta summer, leaky ducts are the likely cause.
We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our Duct Sealing crews work Marietta regularly from our Atlanta dispatch office. We know the difference between a 1960s ranch off Whitlock Avenue with galvanized trunk lines and a 2014 build in the East Cobb subdivisions with flex duct sagging in a hot attic. That distinction matters because the sealing method, the materials, and what we find inside are completely different. Our technicians arrive uniformed, background-checked, and with a written price in hand before any work starts. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Marietta’s Preferred Duct Sealing Company
We’ve been in business since 2004, and our 365-Day Done Right Promise covers every duct sealing job we do in Marietta. If the seal fails or the airflow problem returns within a year, we come back and make it right at no charge, including a free second visit. That’s not a verbal assurance; it’s written on every proposal before we touch your system.
Our phones are answered by a live person 24 hours a day, seven days a week. No callback queues, no voicemail loops, no waiting until Monday morning to schedule. When you call (361) 326-5060, you talk to a human who can book your appointment and tell you what to expect.
We price in writing before work begins. The number on the page is the number at the door. No per-vent add-ons, no “we found another problem” upsells once the technician is inside. Our customers in Marietta tell us that’s the main reason they chose us over the coupon-mailer companies.
Our equipment includes professional-grade tools from Nikro and Abatement Technologies, the same negative-air machines and sealing mastics commercial crews use. We explain what each tool does and why we’re using it on your specific house. That’s The Garrison Standard.
Duct Repair in Marietta
Duct Repair in Marietta means fixing the physical damage that makes sealing impossible or pointless, from corroded galvanized steel in pre-1980 homes near the Marietta Square to torn flex duct in newer subdivisions. We see a lot of both. In older homes, the original metal trunk lines have pinhole corrosion from decades of humid attic air. In newer builds, the flexible duct gets punctured by trades walking through attics during construction or sags until it kinks or splits at the collar. Duct repair in Marietta typically costs $200 – $600 per damaged run, with whole-system repairs running $800 – $1,800 depending on accessibility and material.
When Repair Comes Before Sealing
You can’t seal what isn’t structurally sound. We inspect with a camera first. If we find a flex duct run in your attic that’s sagging below the insulation line, we’ll rehang it with proper supports before applying mastic. Sealing a collapsed duct just traps the leak inside a bag that can’t move air.
Metal Duct Corrosion Near the Square
Homes in the historic streetcar suburbs around the Marietta Square often have galvanized steel ducts from the 1950s – 70s that have rusted through at the seams. We cut out the damaged section, fabricate a replacement from sheet metal, and seal the joints with mastic and mesh tape. The repair lasts because we remove the corrosion, not just cover it.
Air Duct Sealing in Marietta
Air Duct Sealing in Marietta closes the gaps, disconnected joints, and porous seams that let conditioned air escape into your attic, crawl space, or wall cavities. In a typical Marietta home, we measure 15 – 30% airflow loss through these leaks before sealing. After proper sealing with mastic and mesh tape, that drops to under 5%. Air duct sealing in Marietta runs $450 – $1,200 for most whole-home systems, with smaller partial sealing jobs starting around $300.
The New-Build Debris Problem
We just wrapped a duct sealing job in the Sentinel Chase subdivision off Allgood Road, where a 2016-built home still had drywall dust and fiberglass insulation offcuts coating the supply and return ducts from the original build. Our tech ran a camera inspection and found the flex runs had sagged at two low points on the east-facing trunk, trapping the construction debris and pulling the static pressure on the blower motor. After source removal with agitation tools under negative pressure, we sealed the joints with mastic and mesh tape and the homeowner’s 14 SEER system finally hit its rated airflow.
Sealing the Whole System, Not Just the Vents
Many Marietta homeowners seal their supply registers with foam tape and think the job is done. The real leaks are usually at the air handler cabinet, the return plenum, and the flex duct collars in the attic. We seal the entire distribution path, including the connections you can’t reach without crawling through insulation.
Trusted Brands We Service in Marietta
We carry professional-grade sealing products from Honeywell, Aprilaire, and Abatement Technologies, plus Nikro negative-air equipment for jobs that need source removal before the seal goes on. For Marietta homeowners, that means no waiting on special orders. If your system needs a specific collar size, mastic type, or filtration upgrade after sealing, we stock it or can get it fast through our Atlanta supply chain. Our technicians are trained on the application specs for each brand, not just “compatible with most systems.” When we seal a Honeywell media cabinet into your return plenum, we do it to the manufacturer’s torque and gasket spec, not guesswork.
Common Duct Sealing Problems We See in Marietta Homes
- Failed builder mastic on flex joints. Mastic and mesh tape applied over dusty, unsealed flex joints at the builder’s original handover never bonds properly. The adhesive sits on drywall dust instead of duct surface, and the seal fails within one or two cooling seasons. We see this constantly in 2000s – 2010s subdivisions off Allgood Road and Shallowford Road.
- Sagging flex trapping debris and condensate. Flex duct runs sag at low points in Marietta’s humid east-side attics, collecting construction debris and condensate. Any seal applied before the sag is corrected just moves the leak to the next weak point. We rehang first, then seal.
- Partial sealing that misses the return path. Homeowners seal supply registers but leave the air handler cabinet and return plenum unsealed, so Marietta’s spring pollen still gets pulled in through the gap and recontaminates the system. A complete seal addresses both pressure sides.
- 1970s duct board absorbing humidity near the Square. In older homes around the Marietta Square, fiberglass duct board installed in the 1970s – 80s has absorbed years of humidity and pollen. The “musty attic smell” homeowners report often means replacement, not sealing. We test with a borescope and tell you straight which you need.
Pricing for Duct Sealing in Marietta, GA
Whole-home duct sealing in Marietta typically costs $450 – $1,200. Partial sealing of a single zone or problem area runs $300 – $550. Duct repair, when needed before sealing, adds $200 – $600 per damaged run. What moves the price: accessibility (crawl space vs. walk-in attic), extent of leaks found during pressure testing, whether we need to remove construction debris or biological buildup before sealing, and whether damaged duct needs replacement rather than sealing.
We give you one flat price per system, agreed in writing, before any work starts. No per-vent pricing. No “we found more leaks” add-ons at the door. You’ll see before-and-after photos of your own ducts, not stock images. Call (361) 326-5060 for a free estimate. Estimates include a full inspection with written findings.
We Also Serve Cities Near Marietta
Our Duct Sealing in Marietta crews also work in Smyrna, Kennesaw, Powder Springs, and Atlanta. Scheduling and dispatch run from our Atlanta office, with local technicians serving each area from stocked vans.
Serving Marietta, GA - Our Local Coverage Area
We’re based in the Marietta 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 About Duct Sealing in Marietta
Your ducts were likely never properly cleaned after construction, and the builder’s original mastic seal was applied over dusty joints that couldn’t bond. In east Marietta subdivisions, we regularly find drywall dust, fiberglass offcuts, and even fastener bags left in flex duct from the original build. The smell persists because your blower is recirculating that debris every time it cycles. We remove the debris with negative-air source removal, then seal with mastic that actually adheres to clean surfaces. Call (361) 326-5060 for an inspection.
Sealing helps with both, but the mechanism is different. Sealing stops warm, humid attic air from entering cool ducts and condensing, which is what feeds mold growth. It also stops your system from pulling musty attic air into your living space through return leaks. The energy savings come from keeping conditioned air inside the ducts where it belongs. In Marietta’s climate, the humidity control is often the bigger benefit than the utility savings. Call (361) 326-5060 and we’ll test whether your leaks are on the supply or return side.
A lint pathway is any gap or leak in your return ductwork that pulls air from spaces where lint, dust, or debris accumulate, like a laundry room, attic, or crawl space. In Marietta homes, we often find return leaks pulling fiberglass insulation particles and pollen into the system, which then distributes through the house. Sealing these pathways stops the contamination at the source. We identify them with a smoke pencil during our pressure test. Call (361) 326-5060 to schedule.
Builder-grade sealing in Marietta’s 2000s – 2010s subdivisions was often mastic slapped on dusty flex joints by crews working fast to pass inspection. The adhesive never contacted clean duct surface. Within a season or two of thermal expansion and the vibration of Marietta’s nearly year-round cooling load, those seals crack and peel. We remove the failed material, clean the joint, and apply mastic and mesh tape to bare, properly prepared surfaces. The difference in adhesion is visible. Call (361) 326-5060 for a free inspection.
Yes, completely different approach. Near the Square, we’re often working with galvanized steel trunk lines and fiberglass duct board from the 1960s – 80s. We use metal screws, sheet metal patches, and high-temperature mastic on steel; duct board often needs replacement if it has absorbed decades of humidity. In east-side subdivisions, we’re rehanging sagging flex duct, cleaning construction debris, and sealing with mastic and mesh tape at collars and junctions. The tools, materials, and sequence are different because the failure modes are different. We inspect first and tell you which system you have. Call (361) 326-5060.
Ready to stop losing conditioned air to your attic? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate on duct sealing in Marietta. We’ll inspect your system, show you what we find with our camera, and give you a written price before any work begins. Every job is backed by our 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Marietta and the greater Atlanta area since 2004.