Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Fast, Reliable Duct Sealing Across Dunwoody
Duct sealing in Dunwoody typically runs $450 – $1,400 depending on how many leaks we find and where they sit, and most jobs are finished in a single visit. If your upstairs never cools, your HVAC runs constantly, or certain rooms smell like attic, the problem is rarely the unit itself. It’s the ductwork. We’re Hollis Air Duct Sandy Springs, and our Duct Sealing crews work in Dunwoody neighborhoods every week. Call (229) 489-7780 for a written price before any work starts.
Key Takeaways for Dunwoody Homeowners
- Duct sealing in Dunwoody costs $450 – $1,400 for a typical single-family home, priced in writing before work begins.
- Homes in Dunwoody North and Kingsley built from 1970 – 1990 commonly have flex duct collapsed under attic insulation, a problem intensified by Georgia heat.
- Sealing almost always follows a full source-removal cleaning in Dunwoody because pine straw and leaf duff re-clog sealed systems otherwise.
- Every job carries the 365-Day Done Right Promise: if the seal fails within a year, we return at no charge.
Styles & brands we work with
Why Hollis Air Duct Sandy Springs Is Dunwoody’s Preferred Duct Sealing Company
We’ve worked in Dunwoody long enough to know the housing stock. Brick ranchers off Mount Vernon Road. Two-story colonials near Dunwoody Village. Split-levels in Kingsley with original 1980s flex duct. When we quote a sealing job, we know what we’re likely to find before the camera goes in because we’ve seen it in the house three streets over. That local repetition shortens diagnosis time and keeps your price honest.
Roy Castellanos leads our operation, and the standard he set is simple: arrive inside the quoted window, price the job in writing, do the work by the book, leave the site clean. Every technician is background-checked and uniformed, so the person who walks into your Dunwoody home is the person our office described on the phone. We answer calls with a live person 24/7. No callback queues, no waiting until Monday.
Our reviews from Dunwoody customers consistently mention two things: the written price matched the final invoice, and the crew respected the house. That’s the Garrison Standard, and it’s in writing on every job we do in Dunwoody.
Duct Sealing Services in Dunwoody
Duct Sealing Services in Dunwoody means finding where conditioned air leaves your system before it reaches a room, then closing those gaps with mastic or foil tape rated for HVAC use, not the gray duct tape that fails after a few Georgia summers. Most Dunwoody homes we see lose 15 – 30% of conditioned air through leaky joints, disconnected boots, and crushed flex runs. That’s money moving into your attic instead of your living room. In Dunwoody, this work typically runs $450 – $900 for moderate leakage, with whole-system sealing reaching $1,200 – $1,400 on larger homes.
Leak Detection and Testing
We inspect every accessible run with a camera before quoting. That lets us show you exactly where the leaks are, whether it’s a boot separated from the floor register or a seam that’s been open for decades. In Dunwoody’s older subdivisions, we find leaks at the supply boots most often, where decades of thermal expansion have worked the metal loose from the duct.
Mastic and Foil Tape Sealing
Once we locate the leaks, we seal them with code-approved mastic or UL-listed foil tape. Mastic is a paste that hardens into a permanent seal; foil tape has an acrylic adhesive that doesn’t dry out like cloth duct tape. We never use general-purpose duct tape on ductwork, because it’s not rated for the temperature swings in a Dunwoody attic.
What happens when you call
- 1
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.
Duct Insulation in Dunwoody
Duct Insulation in Dunwoody matters because your attic hits 130 – 150°F in July and August. Uninsulated or under-insulated duct runs lose cooling through the metal or flex wall before air ever reaches a register. We wrap runs with R-8 duct insulation after sealing, which keeps conditioned air at the right temperature from the air handler to the room. In Dunwoody, duct insulation alone typically runs $300 – $700 depending on linear footage, and it’s often paired with sealing on the same visit.
Attic Duct Wrapping
This is the most common insulation job in Dunwoody because most ductwork runs through attics, not basements. We cut insulation to length, wrap each run, and seal the seams with foil tape. The difference shows up fast: rooms that struggled in summer hold temperature within a day or two.
Crawlspace Duct Insulation
Some Dunwoody homes, especially brick ranchers with pier foundations, have ductwork in the crawlspace. Moist air from Georgia’s humid ground condenses on uninsulated ducts there, which leads to rust and microbial growth over time. Insulating those runs stops the condensation before it starts.
Trusted Brands We Service in Dunwoody
We work on duct systems from every major manufacturer installed in Dunwoody’s 1970s – 1990s housing stock, but the equipment we use matters more. Our crews run Rotobrush rotary brush systems for source-removal cleaning and Nikro negative-air machines to keep dust contained while we work. For filtration upgrades, we install products from Honeywell, Aprilaire, Abatement Technologies, and Guardsman. We stock common sealing and insulation materials for Dunwoody jobs, which means fewer return trips and faster completion. When you call, we’ll tell you what we plan to use and why it fits your house.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Dunwoody Homes
- Flex duct crushed under attic insulation. In Dunwoody North and Kingsley, we regularly find flex runs flattened beneath insulation that was blown in years after the original install. The restriction chokes airflow and opens gaps where the flex meets the boot.
- Cloth duct tape disintegrating on 1970s supply runs. Original installs used gray duct tape at every joint, and after 40 – 50 years of Georgia humidity, it’s brittle and peeling. Air pours out at those seams.
- Slab-embedded return ducts drawing crawlspace air. In 1970s and 1980s brick ranchers around Dunwoody, return ducts often run through the slab. Foundation shrinkage cracks let moist crawlspace air into the system, which shows up as musty smells from the registers.
- Boot-to-register gaps in second-floor ceilings. Thermal expansion in two-story Dunwoody homes pulls supply boots loose from the ceiling registers over time. Sealing those gaps keeps conditioned air in the room instead of the floor cavity.
Pricing for Duct Sealing in Dunwoody, GA
A typical duct sealing job in Dunwoody runs $450 – $900 for moderate leakage across 10 – 15 accessible supply runs. Whole-system sealing on a larger two-story home, especially one with multiple leaks found during a camera inspection, lands between $1,000 and $1,400. Duct insulation adds $300 – $700 depending on how many linear feet need wrapping. What moves the price: the number of leaks, whether the ductwork is accessible from the attic or buried under insulation, and whether we’re pairing sealing with a full source-removal cleaning. You get one written price before we start, and that number does not change at the door. Call (229) 489-7780 for a free estimate.
We Also Serve Cities Near Dunwoody
Our crews work throughout north metro Atlanta, including Dunwoody, Sandy Springs, Holly Springs, North Atlanta, and Stone Mountain. If you’re in one of these cities and seeing the same duct issues, the same written-price standard applies.
Serving Dunwoody, GA - Our Local Coverage Area
We’re based in the Dunwoody 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 Dunwoody
Homes built in Dunwoody between 1970 and 1990 used materials and methods that fail predictably after decades. Flex duct collapses under attic insulation, cloth duct tape dries and peels, and slab-embedded returns crack with foundation movement. Newer homes may have better materials, but Dunwoody’s older stock hasn’t been touched in most cases. The fix is sealing every accessible joint and boot. Call (229) 489-7780 for a written quote.
In Dunwoody, yes. Our mature tree canopy means attic and crawlspace runs fill with pine straw, leaf duff, and decades of dust. If you seal over that, the debris stays inside and keeps recirculating. We pair sealing with a full source-removal clean on almost every Dunwoody job, then seal the now-clean runs. That stops the leak path from re-clogging.
In Dunwoody North and Kingsley specifically, we find flex runs crushed under attic insulation, open seams on original 1970s metal supply runs, and boots pulled loose from second-floor registers. Last fall, our techs sealed a disconnected flex run in a two-story brick home in Dunwoody North where the original 1980s ducts had been crushed under a new layer of attic insulation. After camera inspection showed three separate 10 – 15% leakage points at the boots, we reconnected and mastic-sealed the joints, then wrapped the runs with R-8 duct insulation. The homeowner reported the upstairs finally holding 72°F on hot afternoons, and blower motor amp draw dropped by nearly 2 amps.
Yes. When slab-embedded return ducts crack, they pull moist crawlspace air into the system, which causes that musty smell from the registers. Sealing the accessible portions of those returns and addressing the foundation gap stops the moisture source. In Dunwoody’s humid climate, that’s often the difference between a house that smells stale and one that doesn’t. We’ll inspect first and tell you exactly what we find.
Sealed ducts reduce the load on your blower and compressor because the system isn’t pulling hot, humid attic air through leaks. Lower amp draw means less strain, less runtime, and fewer breakdowns over a Dunwoody summer. Homeowners who seal leaky ducts often report their units cycle less and hold temperature longer, which extends equipment life in a climate where HVAC runs hard from May through September.
Call Hollis Air Duct Sandy Springs for Duct Sealing in Dunwoody
If your Dunwoody home has hot rooms upstairs, constant HVAC runtime, or a musty smell when the system kicks on, we’ll find the leak and show you the fix on camera before we seal it. Written price before work starts. 365-Day Done Right Promise in writing. Background-checked, uniformed technicians at your door. Call (229) 489-7780 for a free estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Sandy Springs, serving Dunwoody and north metro Atlanta.