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 homes usually runs between $850 and $2,400 depending on system size, access, and how much of the original ductwork has failed. We get it: most Dunwoody houses were built in the 1970s and 80s, and the duct systems haven’t aged gracefully. Leaks at joints, degraded fiberglass ductboard, and condensation in unconditioned attics all bleed conditioned air into places you’re not living in. Our crews know Dunwoody’s housing stock well, and we’re already working in neighborhoods off Mount Vernon Road, near Dunwoody Village, and throughout the 30338 and 30346 zip codes. Call (762) 769-7145 and you’ll get a written price before any work starts.
Why Hollis Air Duct Alpharetta Is Dunwoody’s Preferred Duct Sealing Company
Dunwoody homeowners call us because we write the price down before we touch anything. That’s The Garrison Standard, and Roy Castellanos expects every technician to follow it on every job. No price that moves once the van is in the driveway. No surprise line items. Our Duct Sealing team works with background-checked, uniformed technicians who arrive inside the quoted window, do the work by the book, and leave the site clean.
The 365-Day Done Right Promise matters here. If a seal fails within a year, we come back at no charge. Not a negotiation, not a callback queue. It’s written on the job. For a Dunwoody homeowner who’s been burned before by a cheap bid that ballooned, that’s the difference between a guess and a guarantee.
We’re part of the Garrison Partners family, in business since 2004. Phones are answered by a live person around the clock, so when you call at 7 a.m. on a Saturday with condensation dripping from an attic duct, you get a person, not a voicemail loop.
Styles & brands we work with
Duct Insulation in Dunwoody
Duct Insulation for Dunwoody homes is often the missing piece when sealing alone doesn’t fix a musty smell or a hot bedroom. Many houses here, especially the 1970s-80s subdivisions off Chamblee Dunwoody Road and near Georgetown, have duct runs through unconditioned attic spaces. When the insulation wrap around those ducts is thin, torn, or water-damaged, the metal or fiberglass inside sweats in the summer. Sealing the joints helps, but if the duct isn’t insulated properly, condensation just moves to the next weak spot.
When Attic Runs Sweat
Hot, humid Dunwoody summers push moist outside air into attics that regularly reach 130 degrees or more. Cold air moving through uninsulated ducts causes surface condensation, and over a season that rots insulation and corrodes mastic seals. The fix is sealing plus insulation replacement, done together so one doesn’t undermine the other.
What It Costs
Duct insulation work in Dunwoody typically runs $400 to $1,100, depending on linear footage and whether we’re re-wrapping existing ducts or insulating new sealing work. The price is written before we start, and it doesn’t move.
HVAC Duct Sealing in Dunwoody
HVAC Duct Sealing in Dunwoody homes is the direct answer to air you’re paying to condition but never feel. In a typical Dunwoody house, anywhere from 20 to 30 percent of conditioned air escapes through failed joints, loose connections, and degraded ductboard before it ever reaches a register. We find these leaks with camera inspection, then seal them at the source.
Fiberglass Ductboard Repair
Original fiberglass ductboard from the 70s and 80s erodes at the joints. Dunwoody’s heavy pine and hardwood canopy means pollen and pine straw get pulled into those gaps and distributed through the house. Sealing here often involves reinforcing the ductboard itself, not just slapping mastic on a joint.
Mastic and Aerosol Sealing
We use professional-grade mastic and aerosol sealant systems from Abatement Technologies to close leaks that are too small to see. On a typical Dunwoody job, cutting leakage by half or more is realistic, which means better airflow, lower summer bills, and fewer hot and cold spots between rooms.
Trusted Brands We Service in Dunwoody
Dunwoody homes have all kinds of equipment, from original builder-grade systems to high-efficiency replacements installed in the last decade. We work on all of it, and we stock local parts for common Dunwoody applications: Honeywell filtration media, Aprilaire accessories, and Abatement Technologies sealing products. If you’ve got a Honeywell filter housing that’s not sealing right, or an Aprilaire system that’s pulling attic air through a failed joint, we have what we need to fix it same-visit in most cases. No waiting on a parts truck from another county. Call (762) 769-7145 and tell us what you’re running.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Dunwoody Homes
- Condensation in unconditioned attics. Ducts running through hot, humid attic spaces sweat, and that moisture corrodes mastic seals and soaks insulation. Homes off Mount Vernon Road and in the Georgetown area see this every late summer.
- Degraded fiberglass ductboard. Original 1970s-80s ductboard breaks down at the joints, releasing fibers and letting Dunwoody’s pollen and pine straw into the airstream. Sealing here often means reinforcing the board itself.
- Crawlspace duct runs with torn vapor barriers. Many Dunwoody homes have crawlspaces where humidity sits high all summer. Duct seals fail faster in those conditions, and pest activity around poorly sealed crawlspace ducts is common.
- Condo shared stack dryer vents. In Dunwoody’s multi-family buildings, dryer vents often share a stack. A poorly sealed connection can backdraft lint into a neighboring unit, which is a fire and air-quality concern nobody wants.
Pricing for Duct Sealing in Dunwoody, GA
A typical whole-system duct sealing job in Dunwoody runs $850 to $2,400. Smaller jobs, like sealing a single trunk line or one attic run, can start around $400. What moves the number: how much duct is accessible, whether we’re working in a crawlspace or an attic, and how many failed joints need mastic and reinforcement. Homes with original fiberglass ductboard often need more sealing work than newer flex-duct systems. You get a written price before anything starts. Call (762) 769-7145 for a free estimate, and we’ll give you real numbers for your house, not a vague range.
We Also Serve Cities Near Dunwoody
Our crews work throughout the north metro. In addition to Dunwoody, we regularly seal ducts in Alpharetta, Cumming, Suwanee, and Canton. Same written-price standard, same 365-Day Done Right Promise, no matter which side of the Perimeter you’re on.
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 off Mount Vernon Road often have duct runs through unconditioned attic spaces, and by late summer those attics have been hot and humid for months. Condensation forms on duct surfaces, corrodes the mastic seals, and you start smelling musty air through the registers. Late summer is when the damage becomes obvious. We seal the failed joints and replace damaged insulation so the condensation cycle stops. Call (762) 769-7145 for an assessment today.
Original fiberglass ductboard breaks down at the seams after 40-plus years, especially in Dunwoody’s humid climate. The boards lose their structural integrity, the foil facing peels, and joints open up. Sealing that system isn’t just about mastic on a leak. It’s about reinforcing the board and sometimes replacing sections. Homes in Dunwoody’s older subdivisions, like those near Dunwoody Village and along Chamblee Dunwoody Road, see this frequently. We inspect the ductboard with a camera before quoting so you know exactly what’s needed.
Yes. Condos and townhomes in Dunwoody with shared dryer vent stacks need careful access coordination, but we do this work regularly. The key is sealing the connection properly so lint can’t backdraft into a neighboring unit. We verify airflow after sealing, and the written price covers the entire job. If you’re in a condo association, we can provide the documentation your board may require. Call (762) 769-7145 and we’ll walk you through it.
It will help more than most people expect. When ducts leak, the negative pressure pulls attic air, crawlspace air, and whatever is in those spaces into your system. In Dunwoody, that’s pine straw, pollen from the dense hardwood and pine canopy, and dust from decaying insulation. Sealing the leaks stops that infiltration at the source. We’ve seen visible reductions in dust and pollen settling inside homes after sealing work, especially in heavily wooded neighborhoods near the Dunwoody Nature Center.
If the crawlspace is humid and the duct wrap is torn or missing, yes. Sealing without insulation leaves the ducts sweating in the summer, which just recreates the problem. Dunwoody’s humidity makes crawlspace ducts particularly vulnerable. We’ll tell you honestly if insulation is needed and quote it as a separate line item, so you see exactly what each part costs before anything starts. Call (762) 769-7145 for a straight answer on your system.
Written by Roy Castellanos, Owner at Hollis Air Duct Alpharetta, serving Dunwoody and the north metro Atlanta area.