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 North Decatur
Duct sealing in North Decatur typically runs $800 – $2,400 per system depending on accessibility and the condition of your existing ductwork, and most jobs are scheduled within a few business days with a written price locked before we start. If you live off North Decatur Road, near Medlock Park, or in the tree-canopied blocks between Clairmont Road and Lawrenceville Highway, you’re likely in a home with either original 1950s sheet-metal ducts or a mix of old trunk lines and newer flexible runs. That combination is exactly why local experience matters. Our crews dispatch from the Atlanta office and know the crawlspace conditions, the common retrofit additions, and the static-pressure headaches that come with North Decatur’s split-era housing stock. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is North Decatur’s Preferred Duct Sealing Company
We’ve been working in North Decatur since 2004 as part of the Garrison Partners family, and our reputation here was built on showing up inside the window and pricing in writing before we touch anything. Roy Castellanos leads our operation, and The Garrison Standard he follows means no estimate balloons at the door and no technician leaves until the site is clean.
Our North Decatur customers come back because we document what we do. On a three-system home near South Peachtree Creek, we test static pressure before and after sealing, show the homeowner the numbers, and leave a written report with photos of sealed joints. That discipline is rare in this trade.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues. If you’re in North Decatur and need to schedule or ask a question, you talk to a human.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. That’s The Garrison Code, and it’s how we work in every North Decatur crawlspace.
Duct Sealing Services in North Decatur
Duct Sealing Services in North Decatur address the leaks, gaps, and failed joints in your HVAC ductwork that pull conditioned air into attics, crawlspaces, or wall cavities instead of delivering it to your rooms. In this market, we see two distinct housing types: mid-century ranches with original sheet-metal trunk lines, and 2000s-era custom builds with flexible ductwork and multi-zone systems. Both leak, but they leak differently, and sealing them properly requires different materials and testing protocols. A typical single-system duct sealing job in North Decatur runs $800 – $1,400, while homes with two or three systems range $1,600 – $2,400 depending on linear footage and crawlspace accessibility.
Sheet-Metal Joint Sealing with Mastic and Mesh
Original 1950s and 1960s sheet-metal ducts in North Decatur’s older ranches were assembled with snap-lock seams and drive cleats, not sealed joints. We apply water-based duct mastic reinforced with fiberglass mesh, which remains flexible through humidity cycles and won’t fail like foil tape in damp crawlspaces. This method is slower than taping, but it lasts.
Flexible Duct Connection Repair
Newer North Decatur homes use insulated flexible ductwork that can sag, kink, or pull loose at collars. We support sagging runs with proper straps, replace crushed sections, and seal connections with engineered clamps and mastic. The goal is restoring design airflow without restricting the duct.
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.
Duct Insulation in North Decatur
Duct Insulation in North Decatur is typically needed after sealing, or when existing insulation has degraded in humid crawlspaces or hot attics. Uninsulated or poorly insulated ducts lose 20 – 30% of conditioned air energy before it reaches your rooms, which in North Decatur’s humid subtropical climate means your system works harder for longer cooling seasons. We install formaldehyde-free fiberglass duct wrap or replace damaged flex duct with properly insulated new runs. A typical duct insulation job in North Decatur runs $600 – $1,200 per system depending on linear footage and whether we’re working in an accessible crawlspace or a tight attic. Homes near Medlock Park and the South Peachtree Creek corridor often need this most, since their shaded, damp crawlspaces accelerate insulation breakdown.
Crawlspace Moisture Barrier Coordination
In North Decatur’s older ranches, we regularly find duct insulation saturated from ground moisture. We coordinate with homeowners on vapor barrier improvements, then install insulation rated for below-grade use. The combination of sealed joints and dry insulation is what actually fixes the energy loss.
Attic Duct Insulation for Custom Builds
Newer North Decatur homes with attic duct runs often have thin original insulation compressed by summer heat. We add R-8 or higher wrap to supply trunks and replace any flex duct where the inner liner has cracked. This is especially important on dual-zone systems where the attic air handler serves a second floor.
Trusted Brands We Service in North Decatur
We stock parts and materials from Rotobrush, Nikro, and Abatement Technologies for our North Decatur jobs, and we carry filtration and sealing products from Honeywell, Aprilaire, and Guardsman. That means when we find a failed component during sealing, we don’t order and return. We fix it. For North Decatur homeowners, that translates to faster turnaround and fewer return trips. Our rotary brush systems and negative-air machines are the same tools commercial crews use, and we explain what each piece does while we’re in your home. No black boxes, no mystery steps.
Common Duct Sealing Problems We See in North Decatur Homes
- Undersized returns in expanded ranches. North Decatur’s mid-century ranches around Medlock Park were built with original sheet-metal trunk lines sized for a single system, so when a 2000s-era addition adds a second or third system, the old ducts become undersized returns that starve the new air handlers. Sealing those legacy joints with mastic and mesh, not tape, is what actually fixes static-pressure problems before they burn out a blower motor.
- Foil tape failure in damp crawlspaces. The dense tree canopy and humid microclimate near South Peachtree Creek and Medlock Park creates crawlspace conditions where standard foil tape adhesive breaks down within one heating season. We see reopened joints every spring in homes where tape was used instead of mastic and mesh.
- Flexible duct sagging in custom builds. North Decatur’s 2000s-era custom homes with long flexible duct runs often have sagging or kinked sections that restrict airflow and create turbulent leaks at connections. Sealing only the flexible runs while ignoring the undersized original return in the ranch core means the system still can’t move enough air and the blower motor overheats.
- Per-system isolation skipped on multi-zone homes. Some crews quote one flat price for a three-system North Decatur home without per-system isolation, so only the system the tech happens to test gets sealed and the other two keep leaking into the crawlspace. We test and document every system separately.
Pricing for Duct Sealing in North Decatur, GA
Honest pricing means ranges you can use before you call. In North Decatur’s market, a single-system duct sealing job typically runs $800 – $1,400. Two-system homes range $1,400 – $1,900. Three-system homes, common in the larger ranches with additions near Medlock Park and the Clairmont Road corridor, run $1,900 – $2,400. What moves the needle: crawlspace accessibility, the linear footage of ductwork, whether we’re sealing sheet-metal or flexible duct, and whether insulation replacement is needed alongside sealing. Every job gets a written price before work starts. No per-vent pricing, no add-ons at the door. We also provide before-and-after static-pressure readings and photos of sealed joints so you know the work happened. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near North Decatur
Our crews work throughout the metro area, including Duct Sealing in North Decatur and surrounding communities. We also schedule jobs in Atlanta, South Fulton, Sandy Springs, and Roswell. Dispatch and scheduling are coordinated from our Atlanta office, and we route crews to minimize wait times across the service area.
Serving North Decatur, GA - Our Local Coverage Area
We’re based in the North Decatur 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 North Decatur
Per-system pricing ensures every air handler and its associated ductwork gets tested, sealed, and documented separately. In North Decatur’s expanded ranches, we’ve found that crews who quote one flat price often test only the most accessible system and leave the others leaking into the crawlspace. We isolate each system, measure static pressure before and after, and provide written documentation for every unit. Call (361) 326-5060 for an exact quote on your home’s layout.
Duct sealing closes the leaky joints in your 1950s or 1960s sheet-metal trunk lines so your blower motor doesn’t pull unconditioned, humid crawlspace air into your living space. In Medlock Park’s damp microclimate, we use mastic and mesh rather than foil tape, since tape adhesive fails within one heating season here. The result is lower humidity indoors, more even temperatures, and less strain on your equipment. Call (361) 326-5060 for a free crawlspace assessment.
Yes. Flexible ductwork gets sealed with engineered clamps and mastic at collars, plus proper support straps to prevent future sagging. Sheet-metal joints get mastic and fiberglass mesh. The materials differ because the failure modes differ: flex duct pulls loose and crushes; sheet-metal gaps open from thermal expansion and tape degradation. We assess which type you have during our initial inspection and price accordingly. Call (361) 326-5060 to schedule.
We provide before-and-after static-pressure readings, photos of sealed joints, and a written report for every system. In North Decatur, where much of the ductwork is hidden in crawlspaces or attics, documentation is the only proof you have. Our 365-Day Done Right Promise covers every job: if the work fails within a year, we return and make it right at no charge, including a free second visit. The numbers don’t lie. Call (361) 326-5060 if you want to see what proper documentation looks like.
North Decatur’s dense tree cover creates a pollen and leaf-debris load that gets drawn into HVAC systems through leaky joints, especially in spring and fall. Sealing before peak pollen season, typically late February to early March, prevents your system from circulating outdoor allergens. Homes near the South Peachtree Creek trail and wooded sections of Medlock Park see the heaviest debris load and benefit most from pre-season sealing. Call (361) 326-5060 to schedule before the spring rush.
Ready to stop losing conditioned air to your crawlspace or attic? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate on Duct Sealing in North Decatur. We’ll show up inside the window, price it in writing before we start, and stand behind the work for a full year with our 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving North Decatur since 2004.