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 Snellville
Duct sealing in Snellville typically runs $450 – $1,200 for a whole-home seal, depending on how much of the original 1980s – 2000s flex duct needs attention. Most jobs we book in Snellville are completed in a single visit, and we write the price down before any work starts. Call (361) 326-5060 for a free estimate.
We’ve been driving out to Snellville from our Atlanta dispatch office for years, and we know the subdivisions around Janmar, Knotts Landing, and Webb Gin House Road well. These neighborhoods were built fast during Gwinnett County’s boom years, and the flex duct in those attics is now old enough to vote. When a Snellville homeowner calls us about a musty smell, uneven temperatures, or power bills that keep climbing, the problem is rarely just dirty ducts. It’s usually leaks, disconnections, or crushed runs that cleaning alone won’t fix.
That’s where our Duct Sealing team comes in. We don’t guess at what’s wrong. We run a camera, show you what we find, and give you a written price to seal it properly.
Why Hollis Air Duct Cleaning Is Snellville’s Preferred Duct Sealing Company
Snellville homeowners know the difference between a crew that shows up squared away and one that doesn’t. We’re part of the Garrison Partners family, in business since 2004, and we operate under The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, and leave the site clean. Roy Castellanos leads our operation, and he expects every technician to follow The Garrison Code on every Snellville job.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday for someone to call you back.
Every repair we make is backed by our 365-Day Done Right Promise. If the work fails within a year, we come back and make it right at no charge, including a free second visit. That’s written down on every job, not something we mention casually at the door.
We serve Snellville and the surrounding Gwinnett County area from our Atlanta office, with crews that know local conditions: the heavy spring pollen, the humidity that hangs in attic spaces through October, and the red clay dust that finds its way into every gap in aging ductwork.
Duct Sealing Services in Snellville
Duct Sealing Services in Snellville address the leaks, gaps, and disconnected runs that waste conditioned air and pull contaminants into your HVAC system. In most Snellville homes built during the 1980s – 2000s subdivision boom, the original flex duct in the attic has degraded to the point where mastic sealing, collar repair, or partial replacement is the only way to restore proper airflow. A typical whole-home duct sealing job in Snellville runs $450 – $1,200, with smaller spot repairs starting around $250.
Leak Detection and Mastic Sealing
We pressurize your duct system and use smoke pencils or thermal imaging to find every leak, not just the obvious ones. Then we seal joints, plenum connections, and penetrations with mastic and reinforcing mesh. Mastic stays flexible for decades, unlike tape that dries and fails. In Snellville’s humid climate, this matters: a seal that holds keeps conditioned air inside your living space and stops the system from pulling hot, dusty attic air back through the returns.
Disconnected Run Repair
During duct sealing jobs in Snellville, we regularly find flex duct that has pulled completely free at the air handler plenum or a branch collar. The homeowner feels it as weak airflow to one room or a room that never reaches temperature. We reconnect the run, support it properly so it doesn’t sag again, and seal the joint. This is common in homes off Webb Gin House Road and around Janmar, where original ductwork has been flexing and settling for 20 – 30 years.
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 Snellville
Duct Insulation in Snellville protects repaired or replaced ductwork from the extreme temperature swings in unconditioned attics. In summer, an attic in Snellville can hit 140°F. Uninsulated or poorly insulated ducts lose 20 – 30% of their cooling before the air ever reaches your vents. Re-insulating exposed runs with proper R-8 fiberglass wrap or closed-cell foam typically adds $300 – $800 to a sealing job, depending on linear footage.
Condensation Control
Snellville’s humid subtropical climate means attic ducts sweat. When cold air moves through uninsulated flex duct in a 95°F attic, condensation forms on the outside, drips onto insulation, and creates the musty smell that prompts so many calls we get after heavy spring rains. Proper insulation stops the sweating. We see this pattern constantly in homes around Knotts Landing, where original insulation has compressed or fallen away from duct runs.
R-Value Upgrades for Older Systems
Builder-grade duct insulation from the 1990s was often R-4 or R-6, below current standards. We upgrade to R-8 where accessible, which reduces thermal loss and helps your HVAC system reach set temperatures without running continuously. Your blower motor works less hard. Your power bill reflects it.
Trusted Brands We Service in Snellville
We stock parts and materials from Honeywell, Aprilaire, and Abatement Technologies for Snellville jobs, which means faster turnaround and no waiting on shipping for standard repairs. Honeywell and Aprilaire filtration components integrate with the sealing work we do, so when we’re sealing your returns and supply plenum, we can also upgrade your media filter housing if it’s letting bypass air through a gap. Abatement Technologies supplies the containment and negative-air equipment we use to protect your home during any disturbance to the duct system. We don’t show up hoping we have what we need. Our Atlanta warehouse keeps Snellville jobs moving.
Common Duct Sealing Problems We See in Snellville Homes
- Disconnected flex duct at the plenum. In homes built during Snellville’s 1980s – 2000s boom, original ductwork has often pulled free at the air handler. The homeowner notices weak airflow to one end of the house, or a room that stays hot no matter how low the thermostat goes. We find the disconnected collar, reconnect it, and seal it with mastic and mesh so it holds.
- Crushed or sagging runs in attics. Flex duct needs proper support every 4 – 5 feet. In Snellville attics where original strapping has failed, ducts sag onto insulation or get compressed by storage boxes. A crushed 8-inch duct moves half the air it should. We re-support the run and replace damaged sections.
- Condensation dripping after spring rains. Snellville’s March – May rainy season saturates attic air. When that humid air hits cold duct surfaces, water drips onto insulation and drywall. The musty smell sends homeowners looking for duct cleaning, but the real fix is sealing the leaks that let attic air in, plus insulating the duct so it doesn’t sweat.
- Leaky returns pulling in red clay dust and pollen. Gaps in return ductwork in the attic don’t leak air out; they pull unfiltered attic air in. That air carries Georgia red clay dust, pollen, and mold spores straight to your blower and into your living space. Sealing the return plenum and joints stops this infiltration at the source.
Pricing for Duct Sealing in Snellville, GA
Whole-home duct sealing in Snellville typically costs $450 – $1,200. Spot repairs to single disconnected runs or leaky collars start around $250. Duct insulation upgrades run $300 – $800 depending on how many linear feet need covering. What moves the price: accessibility of your attic, how much of the original ductwork needs re-support or replacement, and whether we find multiple leak points during our initial pressure test.
We don’t quote per-vent or offer teaser coupon prices that balloon once we’re inside. We give one flat price per system, agreed in writing before any work starts. That price includes all materials, labor, and cleanup. If we find something unexpected, we stop and show you before proceeding. No surprises at the door.
Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Snellville
Our crews regularly work in Lilburn, Grayson, Conyers, and Redan, often on the same day as Snellville appointments. The same written pricing, same 365-Day Done Right Promise, same background-checked uniformed technicians apply in every community we serve. If you’re in Gwinnett County or eastern DeKalb and your ductwork needs attention, we cover your area.
Serving Snellville, GA - Our Local Coverage Area
We’re based in the Snellville 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 Snellville
Humidity keeps attic ducts sweating year-round, which degrades tape adhesives and causes mastic to work harder. We use mastic rated for wet conditions and verify seals under pressure before we leave. In Snellville, a proper seal has to survive 70% relative humidity in October and 95°F attic temperatures in July. Call (361) 326-5060 if you’re noticing musty smells or water stains near your vents.
Cleaning removes debris from inside the ducts, but it doesn’t fix leaks or disconnected runs. In Snellville’s 1980s – 2000s subdivisions, we regularly find original flex duct that has pulled free at the plenum or sagged to the point of crushing. No amount of cleaning restores airflow through a disconnected duct. Sealing repairs the physical integrity of the system. We inspect first and show you what we find before recommending either service.
Yes. Our sealing and cleaning protocols follow NADCA guidelines for containment, pressure testing, and post-job verification. We document static pressure before and after, and we show you the results. The Garrison Standard requires completing the job by the book, and NADCA’s book is the one we use for ductwork.
We seal with professional-grade mastic, mesh reinforcement, and metal-backed tape from suppliers including Abatement Technologies. For inspections, we use Rotobrush camera systems to see inside flex duct that would otherwise stay hidden. For cleaning before sealing, we deploy Nikro negative-air machines to maintain proper containment. These are the same tools commercial crews use, not hardware-store alternatives.
Yes, significantly, if your return ducts are leaking in the attic. Unsealed returns pull unfiltered attic air straight into your HVAC system, and that air carries Georgia red clay dust, spring pollen, and mold spores. Sealing those leaks stops the infiltration at the source. After sealing, many Snellville homeowners notice less dust settling on surfaces and reduced allergy symptoms during peak pollen season. Call (361) 326-5060 for a free inspection and written estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Snellville and the greater Atlanta metro since 2004.