Duct Sealing in Sandy Springs - Leakage Measured, Then Priced in Writing

Trusted Duct Sealing for Sandy Springs Homeowners

Duct sealing in Sandy Springs typically costs between $850 and $2,400 for a full system, depending on home size and how much of the ductwork is accessible. Most jobs finish in a single day. Leaky ducts quietly push 20 to 30 percent of the air you pay to heat and cool straight into your attic or crawlspace, which means higher utility bills and rooms that never quite reach the temperature on the thermostat. At Hollis Air Duct Sandy Springs, we seal those leaks with commercial-grade mastic and foil tape, then stand behind the work in writing for a full year, just as we do with our Roswell Duct Sealing customers. Roy Castellanos leads our crew, and he’s the person you’ll talk to when you call (229) 489-7780.

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Duct Insulation

Duct Insulation is the layer of material wrapped around ductwork to keep conditioned air at the right temperature while it travels from your HVAC unit to each room. In Sandy Springs, where summer attic temperatures routinely climb past 130 degrees, uninsulated or poorly insulated ducts force your AC to work against the heat the entire run. Hollis Air Duct Sandy Springs insulates exposed ductwork in attics and crawlspaces using fiberglass or reflective insulation rated for Georgia’s climate. Whole-system duct insulation in Sandy Springs runs $1,100 to $2,600 depending on the linear footage and access. The work is priced in writing before we start.

When Insulation Fails

Insulation on ducts in Sandy Springs fails in predictable ways. Raccoons and squirrels tear it in attics, condensation soaks it in crawlspaces, and older homes often have insulation that’s simply fallen away from the duct body. What’s left is a duct that sweats in summer, drips onto drywall, and loses conditioned air before it reaches the rooms you actually use.

What Hollis Does Differently

We don’t patch insulation. We remove compromised sections, inspect the duct underneath for leaks or rust, and then re-insulate to the R-value appropriate for the space. Every job includes a written inventory of what we found and what we replaced, so you can look at the list and the work, not take anyone’s word for it.

HVAC Duct Sealing

HVAC Duct Sealing is the process of closing every seam, joint, and connection in your duct system so that air moves only where it’s supposed to go. When you need it, you’ll usually notice it first as rooms that stay hot in July no matter how low you set the thermostat, or a utility bill that creeps up year after year. Hollis Air Duct Sandy Springs uses the same approach commercial buildings use: a negative-air test to measure leakage, then mastic and foil tape applied at every accessible seam. We bring that same rigor to our Duct Sealing in Smyrna. Sealing an average single-family system in Sandy Springs runs $850 to $1,900, and the price is written down before any tool comes off the truck.

Negative-Air Testing Explained

Before we seal anything, we can run a negative-air test on your system. That means we pressurize the ducts and measure exactly how much air is escaping, which tells us not just that there are leaks but where the worst ones are concentrated. It turns a guess into a measurement, and it tells us what to show you when the work is done.

The Mastic Standard

Hardware-store tape dries out and falls off inside a few Georgia summers. We use UL-rated duct sealing mastic, the same material required by commercial energy codes. It cures hard, flexes with the duct, and stays in place for decades. That’s why we can offer a written guarantee without crossing our fingers.

Duct Repair

Duct Repair is what’s needed when ductwork has been crushed, disconnected, punctured, or rusted to the point that sealing alone won’t fix the problem. It’s different from sealing because it requires replacing sections of duct rather than just closing gaps. Hollis Air Duct Sandy Springs repairs and replaces damaged flex duct and rigid metal duct throughout Sandy Springs, then seals the new connections the same way we’d seal a new installation. Most duct repair jobs run $450 to $1,800 depending on how many sections need replacement and how hard they are to reach.

Common Damage We Find

In Sandy Springs attics, we routinely find flex duct crushed by storage boxes, kinked around framing, or pulled loose from its registers. Crawlspaces bring their own problems: rusted metal ducts, separated joints, and ducts resting in standing water after heavy rain. Each one quietly bleeds conditioned air into spaces where it does nothing but cost you money.

Repair Then Seal

A repair that isn’t sealed is half a job. Whenever we replace a section of duct, the new connections get the same mastic treatment as everything else. That way the repair doesn’t just fix the visible problem; it makes the whole system tighter than it was before.

Air Duct Sealing

Air Duct Sealing is the umbrella term for the work that keeps air moving efficiently through your HVAC system, from the return grille all the way to the farthest bedroom register. If your home in Sandy Springs was built before 2015, there’s a good chance the ductwork was sealed with cloth tape at the factory and has been leaking ever since. Hollis Air Duct Sandy Springs seals both supply and return ducts, because a leaky return pulls hot attic air into the system and a leaky supply pushes cool air into the attic. It’s the same comprehensive approach we take with Duct Sealing in Holly Springs. Whole-home air duct sealing in Sandy Springs runs $850 to $2,400, priced in writing before we begin.

Supply Side vs Return Side

Most homeowners only think about the supply side: the ducts that blow air into your rooms. But the return side matters just as much. A leaky return duct in a Sandy Springs attic sucks in 130-degree air in August, which your AC then has to cool before it can do anything else. We seal both sides and show you the before-and-after numbers.

The Written Price Guarantee

The price we write down before starting is the price you pay. If we find additional leaks during the work that weren’t visible during the walkthrough, we’ll show you photos, explain what changed, and get your sign-off before any extra work happens. No surprise invoices, no pressure.

Duct Sealing Services

Duct Sealing Services cover everything from a single leaking register to a full-system seal with diagnostic testing. What separates a real service from a handyman with a caulk gun is the equipment, the testing, and the guarantee behind the work. Hollis Air Duct Sandy Springs uses professional-grade negative-air machines and sealing mastics from brands like Rotobrush and Abatement Technologies, the same tools you’d find on a commercial job site or on a Duct Sealing in Clarkston project. A typical single-family duct sealing service in Sandy Springs runs $850 to $2,400, and every job includes our 365-Day Done Right Promise in writing.

What The Garrison Code Means on This Job

Our technicians work under The Garrison Code, which is a list of operational expectations, not adjectives. Arrive inside the quoted window. Price in writing before work starts. Seal every accessible seam by the book. Leave the site cleaner than we found it. If any of that falls short, the 365-Day Done Right Promise brings us back at no charge.

Background-Checked Technicians

Every Hollis technician is background-checked and uniformed before they walk through your door. You’ll know who’s coming, what they’re there to do, and what it costs, all before the work begins. Roy Castellanos runs the crew, and he keeps it small on purpose: fewer people, more accountability.

Brands We Service

We work on duct systems built around equipment from every major HVAC brand, and we keep our sealing and repair methods brand-agnostic, because ductwork is ductwork. That said, our fleet includes negative-air machines from Rotobrush and filtration products from Abatement Technologies, which means the equipment we use to test and seal your ducts is the same professional-grade gear commercial contractors run.

When we install filtration after sealing, we recommend Aprilaire media filters where the system allows, because they fit most residential air handlers and do what they claim. Whether you have Rotobrush equipment in a newer build, an older system that’s never been sealed, or anything in between, we can diagnose it, seal it, and stand behind it in writing.

Signs You Need a Pro Right Now

• Rooms that never hit the temperature you set. If your bedroom is ten degrees warmer than your living room in July, the problem is rarely the unit. It’s usually a duct system leaking into the attic. Sealing restores balance room by room.
• A utility bill that keeps climbing while your habits haven’t changed. Georgia Power rates move, sure, but a steady upward trend usually means your system is working harder than it needs to. Leaks make your AC run longer for the same comfort.
• Dust accumulating right after you clean. Leaky return ducts in Sandy Springs attics pull in insulation fibers, pollen, and dust every time the fan runs. If your furniture is dusty three days after you wiped it down, the ductwork is pulling from somewhere it shouldn’t.
• Visible gaps, kinks, or hanging ducts in the attic. Take a flashlight up there. If you see flex duct sagging, pinched around framing, or pulled loose from a register boot, that’s air you’re paying for that’s not reaching your rooms.
• Whistling or rushing air sounds near vents. High static pressure from leaks and restrictions makes air move noisily through whatever openings remain. It’s not just annoying; it’s a symptom of a system out of balance.

Our Process, Step by Step

1. 1
   Walkthrough and measurement. We start by walking the accessible ductwork in your attic or crawlspace, measuring duct runs, and noting every seam, joint, and suspicious area. You get a written price for the whole job before any work begins.
2. 2
   Leak testing, where possible. On most Sandy Springs homes, we can run a negative-air test to quantify how much air is escaping. The number gives us a baseline, and it gives you a measure to hold us to when the work is done.
3. 3
   Sealing and repair. We seal every accessible seam and joint with UL-rated mastic and reinforced foil tape. Where ducts are crushed, disconnected, or rusted through, we replace the section first, then seal the new connections.
4. 4
   Verification and photos. Before we pack up, we show you photos of the work: before and after, seam by seam for the worst areas. You’re not taking our word for it. You’re looking at what was sealed.
5. 5
   Written documentation of the guarantee. Every job gets the 365-Day Done Right Promise in writing: if the sealing fails within a year, we return and fix it at no charge, including a free second visit. That’s not a verbal promise. It’s on the paperwork.

How Much Does Duct Sealing Cost in Sandy Springs?

Our Service Area Near Sandy Springs

Hollis Air Duct Sandy Springs serves Sandy Springs and the surrounding north metro area, including Dunwoody, Chamblee, Doraville, Roswell, Vinings, and North Druid Hills. We also run dedicated Duct Sealing in North Atlanta and Duct Sealing in Holly Springs operations for homeowners further out. If you’re in Stone Mountain, Belvedere Park, or Clarkston, call us; we regularly schedule those routes together to keep drive time down and prices honest. Most Sandy Springs appointments are scheduled within a few days, not a few weeks.

Frequently Asked Questions About Duct Sealing in Sandy Springs

Schedule Your Duct Sealing Service in Sandy Springs Today

Call (229) 489-7780 and you’ll talk to a live person, not a voicemail loop. We’ll schedule a free walkthrough of your ductwork, give you a written price for the whole system, and put the 365-Day Done Right Promise in writing before any work starts. Roy Castellanos and his crew serve Sandy Springs and the surrounding area with background-checked, uniformed technicians and equipment from Rotobrush, Abatement Technologies, and Aprilaire. Home.

Written by Roy Castellanos, Owner at Hollis Air Duct Sandy Springs, serving Sandy Springs, GA since 2004.