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 Southlake
Duct sealing in Southlake typically runs $450 – $1,200 per system depending on home size and access, and most jobs are completed in a single visit. We’re the Duct Sealing team from Hollis Air Duct Fort Worth, and we work in Southlake’s neighborhoods every week. If your new custom home still has construction dust blowing through the registers, or your upstairs runs five degrees warmer than downstairs in August, the answer is often a duct leak. Call (682) 255-2572 and we’ll give you a written price before any work starts.
Why Hollis Air Duct Fort Worth Is Southlake’s Preferred Duct Sealing Company
Southlake homeowners call us because we treat the job the way they’d treat their own house. Our technicians arrive in uniform, inside the quoted window, and they’re background-checked before they ever set foot on your driveway. The price we quote on the phone or at the door is the price on the invoice. No add-ons once the ladder goes up. No “we found something else” surprises. That’s The Garrison Standard, and it’s written into every job we do in Southlake.
Roy Castellanos, who leads our team, will tell you the same thing: a duct system in a 5,000-square-foot Southlake custom home is a lot more complex than a 1,800-square-foot tract house in Euless. Multiple zones, long flex runs through hot attics, dampers, high-MERV filtration. We know where the leaks hide in these larger systems, and we know how to seal them so the fix holds through a Texas summer. Our customers in Southlake keep calling back because the first visit actually solved the problem. And every job is covered by the 365-Day Done Right Promise in writing.
Styles & brands we work with
Duct Sealing Services in Southlake
Duct Sealing Services in Southlake address a problem that’s especially common in this city’s newer construction: gaps in the ductwork that let conditioned air escape into attics and wall cavities before it ever reaches your living room. When we seal ducts, we’re restoring the system to the tightness it should have had from day one. For Southlake homeowners, that means rooms actually reach the temperature on the thermostat, electric bills stop climbing, and the air coming out of the registers is the air you paid to cool.
A full duct sealing job in Southlake typically costs between $450 and $1,200 per system, depending on how many zones you have and how accessible the ductwork is. Mastic sealing on exposed plenums runs lower; chasing leaks in flex duct buried under attic insulation runs higher. We’ll tell you the number before we touch anything.
Leak Detection and Mastic Sealing
Before we seal anything, we find the leaks. That means a camera inspection through the supply and return runs, pressure readings at the air handler, and a visual check of every accessible joint, boot, and plenum connection. In Southlake homes with two or three systems, we inspect each one separately. Leaks at the plenum where the ducts meet the air handler are the most common, and also the most expensive to ignore.
Aeroseal Repair and Reapplication
Some Southlake builders used Aeroseal as a shortcut during construction. When it’s applied properly, it works. When it’s rushed, it leaves gaps at registers and boot connections that open up within a year or two. We’ll tell you honestly whether your existing sealant is holding. If it isn’t, we remove the failed material and apply mastic sealant that’s rated for the temperature swings your attic sees every July.
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 Southlake
Duct Insulation in Southlake matters because your attic hits 130 degrees in summer, and uninsulated or poorly wrapped ducts sitting in that heat lose their cooling before it reaches a single room. We regularly find flex duct with torn outer jackets, missing vapor barriers, or insulation that’s been trampled flat by cable installers and pest control crews. The fix is straightforward: strip the damaged wrap, seal the duct, and re-insulate with the correct R-value for North Texas.
Expect to pay $300 – $800 for duct insulation work on a typical Southlake system, depending on how much of the run is exposed and whether we’re re-wrapping existing duct or replacing collapsed flex sections. If your plenum needs re-insulating, that’s usually on the lower end since it’s a single accessible surface. Attic runs with tight clearances cost more because of the time involved.
Plenum Re-Insulation
The plenum is the metal box where your air handler connects to the rest of the duct system. In Southlake homes, we see plenums sweating in the attic because the original insulation was never sealed properly. That moisture leads to rust, mold, and musty smells. We re-insulate plenums with closed-cell material and seal every seam so condensation stops forming.
Flex Duct Repair and Replacement
Southlake’s newer homes have extensive flex duct runs through the attic, and that duct has a service life. When the inner liner tears or the outer jacket rips, the duct leaks air. We’ll patch where feasible and replace where the damage is beyond repair. Either way, you get a sealed, insulated run that delivers the airflow your system was designed for.
Trusted Brands We Service in Southlake
We work on every major residential HVAC setup in Southlake, and we stock parts for the systems we see most often. That includes filtration products from Aprilaire, which many Southlake custom homes were built with, and sealing materials designed to work with equipment from Rotobrush and Abatement Technologies. Because we carry these parts on our trucks, we’re usually able to complete a duct sealing or insulation job the same day we start it. No waiting on a shipment before your system gets tight again.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Southlake Homes
- Construction dust trapped in new ducts. Builders in Southlake’s newer subdivisions sometimes run the HVAC before drywall is finished, which pulls fine white dust into the supply and return lines. Sealing alone won’t remove it; the ducts need agitation and negative-air extraction first, then sealing at the boots and plenum.
- Mastic failing on flex duct in hot attics. Southlake attics regularly exceed 125 degrees in August. Cheap mastic applied during construction cracks and peels within a few years, reopening the same leaks. We use sealant rated for sustained high-heat exposure.
- Renovation crews breaking existing seals. Southlake’s frequent remodels mean contractors moving through attics, stepping on ducts, and disconnecting runs to run new electrical or plumbing. The seal that was fine before the remodel is often gone after. We see this constantly in neighborhoods like Estes Park and Clariden Ranch.
- Rarely used rooms smelling musty. Guest suites and media rooms that sit closed up for months develop a stale odor. In many Southlake homes, it’s not the carpet or the furniture; it’s gaps in the ductwork pulling attic air into the return path. Sealing stops that infiltration.
Pricing for Duct Sealing in Southlake, TX
Here’s what Southlake homeowners should expect to pay. A single-system duct sealing job on an average 3,000-square-foot home runs $450 – $700. Bigger homes with two or three zones and multiple air handlers run $800 – $1,200. Adding insulation work typically adds $300 – $800 depending on the condition of the existing wrap. The variables are real: how many systems, how long the attic runs are, how much of the duct is accessible. But those variables go into a written quote you approve before work starts. Call (682) 255-2572 for a free estimate on your Southlake home.
We Also Serve Cities Near Southlake
Our crews handle duct sealing and insulation work throughout the corridor, including Duct Sealing in Southlake and the surrounding communities of Colleyville, Bedford, Euless, and Haltom City. If you’re in one of those cities, the same pricing structure and 365-Day Done Right Promise apply. Scheduling is coordinated from our Dallas-Fort Worth office.
Serving Southlake, TX - Our Local Coverage Area
We’re based in the Southlake 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 Southlake
A passed city inspection doesn’t mean the ducts are tight. Inspectors verify that the system meets code minimums, but they don’t run a full leak test on every run. We regularly find gaps at register boots and plenum connections in Southlake homes that closed on the sale within the last two years. The builder’s HVAC crew was fast, not thorough. The fix is usually a few hundred dollars, and it pays for itself within a summer or two of lower electric bills. Call us for an inspection; the quote is free.
Often yes. When a room sits closed up, any air the HVAC moves through it picks up whatever is in the ducts serving that zone. If those ducts have gaps pulling air from the attic, the room will smell like the attic, which in Southlake means hot, humid, and slightly stale. Sealing the return side of that zone stops attic air from entering the system. In homes where the smell persists, we add a duct cleaning step to remove whatever has already collected. Either way, we’ll show you the camera footage so you know what we found before we fix it.
Yes, and this is one of the most common reasons we’re called to Southlake in July and August. When conditioned air leaks into the attic, your system has to run longer to satisfy the thermostat. We’ve sealed systems where 20 to 30 percent of the airflow was bypassing the living space entirely, which directly translates to longer compressor run times and higher bills. Sealing the leaks means the system runs less, not harder, to keep the same temperature. The savings are real and measurable on your next few utility bills.
We don’t guess. We start with a camera inspection of each zone’s supply and return runs, then check static pressure at each air handler, then visually inspect every accessible joint, boot, and plenum. In larger Southlake homes with three or four systems, we’ll map each one separately and mark exactly where the leaks are before we seal. You’ll see the same camera footage we do. If we can’t access a section of duct in the attic, we’ll tell you that up front and explain what it would take to reach it.
Always ask for it before drywall. Once the walls are up, access to the duct runs behind them is gone, which means leaks in those sections can only be addressed from inside the duct using methods like Aeroseal, which is less durable than a proper mastic application at the joint. Many Southlake builders will agree to sealing if you ask during the framing phase, and some HOAs in the city expect it as part of the energy efficiency documentation. If your home is already finished, we can still seal everything accessible, and that covers the vast majority of real-world leakage.
Written by Roy Castellanos, Owner at Hollis Air Duct Fort Worth, serving Southlake and the surrounding area.