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 Preston Hollow
Duct sealing in Preston Hollow typically runs $850 to $2,400 for a full system, depending on how many runs need work and whether the return side is part of the job. Most Preston Hollow homes we see were built between the 1950s and 1980s, and a lot of them still have original sheet metal and fiberglass duct runs. Those ducts leak. When a system leaks on the return side, it pulls attic dust, insulation, and pollen from the mature oaks and pecans lining streets like Strait Lane into your living space. We inspect first, show you what we found, and seal what actually needs sealing. Call (361) 309-6223 to get a written quote before any work starts.
Why Hollis Air Duct Dallas Is Preston Hollow’s Preferred Duct Sealing Company
We have spent a lot of time in Preston Hollow attics, and they are not like the attics in newer developments north of the city. These are long, complex duct systems running through original framing, often with multiple HVAC zones added during remodels over the decades. Our technicians are background-checked and uniformed, and they know what to expect when they climb into a Preston Hollow attic: original metal, fiberglass duct board, undersized returns, and the occasional crushed run behind a remodeled wall.
Hollis Air Duct Dallas is part of the Garrison Partners family, independently owned and operated under The Garrison Standard. That means a written price before work begins, arrival inside the quoted window, and the 365-Day Done Right Promise on every job. If the sealing fails within a year, we come back at no charge. No negotiation, no fine print. Roy Castellanos leads the team, and the standard he runs on is simple: show up when we said, price it before we touch it, and leave the site cleaner than we found it.
Styles & brands we work with
Air Duct Sealing in Preston Hollow
Air Duct Sealing in Preston Hollow is rarely a quick job, because the homes here are not quick homes. We are sealing runs that have been in place since Eisenhower or Carter was in office, and the failure points are usually hidden. The work involves finding every leak, gap, and failed joint in your duct system, then sealing it with mastic or appropriate mechanical fastening. In Preston Hollow, that often includes the return-air pathway, which is where most of the contamination actually enters.
Return-Side Sealing
The return side is where your system breathes in. In older Preston Hollow estates, original returns were sized for furnaces from the 1960s, not modern high-efficiency units. When an undersized return is attached to a stronger modern blower, it creates negative pressure. That negative pressure pulls dust, attic insulation, and pollen through every gap, crack, and open joint. Sealing the return side is the difference between clean ducts and ducts that re-contaminate within weeks.
Supply-Side Sealing
The supply side is where conditioned air leaves your system. Failed joints on supply runs push cooled or heated air into the attic instead of into living spaces. We see this constantly in Preston Hollow homes with original metal trunks. The fix is straightforward: locate the failed joints, clean the surface, and seal with mastic applied by hand. No tape shortcuts.
Duct Sealing Services in Preston Hollow
Duct Sealing Services in Preston Hollow come down to one thing: making the duct system do what it was supposed to do, without wasting conditioned air or pulling attic debris into the house. The homes here often have multiple HVAC systems, each with long, complex runs. Sealing one system properly takes time, and cutting corners on one branch run means the system still leaks. Our team works through the entire system, using camera inspection to find what is not visible from the access point.
Camera Inspection Before Sealing
We do not seal blind. A Rotobrush camera inspection shows us what is inside the duct before any mastic goes on. In Preston Hollow, that matters because runs are often long, angled, and hidden behind finished walls. We have found disconnected branch runs, crushed sections, and old fiberglass shedding into the airstream. You cannot seal what you cannot see, and the camera lets us see it all.
Whole-System Sealing and Verification
Once joints are sealed, we verify the work. That means checking static pressure at the air handler, walking every accessible run, and confirming the return side is no longer pulling attic air. A sealed system in a Preston Hollow home should hold the conditioned air you paid to condition, and it should stop ingesting whatever is in your attic. If something is still off, the 365-Day Done Right Promise covers it.
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.
Trusted Brands We Service in Preston Hollow
We work on systems built around equipment from Aprilaire and Honeywell filtration, and our sealing crews use Rotobrush and Nikro equipment for cleaning, inspection, and negative-air work. For Preston Hollow customers, that matters because these are professional-grade tools, not hardware-store gear. When we open a Honeywell media cabinet or work around an Aprilaire filter housing, we know what we are looking at and how to seal it without disrupting the filtration path. We carry mastic, fasteners, and replacement components suited to the older sheet metal and fiberglass duct board common in Preston Hollow homes.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Preston Hollow Homes
- Opened joints on original unlined metal ducts. The original sheet metal in homes off Walnut Hill and Inwood is decades old, and the joints were never designed for modern blower pressures. They open under negative pressure and pull attic air into the supply stream. Sealing only the visible runs misses these gaps entirely.
- Fiberglass duct board delaminating from 1970s remodels. Duct board age and fail. When the inner lining separates, glass fibers shed into the airstream. Surface sealing slows the shedding but does not stop it unless the entire inner surface is coated. We see this consistently in homes remodeled in the late 1970s and early 1980s.
- Disconnected or abandoned branch runs in multi-zone estates. When a Preston Hollow home gets a new zone added, old branch runs are often left in the attic, disconnected. They leak conditioned air into unconditioned space and pull particulates back through the return. Sealing only the active runs leaves the system perpetually dirty.
- Undersized original returns choking modern blowers. This is the big one for Preston Hollow. Original return ducts from the 1960s were not sized for high-efficiency systems installed in the 2010s. The negative pressure they create pulls dust and insulation through every gap. Sealing the return pathway is often the only fix that stops recontamination.
Pricing for Duct Sealing in Preston Hollow, TX
Whole-system duct sealing in Preston Hollow runs $850 to $2,400. Smaller jobs, like sealing a single return run or a plenum connection, start around $350 to $600. The factors that move the price are access difficulty, how many runs need work, whether the return side is involved, and how much of the system requires camera inspection before sealing. Older estates with long runs and multiple zones sit at the higher end. You will get a written price before any work starts, and that price does not move once our technician is inside. Estimates are free. Call (361) 309-6223 and we will schedule a walkthrough.
We Also Serve Cities Near Preston Hollow
Our crews regularly work in Dallas, Garland, Richardson, and Rowlett, including older neighborhoods where the same undersized-return and failed-joint problems show up. If you are in one of those areas, our Duct Sealing team is available for the same written-price, done-right standard. Duct Sealing in Preston Hollow remains our anchor for this part of the metro, but we are familiar with the whole corridor.
Serving Preston Hollow, TX - Our Local Coverage Area
We’re based in the Preston Hollow 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 Preston Hollow
The ducts get cleaned, and within months they are dirty again because the return side is pulling attic dust and tree pollen through gaps that have nothing to do with how clean the ducts are. Preston Hollow sits under a canopy of mature oaks and pecans, and that pollen settles in attics, not in the ducts themselves. Sealing the return pathway stops the system from ingesting it. If your ducts were cleaned and then recontaminated fast, the leak is the problem, not the cleaning. Call (361) 309-6223 and we will inspect the return side first.
Yes, if the smell is coming from the ducts. In a 1970s custom home, the usual culprit is fiberglass duct board delaminating or a failed plenum connection pulling attic air into the system. Musty odors in those homes typically mean the system is drawing air from somewhere it should not. Sealing the plenum connection at the air handler and the return runs stops that draw. We saw this in a 1960s estate off Strait Lane where a crushed return duct was pulling attic insulation through a four-foot gap. Sealing fixed the odor the homeowner assumed was coming from the ducts themselves. Call (361) 309-6223 for an inspection.
If the sheet metal is structurally intact, sealing is usually the right call. Sheet metal from the 1950s and 1960s is often still sound; the failure points are the joints, not the metal itself. If the metal is rusted through, crushed, or the seams are so far apart that mastic cannot bridge them, replacement is the honest recommendation. We inspect with a camera before recommending anything, and the written quote covers exactly what we found. Call (361) 309-6223 and we will show you what is inside.
Yes, and it is often the single biggest improvement you can make. Multi-system estates have more duct runs, more joints, more zones, and more places for air to leak. Sealing every system means every conditioned cubic foot stays in the house, and the returns stop pulling attic air. The cost is higher because the work is larger, but leaving one system unsealed means that system keeps wasting air and pulling in dust. We seal it right, left, and center, and the 365-Day Done Right Promise covers every run. Call (361) 309-6223 for a whole-estate walkthrough.
Yes, and in the right direction. A high-efficiency system attached to a leaking duct system operates like a stock car with the windows down. Sealed ducts mean the blower moves air through the coil and into the rooms, not into the attic. The system does not have to work as hard, and the return side stops pulling in attic air. In Preston Hollow homes with undersized original returns, sealing the return pathway can change the entire pressure balance of the system. The efficiency gains are real, and they show up on the bill. Call (361) 309-6223 for a written quote.
Written by Roy Castellanos, Owner at Hollis Air Duct Dallas, serving Preston Hollow with written-price duct sealing and the 365-Day Done Right Promise.