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 Houston
Duct sealing in Houston typically costs between $450 and $1,400 for a full system, depending on the number of leaks, duct length, and whether insulation replacement is needed. Most homes in Houston can be sealed in a single day, and the work is done by our Duct Sealing team using commercial mastic and foil-backed tape, not hardware-store caulk. Houston’s climate punishes leaky ducts harder than most cities: humidity finds every gap, and when your AC runs 2,800-plus hours a year, a 20% duct leak is a monthly utility bill you never stop paying. Call us at (713) 936-5800 for a written estimate before any work starts.
Why Hollis Air Duct Houston Is Houston’s Preferred Duct Sealing Company
Houston homeowners consistently tell us the same story about previous ductwork crews: they showed up late, quoted one number on the phone, then bumped the invoice after seeing the attic. That pattern is why our location runs by The Garrison Standard, which means one written price before work begins, a crew that arrives inside the quoted window, and a site left cleaner than they found it. We have been part of the Garrison Partners family since 2004, and Roy Castellanos leads our Houston team with a simple rule: every seam sealed, every collar checked, every duct re-supported, every time.
Being local to Houston means we know the failure points before we open a single register. Meyerland ranch homes built in the 1960s carry original galvanized ductwork that has shifted at the trunk connections. Sharpstown split-levels fight attic dust and fiberglass pull-through from separated returns. New Cypress flex-duct systems sag at the collars and sweat condensate into the insulation. That is not generic knowledge. That is what a Houston crew learns after hundreds of attics, crawlspaces, and pier-and-beam inspections.
Our techs are background-checked and uniformed. Our phones are answered by a live person, 24/7. And every job is covered by the 365-Day Done Right Promise: if a seal fails within a year, we return and fix it at no charge. That is a written guarantee, not a verbal one.
Styles & brands we work with
Duct Sealing Services in Houston
Duct Sealing Services in Houston means more than smearing mastic on a visible gap. It starts with locating every leak, and in this city, most of them are invisible from the register. Houston’s post-Harvey building stock often has hidden duct damage behind intact drywall. Silt-caked seams in Meyerland ranch homes, corroded plenum connections in older Sharpstown builds, and separated flex-duct collars in Cypress subdivisions all leak air, moisture, and particulates into the system without ever being visible during a walkthrough. We use camera inspection to find them. Then we seal them properly.
Trunk Line and Plenum Sealing
A trunk line leak is the most expensive leak a Houston home can have. When the main supply or return separates at the plenum, your AC is cooling the attic, not the living room. We seal these with commercial mastic and re-support the duct so the seal lasts through Houston’s humidity cycle and the foundation movement we see across clay-heavy soil.
Return-Side Sealing for Pier-and-Beam Homes
Houston’s pier-and-beam neighborhoods like parts of Katy and older west Houston subdivisions present a problem that slab homes do not: return ducts that pull crawlspace air directly into the system. If you only seal the supply side, the return keeps drawing moist, mold-laden air and everything re-contaminates within months. We seal both sides. That is not an upgrade; it is the only way the job works.
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 Houston
Duct Insulation in Houston serves two hard jobs: keeping the cool air cool as it travels through a 140-degree attic, and preventing condensation from forming on the outside of the duct where it passes through unconditioned space. In Houston’s humidity, uninsulated or under-insulated ducts sweat. That moisture saturates fiberglass insulation, drips onto drywall, and feeds the mold that homeowners smell but cannot locate. Re-insulating after sealing is standard on most of our Houston jobs, especially where flex duct has been installed with sagging collars that collect water.
Attic Duct Wrap and Replacement
In older Houston ranch homes, the original insulation around galvanized ductwork has often degraded into paper-thin remnants. We remove it, seal the metal underneath, and wrap with the appropriate R-value for Houston’s attic temperatures. The difference is measurable: a sealed and properly insulated duct system runs cooler air to the register and drops the blower motor’s amp draw.
Plenum Re-Insulation
The plenum is the box where supply air leaves the air handler, and it is a condensation magnet in Houston. We re-insulate the plenum as part of sealing when the original wrap is torn, sagging, or waterlogged. Skipping this step leaves the highest-pressure point in the system exposed to attic heat and humidity.
Trusted Brands We Service in Houston
We run Rotobrush rotary brush systems and Nikro negative-air machines on Houston jobs, the same professional-grade tools commercial crews use. Where a homeowner needs source removal before sealing, the Rotobrush agitator breaks loose the caked dust and debris inside older galvanized ducts; the Nikro negative-air unit captures it before it reaches living space. We also stock Honeywell and Aprilaire filtration products for Houston customers who want a higher MERV capture rate after sealing, especially where pollen and mold loading runs high during oak season and after storm events.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Houston Homes
- Post-Harvey hidden corrosion: Homes that took water during Harvey often dried out at the drywall level but left silt and moisture inside supply and return ducts. Camera inspection finds seams that look intact from the outside but are caked with dried sediment inside. Sealing those seams is the only way to stop recontamination from crawlspace humidity.
- Mastic failure in clay-soil neighborhoods: Montgomery County clay shrinks and swells through Houston’s seasonal rain-to-drought cycle, and foundations move. Mastic-only seals at plenum connections crack within two seasons on rural properties. We re-support and reinforce those connections before sealing so the joint is stable, not just covered.
- Sweating flex-duct collars in Cypress subdivisions: Flex runs are often installed with sagging, unsealed collars that pool condensation. Sealing without re-supporting the duct leaves wet insulation behind the register, and microbial growth follows. We re-support and seal in one pass.
- Pollen-loaded return leaks: Houston’s pine, oak, and ragweed seasons push a heavy organic load through every gap in the return side. Sealing supply only leaves the system unbalanced and keeps pulling unfiltered attic and crawlspace air into the house. Return-side sealing is the step that actually reduces the pollen inside a Katy or Cypress home during oak season.
Pricing for Duct Sealing in Houston, TX
Whole-system duct sealing in Houston runs $450 to $1,400. The spread comes down to duct length, the number of leaks found during camera inspection, whether insulation replacement or re-supporting is needed, and access to the attic or crawlspace. A ranch home in Meyerland with separated trunk lines will run toward the higher end; a single flex-run repair in a Cypress home may come in lower. We give a written price before any work starts, and that price does not move. No per-vent surprises, no door-knock upsell. Call (713) 936-5800 for a free estimate on your Houston home.
We Also Serve Cities Near Houston
Our Houston crew serves the surrounding metro daily: Humble, Spring, La Porte, and Webster. If your home sits in one of those communities and you need Houston-grade sealing work, call (713) 936-5800 and we will schedule you on the next open route.
Serving Houston, TX - Our Local Coverage Area
We’re based in the Houston 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 Houston
You can run the AC immediately after duct sealing. The mastic we use cures within an hour in a Houston attic, and by the time we pack the equipment out and walk the site, the seals are set. In July, that means your home starts reconditioning sealed air the same afternoon we leave.
Yes. Homes in unincorporated areas around Houston and on long unpaved drives take in far more fine dust through return-side gaps, especially where the return draws from a garage or crawlspace. Dust loading shortens the useful life of seals and filters alike. We recommend a camera check every 2 to 3 years for rural properties, versus 3 to 5 for in-town homes. Call (713) 936-5800 to schedule a look.
Sealing alone helps, but it typically needs to follow source removal if moisture and organic material are already inside the duct. In Meyerland homes where crawlspace humidity feeds the returns, we clean first, then seal every seam on supply and return, re-insulate, and the smell clears. The seal stops the recontamination; the cleaning removes what is already there.
Yes, and the return side is where the work happens. Oak pollen and fine dust enter through gaps in the return runs, especially in pier-and-beam homes where the return draws from the crawlspace. Sealing those return leaks cuts the particulate intake at the source. After sealing, upgraded filtration from Honeywell or Aprilaire keeps whatever is left from recirculating. Call (713) 936-5800 for a free inspection and a written quote.
The camera finds what you cannot see from the register: separated seams behind intact drywall, corrosion at the plenum, silt left in ducts from Harvey floodwater, sagging flex collars with standing condensate, and fiberglass pull-through from broken trunk connections. In a Sharpstown ranch, we have watched the camera pick up a return seam that was wide open to the attic while the living room register looked perfectly normal. That is the leak your AC is paying to cool every month.
Written by Roy Castellanos, Owner at Hollis Air Duct Houston. Serving Houston since 2004.