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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After
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AfterFast, Reliable Duct Sealing Across Liberty Hill
Duct sealing in Liberty Hill typically runs $450 – $1,200 for a whole-home system, and most jobs are scheduled within a week of your call. We’re the Liberty Hill crew from Hollis Air Duct Cleaning, and we know the difference between sealing ducts in a 1990s ranch on acreage versus a 2023 build in Santa Rita Ranch or Bryson. Our dispatch team coordinates from the Dallas-Fort Worth office, but our technicians live and work in the Austin metro, which means we’re familiar with the Hill Country limestone dust, caliche soils, and cedar pollen loads that pull through Liberty Hill HVAC systems. Call us at (361) 326-5060 for a free estimate and written price before any work starts.
Why Hollis Air Duct Cleaning Is Liberty Hill’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our reputation in Liberty Hill is built on showing up inside the quoted window and pricing in writing before we touch anything. Liberty Hill homeowners between Leander and Burnet have told us the same story repeatedly: they moved into a new build, ran the system for a month, and found fine white dust coating their window sills and furniture. Our technicians are background-checked, uniformed, and trained to The Garrison Standard, which means they arrive squared away, explain what they found with a camera inspection, and leave the site clean. 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.
Every repair we perform in Liberty Hill is backed by our 365-Day Done Right Promise. If the work fails within a year, we return and make it right at no charge, including a free second visit. That promise is written down on every job, not implied.
Duct Sealing Services in Liberty Hill
Duct Sealing Services in Liberty Hill begin with understanding that this market’s housing stock is overwhelmingly new construction, and new construction ducts are rarely clean at handover. The job involves locating leaks in your supply and return runs, sealing accessible seams with mastic or specialized tape rated for HVAC use, and pressure-testing the system to verify the seal holds. In Liberty Hill, we regularly find that sealing must wait on debris removal first. Drywall fines, sawdust, and limestone-caliche dust from the build site get pulled into the system before landscaping is finished, and sealing over that debris traps it inside to recirculate indefinitely.
A typical whole-home duct sealing in Liberty Hill runs $450 – $1,200 depending on system size, accessibility, and whether we need to remove construction debris before sealing. Homes in the 1,500 – 2,500 sq ft range common to Santa Rita Ranch or Bryson usually fall in the lower half of that range. Larger homes or systems with significant debris loads may run higher.
Construction-Debris Source Removal
Before we seal any seam in a Liberty Hill new build, we inspect with a camera and remove visible debris using negative-air methods and HEPA filtration. Our Nikro negative-air machines pull debris out without pushing it deeper into your living space. This step costs extra on heavily loaded systems, but skipping it means sealing dust and drywall fines behind your ductwork where they continue cycling through the air handler.
Accessible Seam and Plenum Sealing
We seal the plenum, trunk lines, and accessible takeoffs with duct sealing mastic, a thick compound that remains flexible as ducts expand and contract through Hill Country temperature swings. Flex duct connections at the plenum, common in Liberty Hill slab homes, receive particular attention. These are often the leak points builder crews miss.
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 Liberty Hill
Duct Insulation in Liberty Hill addresses a problem that sealing alone cannot solve: thermal loss through duct walls in attics and crawl spaces where summer attic temperatures exceed 140°F. The job involves wrapping accessible ductwork with insulation rated for HVAC applications, typically fiberglass with a vapor barrier, to maintain the temperature of conditioned air from the air handler to the register. In Liberty Hill, we see this most often in homes where the attic duct run crosses an unconditioned garage or where flex duct was installed without adequate insulation wrap during fast-tracked construction.
Whole-home duct insulation in Liberty Hill typically runs $600 – $1,800 depending on linear feet of accessible duct and insulation thickness. Many homeowners combine sealing and insulation in a single visit, which reduces total cost versus scheduling separately.
Attic Duct Thermal Barrier Installation
We wrap accessible attic trunk lines and plenums with insulation secured at proper intervals, paying special attention to where ducts cross near the roof deck or ridge vent. In Liberty Hill’s new subdivisions, we’ve found builder-grade insulation often stops short of the plenum or leaves gaps at support straps where thermal bridging occurs.
Garage and Unconditioned Space Protection
Supply runs through unconditioned garages in Liberty Hill homes lose significant cooling capacity before air reaches the register. We insulate these runs to the full accessible length, sealing the insulation jacket at seams to prevent garage dust and Hill Country limestone particulate from entering the duct envelope.
Trusted Brands We Service in Liberty Hill
Our Liberty Hill crews carry professional-grade equipment from Rotobrush and Nikro, and we stock filtration and sealing products from Honeywell, Aprilaire, and Abatement Technologies. That means no waiting on parts for standard residential systems. If your home has a Honeywell media air cleaner or Aprilaire whole-house dehumidifier integrated with the duct system, we can assess how sealing and insulation affect its performance and airflow. We don’t sell equipment you don’t need. We use the tools that match your system and your home’s specific conditions.
Common Duct Sealing Problems We See in Liberty Hill Homes
- Sealing over construction debris instead of removing it first. Homeowners in new Liberty Hill subdivisions call for sealing after noticing dust, but the real problem is drywall fines and sawdust left from the build. Seal the seams and you’ve trapped that debris to cycle forever. We remove it first.
- Builder-grade flex duct leaking at takeoffs and plenum connections. Fast-tracked construction in Santa Rita Ranch and similar communities often leaves flex duct sealed at the trunk but loose at the plenum or register boot. Hill Country limestone dust pulls in through these gaps from garage and attic spaces.
- Crushed or disconnected return runs missed without camera inspection. In new builds where multiple trades worked simultaneously, we’ve found return ducts crushed by other contractors or never fully connected at the plenum. Sealing the seams won’t fix a duct that isn’t carrying air.
- Cedar pollen caking onto blower motors and coils after sealing. Liberty Hill’s cedar (Ashe juniper) season runs December through February, and pollen loads are severe. If sealing is done without cleaning the blower and coil first, pollen adheres to construction dust already present, reducing system efficiency.
Pricing for Duct Sealing in Liberty Hill, TX
Whole-home duct sealing in Liberty Hill typically costs $450 – $1,200. Duct insulation runs $600 – $1,800. Combined sealing and insulation for a standard 2,000 sq ft home usually falls between $900 and $2,200. What moves the price: system size, accessibility of duct runs, whether construction debris removal is needed first, and whether we find disconnected or damaged duct requiring repair beyond standard sealing.
We give you one flat price per system, agreed in writing before work starts. No per-vent pricing. No add-ons at the door. Every Liberty Hill job includes before-and-after photos of your own ducts so you see what was there and what we did. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Liberty Hill
Our Duct Sealing crews work throughout the north Austin metro, including Leander, Cedar Park, Georgetown, and Round Rock. Each home gets the same written price, camera inspection, and 365-Day Done Right Promise, regardless of zip code.
Serving Liberty Hill, TX - Our Local Coverage Area
We’re based in the Liberty Hill 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 Liberty Hill
Builder-grade ductwork in Liberty Hill’s fast-tracked subdivisions is often sealed at the trunk but left leaking at plenum connections, takeoffs, and register boots. Construction debris inside the ducts also forces the system to work harder, exaggerating any leak. Call (361) 326-5060 and we’ll inspect with a camera to show you exactly what’s there.
Sealing alone won’t stop pollen, but sealing combined with proper filtration and debris removal reduces the total particulate load your system recirculates. In Liberty Hill, we regularly find cedar pollen adhering to construction dust already inside the duct, so cleaning and sealing together matter more than either step alone. We can assess your current filtration and recommend appropriate upgrades from Honeywell or Aprilaire if needed.
Most Liberty Hill builder warranties cover structural and mechanical systems for one year, but warranty terms vary by builder and often exclude maintenance items like cleaning or sealing performed by outside contractors. We document our work with photos and written scope, and we can coordinate with your builder’s warranty department if questions arise. Our 365-Day Done Right Promise covers our work regardless of builder warranty status.
We use camera inspection and pressure testing. A small camera enters the duct through existing registers and returns, showing us disconnected runs, crushed flex, and debris loads. Pressure testing with a calibrated fan measures total system leakage against the conditioned space. Both methods are non-destructive and leave no marks. Call (361) 326-5060 to schedule.
Duct sealing closes gaps where conditioned air escapes the duct envelope; duct insulation slows thermal loss through the duct walls themselves. In Liberty Hill’s 140°F attics, both matter. Sealing without insulation still loses cooling through the metal or flex duct wall. Insulation without sealing still leaks air into the attic. We assess which your system needs, or whether both are appropriate, during our free estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Liberty Hill and the greater Austin metro since 2004.