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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AfterFast, Reliable Duct Sealing Across Cedar Park
We’re the crew Hollis Air Duct Cleaning sends to Cedar Park when a homeowner’s new build is already showing duct problems the builder missed. Our Duct Sealing in Cedar Park runs start at homes off FM 1431 and extend through the subdivisions along Brushy Creek, with scheduling coordinated from our Austin office so we’re moving toward your address, not figuring out where you are. Call (361) 326-5060 and you’ll reach a live person who can book your free estimate and explain what we’ll look for before we step through your door.
Cedar Park isn’t a town of aging Victorians with decades of accumulated grime. It’s a city of rapid-build subdivisions – Avery Ranch, Ranch at Brushy Creek, Buttercup Creek – where production builders put up hundreds of homes in waves from the late 1990s through the 2010s. Those builders spec’d flex-duct systems for speed, not airtightness. We’ve found disconnected joints, sagging runs, and returns stuffed above garages that pull 140°F attic air straight into your living space. That’s why duct sealing in Cedar Park is often a new-construction correction, not an old-house restoration.
Why Hollis Air Duct Cleaning Is Cedar Park’s Preferred Duct Sealing Company
We’ve been driving to Cedar Park since before the 183A Toll extension made it a straight shot from Austin, and we’ve watched the city grow from a handful of subdivisions into the booming suburb it is today. That history matters because we know which builders used which flex-duct specs, which neighborhoods have the attic-mounted air handlers that cook in summer, and where to look first when a homeowner calls about dust that won’t quit.
Our technicians are background-checked, uniformed, and expected to operate under The Garrison Code: arrive inside the quoted window, price the job in writing before touching anything, complete the work by the book, and leave the site clean. No exceptions. Every duct sealing job in Cedar Park carries our 365-Day Done Right Promise – if the seal fails or the joint pulls loose within a year, we come back and make it right at no charge, including a free second visit.
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 when your upstairs bedroom is 10 degrees hotter than the thermostat reads.
HVAC Duct Sealing in Cedar Park
HVAC Duct Sealing in Cedar Park addresses the gaps, disconnected joints, and deteriorated flex-duct liners that production builders left behind in subdivisions built from the late 1990s through the 2010s. The job involves pressurizing the system to locate leaks, applying mastic sealant or mechanical reconnections at joints, and replacing flex duct where the inner liner has degraded beyond repair. A typical HVAC duct sealing job in Cedar Park runs $450 – $1,200 depending on system size, accessibility, and whether we’re working with intact flex duct or replacing failed runs entirely.
Most Cedar Park homeowners call us after noticing hot rooms, excessive dust, or utility bills that climb month over month despite normal usage. The culprit is usually leakage at joints the builder never sealed properly, or flex duct that has sagged or pulled loose in the attic.
Attic Heat and Flex Duct Failure
In many Cedar Park two-story homes, the upstairs air handler sits in an attic that exceeds 140°F in summer. That heat softens the adhesive and inner liner of builder-grade flex duct, causing it to sag, separate at joints, or shed fibers into the airstream. We see this failure mode constantly in Ranch at Brushy Creek and Avery Ranch, where the attic configuration is identical across dozens of floor plans. Our crew uses Nikro negative-air machines and HEPA filtration to contain debris during the repair, then seals or replaces the damaged runs with material rated for the temperature swing.
Construction Debris in New Builds
Builders in Cedar Park’s rapid-growth years often ran HVAC systems during construction to dry paint and flooring. That pulled drywall dust, wood particles, and insulation fragments through the ducts and distributed them to every register before the homeowner ever turned the key. Sealing alone won’t fix this – the debris has to come out first – but sealing afterward prevents recontamination and ensures the cleaned system actually holds pressure. Our Duct Sealing team coordinates with our cleaning crew when both jobs are needed.
Duct Repair in Cedar Park
Duct Repair in Cedar Park fixes the physical damage that sealing alone can’t address: crushed flex duct from storage or rodent activity, disconnected collars at the plenum, rusted metal duct in older ranch homes near the original downtown, and flex runs that have degraded to the point of shedding liner fibers into the air you breathe. A typical duct repair in Cedar Park runs $280 – $850 for localized fixes, or $1,100 – $2,400 if multiple runs need replacement. We write the price down before any work starts, and it does not move at the door.
Homeowners in the 1970s-era ranches off Bell Boulevard often have original galvanized metal duct that has corroded at seams or separated at the main trunk. The newer subdivisions have the opposite problem: flex duct that was fine at handover but failed within the first five years of Cedar Park’s punishing attic heat.
Disconnected Joints and Collapsed Runs
The most common duct repair we perform in Cedar Park is reconnecting flex duct that has pulled away from the air handler or supply plenum. The builder’s zip-tie or tape connection fails, and the duct blows conditioned air into the attic instead of the bedroom. We mechanically secure the joint with a proper collar and clamp, then seal it with mastic rated for the temperature range. The fix takes an hour, the temperature difference upstairs is immediate, and your utility meter slows down.
Metal Duct Corrosion in Older Homes
The ranch homes near Cedar Park’s original downtown and along old RM 620 have metal duct systems from the 1970s and 1980s that rust at seams and leak chronically. We cut out the failed section, fabricate a replacement from matching gauge metal, and seal the joints with mastic and mesh. These repairs last because we size the replacement to the original airflow spec, not whatever fits in the van.
Trusted Brands We Service in Cedar Park
We stock parts and filtration products from Honeywell, Aprilaire, and Abatement Technologies for Cedar Park jobs, which means most repairs don’t wait on a parts run to Austin. Our equipment roster includes Nikro negative-air machines and Rotobrush rotary systems – the same tools commercial crews use in hospitals and schools, maintained to the same standard. When we seal a duct system in Buttercup Creek or Cypress Creek, we’re not improvising with hardware-store tape. We’re using mastic and mechanical fasteners rated for the 140°F attic environment your Cedar Park home was built with.
Common Duct Sealing Problems We See in Cedar Park Homes
- Production-builder flex duct sagging in attics. Homes in Avery Ranch and Ranch at Brushy Creek were built with flex duct strapped too loosely across wide attic spans. Over time the duct sags, creating low points where condensation pools and joints where airflow turbulence increases leakage. We see this in roughly every third Cedar Park home we inspect.
- Drywall dust and construction debris from build-phase HVAC operation. Cedar Park builders ran heating and cooling during construction to speed material curing. That pulled fine white drywall dust through the entire system, coating the blower motor, registers, and duct interior. The dust keeps circulating until the ducts are cleaned and the leaks that let it redistribute are sealed.
- Undersized returns pulling humid attic air. Many Cedar Park two-story homes have return ducts crammed above the garage or in unconditioned attic space. When these leak, they draw 140°F attic air laden with Central Texas humidity directly into the system. That humidity feeds mold and mildew growth inside the ductwork, and your HVAC runs longer to compensate for the false load.
- Pollen-clogged returns reducing effective filtration. Cedar Park’s spring oak and cedar pollen loads are severe enough to pack standard filters to a near-solid state within weeks. Homeowners who don’t change filters often enough end up with return ducts acting as the only filtration path, trapping allergenic dust that later breaks loose and circulates. Sealing the return duct prevents that bypass and protects the system.
Pricing for Duct Sealing in Cedar Park, TX
Most homeowners want to know what duct sealing costs before they commit to an estimate. In Cedar Park’s market, a typical whole-system duct sealing job runs $450 – $1,200. Localized sealing of one or two problem joints starts around $280 – $450. If we’re replacing degraded flex duct runs in a 140°F attic, that range extends to $1,100 – $2,400 depending on linear footage and accessibility.
What moves the price: system size (a 5-ton unit with 15+ registers vs. a 3-ton with 8), whether the attic has decking or we’re working across joists, and whether the flex duct is intact enough to seal or needs full replacement. We inspect first, write the price down, and get your approval before any work starts. No per-vent pricing, no teaser coupons that balloon once the technician is inside. Call (361) 326-5060 for your free estimate – we’ll look at your system and give you the exact number.
We Also Serve Cities Near Cedar Park
Our crews run regularly to Leander, Round Rock, Pflugerville, and Georgetown from our Austin office, with the same written pricing, same background-checked technicians, and same 365-Day Done Right Promise. If you’re in one of these neighboring communities and found this page while searching, the same standards apply to your job. Cedar Park remains our focus here, but we’re on the road to your address too.
Serving Cedar Park, TX - Our Local Coverage Area
We’re based in the Cedar Park 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 Cedar Park
Because Cedar Park’s production builders from the 1990s through the 2010s spec’d flex-duct systems for installation speed, not long-term airtightness. We’ve sealed ducts in homes still under builder warranty where the upstairs air handler flex joint was already pulling loose in the 140°F attic. The materials soften, the tape fails, and you’re losing conditioned air before the paint is dry. Call (361) 326-5060 and we’ll inspect whether your specific build has the failure modes we see across Avery Ranch, Ranch at Brushy Creek, and similar subdivisions.
Yes, significantly. The attic space above many Cedar Park two-story homes exceeds 140°F in summer, which degrades the adhesive and inner liner of builder-grade flex duct faster than in homes with closet-mounted or basement air handlers. We factor this into our material selection and sealing method, using mastic and mechanical fasteners rated for that temperature swing rather than tape that will cook off within two seasons. Our crew will show you the condition of your specific runs with a camera inspection before we quote the work.
Cleaning removes the drywall dust, construction debris, and accumulated pollen that builders left in your ducts. Sealing fixes the gaps and disconnected joints that let that debris recirculate and that waste conditioned air. In a typical Cedar Park new build, we find both problems: debris from construction-phase HVAC operation, plus leaks at joints that were never properly sealed. We often clean first, then seal, so the system holds pressure and stays clean. The price for both services together typically runs $650 – $1,800 depending on system size.
It will cut down on dust recirculation, but only if the source debris is removed first. We were called to a two-story in Ranch at Brushy Creek where the owner had just taken possession of a new build and noticed a fine white haze settling on the upstairs furniture within two weeks. Our camera inspection found drywall dust and construction debris coating the supply and return ducts, and a disconnected flex joint at the upstairs air handler – an attic space that hits 140°F in summer and softens the inner liner. We put the system under negative pressure, used agitation tools with HEPA filtration to pull the source debris out, reconnected and sealed the joint, and the dust settled out within days. Sealing without cleaning would have trapped the debris inside; cleaning without sealing would have let it recirculate through the leak.
Cedar Park’s humid subtropical climate means your HVAC runs nearly year-round, pulling in moisture that promotes mold and mildew growth inside any duct with a leak. The region’s severe spring oak and cedar pollen loads pack filters fast, and when returns are leaky or undersized, the system bypasses filtration entirely. Sealing the duct system closes those bypass paths, keeps humidity out of the airflow, and ensures your filter actually does its job instead of acting as a decorative grille. For a system inspection that accounts for these local conditions, call (361) 326-5060 – estimates are free, and we write the price before we start.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Cedar Park since 2004.