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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Before
AfterFast, Reliable Duct Sealing Across Elgin
Duct sealing in Elgin typically runs $450 – $1,200 for a whole-home system, and most jobs are scheduled within a week of your call. We’re the Duct Sealing in Elgin crew that shows up when we said we would, prices it in writing before we touch anything, and stands behind the work for a full year. Our dispatch office is in Austin, but our technicians live and work in the Elgin area, so we know the difference between a 1920s mill cottage near Main Street and a new build in Trinity Ranch where the flex duct was never properly sealed at handover. Call (361) 326-5060 and a live person will pick up, day or night.
Why Hollis Air Duct Cleaning Is Elgin’s Preferred Duct Sealing Company
We’ve been doing this since 2004 as part of the Garrison Partners family, and our reputation in Elgin is built on showing up inside the window and leaving the site clean. Elgin homeowners call us back because the price we write down is the price they pay, and because our 365-Day Done Right Promise means if a seal fails within a year, we return and make it right at no charge, including a free second visit.
Our technicians are background-checked, uniformed, and trained on The Garrison Code, which means they explain what they’re doing before they do it and account for every tool when they leave. Dispatch and scheduling run through our Austin office, but crews serve Elgin locally and understand the specific problems this market throws at duct systems, from Blackland clay dust in new construction to century-old sheet metal that hasn’t been touched since the cotton-gin era.
Air Duct Sealing in Elgin
Air Duct Sealing in Elgin is often a different job than what you’d expect in other Central Texas markets, because this city’s housing stock splits sharply between historic mill-worker cottages and fast-built subdivisions like Trinity Ranch and Westhaven. The service involves finding every leak, gap, and failed connection in your supply and return ductwork, then sealing them with mastic or mechanical fasteners so conditioned air reaches the rooms it’s supposed to reach instead of leaking into your attic, crawlspace, or wall cavities.
Most Elgin homeowners need duct sealing when they notice uneven temperatures from room to room, dust blowing from registers even after filter changes, or utility bills that climb without explanation. In new construction, the trigger is often construction debris left in flex duct that clogs filters and masks the fact that the builder never properly sealed the plenum connections. A typical whole-home Air Duct Sealing in Elgin runs $450 – $1,200 depending on system size, duct accessibility, and whether we need to remove debris before sealing.
Sealing New Flex-Duct Systems
New subdivisions in Elgin often use flexible ductwork buried under blown-in attic insulation. The builder tapes the connections, but that tape degrades in the first or second cooling season under constant airflow and attic heat. We remove failed tape, clean the mating surfaces, and seal with Guardsman mastic rated for the temperature swings Elgin attics see from May through October.
Historic Sheet-Metal Restoration
The 1920s – 1950s cottages near downtown Elgin have rigid sheet-metal ducts that were never designed for modern HVAC loads. We seal at the seams and where ducts meet the plenum, accounting for the original floor furnace footprint and the pier-and-beam access that lets us work from the crawlspace when the attic won’t cooperate.
Duct Sealing Services in Elgin
Duct Sealing Services in Elgin cover the full range of what it takes to make a duct system airtight, from diagnostic pressure testing to hands-on sealing of every accessible joint, seam, and penetration. We start with a visual inspection and, where appropriate, a camera run to see what we’re dealing with inside the duct runs. Then we pressurize the system to measure total leakage against the conditioned floor area, which tells us whether you’re losing 20% of your airflow to the attic or 40%.
Elgin’s long cooling season means every percentage point of leakage costs you money from April through November. Our Duct Sealing team uses that pressure-test data to prioritize the worst leaks first, so you get the biggest return even if budget constraints mean phasing the work. Duct Sealing Services in Elgin typically fall between $450 for a focused repair on a single zone and $1,200 for a whole-home system with multiple trunk lines and extensive flex-duct replacement. Every price is written and agreed before we start.
Pressure Testing and Leak Location
We use a duct blaster or calibrated fan to depressurize the system and measure leakage in CFM25, cubic feet per minute at 25 Pascals of pressure. A typical Elgin home should test below 10% of conditioned floor area; we’ve seen new builds in Westhaven test at 25% because the builder never sealed the return chase.
Post-Seal Verification
After sealing, we retest. The numbers go on your invoice. If we don’t hit the target we agreed to, we keep working until we do. That’s The Garrison Standard, and it’s how we avoid the “trust me, it’s better” routine that too many contractors fall back on.
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 Elgin
We carry sealing and filtration products from Aprilaire, Abatement Technologies, and Guardsman, and we stock mastic, tape, and mechanical fasteners sized for both the rigid sheet metal in Elgin’s older homes and the flex duct common in Trinity Ranch and Westhaven. This means we don’t order parts and make you wait; we diagnose, seal, and verify in the same visit for most standard jobs. Our equipment roster also includes Rotobrush rotary brush systems and Nikro negative-air machines for the source-removal work that should precede any seal job where construction debris or pollen buildup is present.
Common Duct Sealing Problems We See in Elgin Homes
- Builder tape failure in new subdivisions. The pressure-sensitive tape used on flex-duct connections in Trinity Ranch and Westhaven dries out and peels within 12 – 18 months of the first cooling season. Sealing over that failed tape without removing it traps drywall dust against the leak and creates a new failure point within a year.
- Undersized ducts in historic mill homes. The 1920s – 1950s cottages near downtown Elgin were built for floor furnaces with low airflow requirements. Modern central air forced through those original ducts creates high static pressure that blows seams open at every turn and transition.
- Evaporator coil mold recontaminating sealed ducts. Elgin’s humidity stays high from May through October, and mold growth on the coil upstream of your supply ducts will blow spores through even a perfectly sealed system. We check the coil area before we seal, because sealing a dirty system just preserves the problem.
- Return air pulling from unconditioned spaces. In pier-and-beam homes, the return chase often draws air from the crawlspace through gaps in the floor decking. You’re cooling 90-degree crawlspace air and paying for it. We seal at the floor penetration and verify with smoke pencil testing.
Pricing for Duct Sealing in Elgin, TX
Whole-home duct sealing in Elgin runs $450 – $1,200. A single-zone repair on a small system with good attic access lands near the low end. A full seal on a 3,000-square-foot home with multiple trunk lines, flex-duct replacement, and pre-seal source removal pushes toward the high end. What moves the number: how many linear feet of duct we can reach, whether we’re working in a 130-degree attic or a accessible crawlspace, and whether the job requires debris removal before sealing can begin.
We do not quote per-vent pricing. We price per system, in writing, before any work starts. The price does not move at the door. Estimates are free, and we bring before-and-after photos of your own ducts so you can see what was sealed and what condition the system was in. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Elgin
Our crews work throughout the northeastern Austin metro, including Elgin, Manor, Taylor, Pflugerville, and Hutto. The same written pricing, same 365-Day Done Right Promise, and same background-checked, uniformed technicians apply in every community we serve.
Serving Elgin, TX - Our Local Coverage Area
We’re based in the Elgin 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 Elgin
Because builder-grade flex-duct tape fails within the first 12 – 18 months of cooling-season use, and many Elgin handovers leave drywall dust and Blackland clay in the duct runs that accelerates the failure. We were called to a handover in Trinity Ranch where the homeowners had been in the house six weeks and every time the air handler kicked on, a fine white cloud drifted from the registers. Our tech ran a camera inspection and found the flex duct runs on the supply and return ducts coated in drywall dust and Blackland clay tracked in during framing. We set up negative pressure with HEPA filtration, used agitation tools to break the dust loose, performed source removal, then sealed the joint leaks the builder had left at the plenum and trunk connections with Guardsman mastic – the register dust stopped and the system stopped short-cycling on a clogged filter. Call (361) 326-5060 if you’re seeing similar symptoms.
Yes, but only if the sealing is paired with proper filtration. Elgin’s Blackland Prairie position means spring cedar, oak, and ragweed pollen loads arrive alongside the region’s worst mold counts, and in new builds like Trinity Ranch that pollen binds to drywall dust left in flex duct during construction – turning first-year duct sealing into a pollen and mold control job, not routine maintenance. Sealing the leaks prevents the system from pulling unfiltered attic or crawlspace air, but you also need a filter rated for the particle size you’re trying to stop. We can assess both and recommend Aprilaire or Honeywell filtration upgrades if your current setup isn’t catching what Elgin’s air throws at it.
Yes, with the right access and the right expectations. The 1920s – 1950s cottages near downtown Elgin often have floor furnaces that were removed decades ago, leaving pier-and-beam crawlspaces with original sheet-metal ducts that were never designed for modern airflow. We can seal from below if the crawlspace is accessible and safe, but we also flag when the ductwork is too deteriorated or undersized to justify sealing versus replacement. The Garrison Standard means we tell you straight if sealing is throwing good money at metal that’s past its service life. Call (361) 326-5060 and we’ll camera the runs and give you a written assessment.
We use Guardsman mastic for flexible and rigid duct connections, mechanical fasteners where vibration is an issue, and Nikro negative-air machines with HEPA filtration for source removal when construction debris or heavy pollen loads are present. For diagnostic work, we use calibrated duct blaster fans and digital manometers to measure leakage in CFM25 before and after sealing. The equipment is professional-grade, not hardware-store gear, and we explain what each tool is doing while we’re using it.
If you’re seeing dust from registers, smelling must when the system runs, or your filters clog every three weeks, you likely need both in sequence. Cleaning without sealing leaves the leaks that pulled the debris in; sealing without cleaning traps whatever is already inside. We inspect with a camera, pressure-test for leakage, and recommend the right sequence for your specific system. In Elgin’s new builds, it’s almost always source removal first, then sealing, which is why many homeowners also schedule our Dryer Vent Cleaning in Elgin during the same visit. In older homes, it depends on whether the ducts are dirty or just leaky. The estimate is free – call (361) 326-5060 and we’ll tell you exactly what you’re dealing with.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Elgin since 2004.