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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Timberwood Park
Duct sealing in Timberwood Park typically runs $450 – $1,200 for a whole-home system, and most jobs are completed in a single visit. If you’re seeing yellow dust on your return registers every February or your upstairs zones never cool evenly, the problem is often leaking joints in the flexible duct runs that snake through your unconditioned attic. We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our crews serve Timberwood Park from our San Antonio dispatch office. We also offer our Dryer Vent Cleaning in Timberwood Park. Call us at (361) 326-5060 for a written estimate before any work starts.
Timberwood Park isn’t like the neighborhoods closer to downtown San Antonio. Most homes here sit on 1 – 5 acre lots in subdivisions like Timberwood Park itself, built from the 1990s through the 2020s, with flexible ductwork running through attics that see 140°F in July and dip below freezing in January. That temperature swing hardens mastic, loosens tape, and opens gaps at duct joints where your blower’s negative pressure pulls in exactly what you don’t want: limestone dust from the Hill Country’s thin rocky soils, and during cedar season, fine yellow pollen from Ashe juniper that coats everything it touches. Our Duct Sealing team knows these homes because we’ve worked on them.
Why Hollis Air Duct Cleaning Is Timberwood Park’s Preferred Duct Sealing Company
We’ve been in business since 2004, and the Garrison Standard we operate under was built for homeowners who’ve already been burned by a contractor once. That means a written price before we touch anything, a 365-Day Done Right Promise backed in writing, and technicians who arrive uniformed, background-checked, and inside the quoted window.
Timberwood Park homeowners call us back because we treat the specific problems this area creates. We don’t sell fogging “sanitisers” that mask cedar pollen odors without removing the source. We don’t seal only the registers you can see and leave attic joints leaking. And we don’t quote one price on the phone and deliver another when the van is in your driveway. The price is written down before work starts. It does not move.
Our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues. When you schedule Duct Sealing in Timberwood Park, you get a real appointment with a real crew, not a four-hour window that stretches to six.
Duct Sealing Services in Timberwood Park
Duct Sealing Services in Timberwood Park focus on closing the gaps, joints, and seams in your HVAC ductwork where conditioned air escapes and unconditioned attic air gets pulled in. In this market, the job almost always involves flexible duct runs in unconditioned attics, where temperature swings degrade connections over time. A typical whole-home sealing job in Timberwood Park runs $450 – $1,200 depending on system size, attic accessibility, and whether we’re addressing one zone or multiple. Homes with two or more HVAC zones, common here, take longer because each zone’s duct network must be isolated and tested separately.
Leak Detection and Pressure Testing
We start with a camera inspection and pressure test to find exactly where your system is bleeding air. In Timberwood Park’s multi-zone homes, we test each zone independently. The pressure differential tells us which joints are leaking supply air and which returns are pulling attic air backward into your system. No guesswork. No sealing what isn’t broken.
Mastic Sealing and Mechanical Reinforcement
We seal joints with duct mastic, a water-based sealant that remains flexible through our temperature extremes, reinforced with mesh tape at high-stress connections. Duct tape fails in attics. Mastic doesn’t. For flexible duct connections, we add mechanical supports so the weight of the duct doesn’t pull the seal apart over time.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Duct Insulation in Timberwood Park
Duct Insulation in Timberwood Park addresses the condensation that forms on cool duct surfaces during our long, humid cooling season. When your AC runs 8 – 9 months a year, attic ducts carrying 55°F air through 100°F-plus attic space sweat. That moisture degrades the outer jacket of flexible ducts, saturates ceiling insulation, and creates the conditions for mold and mildew growth inside the duct lining. A typical duct insulation job in Timberwood Park runs $600 – $1,800 for a whole-home system, depending on linear footage and whether we’re reinsulating existing ducts or wrapping newly sealed lines.
Vapor Barrier Wrapping
We wrap sealed duct runs with insulation rated for our humidity load, sealed with a continuous vapor barrier facing. In Timberwood Park’s unconditioned attics, this stops condensation at the surface instead of letting it form and drip. The vapor barrier faces the attic, not the duct, because that’s where the moisture is coming from.
Condensation Damage Assessment
Before we insulate, we inspect the existing duct jacket for moisture damage. Saturated flexible duct gets replaced, not wrapped. Wrapping a wet duct traps moisture against the liner and accelerates mold growth. We tell you what we find, show you the camera footage, and write the replacement cost into the estimate before we start.
Trusted Brands We Service in Timberwood Park
Our equipment roster includes Rotobrush rotary brush systems for agitation cleaning, Nikro negative-air machines for controlled debris extraction, and filtration products from Honeywell, Aprilaire, and Guardsman. We don’t use hardware-store shop vacs or consumer-grade HEPA boxes. The negative-air method we employ creates suction at the main trunk while rotary brushes dislodge buildup at the branch lines, so debris exits through our collection system rather than blowing into your living space. For Timberwood Park homes dealing with cedar pollen and limestone dust, this matters. The fine particulate here is smaller than standard household dust, and equipment without proper airflow control just redistributes it.
Common Duct Sealing Problems We See in Timberwood Park Homes
- Leaking attic flex-duct joints pulling cedar pollen into returns. After January – February cedar season, we find return ducts coated with fine yellow dust. The pollen enters through gaps at flex-duct connections where negative pressure draws attic air backward into the system. Sealing these joints stops the entry point; cleaning alone doesn’t.
- Condensation at duct joints causing mastic failure. Our humid Gulf-influenced summers create sustained condensation on cool duct surfaces. Water degrades mastic and tape over time, reopening seals that were tight five years ago. We use moisture-resistant mastic and add mechanical reinforcement at these vulnerable points.
- Multi-zone homes with disconnected dampers after cleaning. When flexible duct runs are disconnected for cleaning and reconnected without proper sealing, gaps form at the couplings. In Timberwood Park’s two- and three-zone systems, this is common. We reseal every connection we touch and pressure-test before we leave.
- Fogging “sanitiser” upsells that mask without fixing. We get calls from homeowners who paid for a “disinfecting fog” after cedar season and still saw yellow dust the next year. Fogging doesn’t remove settled pollen from blower compartments or return ducts. Source removal plus sealing does.
Pricing for Duct Sealing in Timberwood Park, TX
A typical duct sealing job in Timberwood Park runs $450 – $1,200 for a whole-home system. Single-zone homes on the smaller end of our market, with accessible attics and straightforward flex-duct layouts, land in the $450 – $700 range. Larger homes with three or more zones, tight attic access, or significant resealing after prior cleaning work run $900 – $1,200. Duct insulation adds $600 – $1,800 depending on linear footage.
What moves the price: number of HVAC zones, attic accessibility, whether we’re sealing existing ducts or replacing moisture-damaged flexible runs, and whether insulation wrapping is included. We write the full price before any work starts. No per-vent pricing. No add-ons at the door. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Timberwood Park
Our crews work throughout the region, including Timberwood Park and surrounding communities. We also provide duct sealing in Houston, San Antonio, Dallas, and Fort Worth. Each location operates under The Garrison Standard with independently owned crews, written pricing, and the same 365-Day Done Right Promise.
Serving Timberwood Park, TX - Our Local Coverage Area
We’re based in the Timberwood 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 Timberwood Park
The yellow dust is Ashe juniper (cedar) pollen, which peaks in January and February in Bexar County. It enters through leaking joints in your flexible attic ductwork, where negative pressure at the return side pulls attic air directly into your system. Sealing those joints stops the pollen entry; cleaning alone just removes what’s already inside. Call (361) 326-5060 and we’ll show you exactly where it’s getting in.
Yes. Flexible duct has a wire-reinforced inner liner and an insulated outer jacket that degrades with our attic temperature swings. We use mastic with mesh reinforcement at flex-duct connections, plus mechanical supports to prevent sagging that pulls seals apart. Rigid metal ducts get sealed at joints and seams with high-temperature mastic, but they don’t sag or flex, so the failure mode is different. Our techs are trained on both.
No. Fogging masks odors temporarily but does not remove cedar pollen, oak pollen, or limestone dust that has settled in your blower compartment and return ducts. The particles are physical debris, not living organisms that a chemical spray eliminates. We recommend source removal with rotary brush agitation and negative-air extraction, followed by sealing the entry points so the debris doesn’t return. That’s what fixes the problem.
Every three to five years, or immediately after any duct cleaning or HVAC service that required disconnecting flex-duct runs. Multi-zone homes have more connection points, and each disconnection-reconnection cycle risks gaps. We also recommend a check after any major cedar season if you’re seeing dust on registers again. The inspection is quick and written into our service call.
It helps with the humidity that enters through duct leaks, but it’s not a complete humidity solution. Sealing stops your system from pulling hot, humid attic air into the returns, which reduces the moisture load your AC must handle. For condensation on duct surfaces themselves, you need proper insulation with a vapor barrier. We assess both during our estimate and tell you which problem you’re actually facing.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Timberwood Park and the greater San Antonio area since 2004.