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 Terrell Hills
Duct sealing in Terrell Hills typically runs $450 – $1,200 for a whole-home system, with most jobs completed in a single visit and priced in writing before we start. If your HVAC runs constantly through South Texas summers yet rooms stay unevenly cooled, the problem is often air leaking from ducts before it ever reaches your vents.
We’re the Duct Sealing in Terrell Hills crew that knows the difference between a San Antonio permit and a Terrell Hills code review. Because this city operates its own building inspection department independent of Bexar County, we’ve learned which sealing jobs trigger local oversight and how to coordinate that paperwork so you don’t get surprised mid-project. Our scheduling runs from the San Antonio office, but our technicians live and work throughout the metro and routinely handle homes off Terrell Road, near McNay Art Museum, and throughout the Alamo Heights-adjacent streets where Terrell Hills’ mid-century ranches sit on generous, tree-shaded lots. Call (361) 326-5060 and you’ll reach a live person, any hour, who can book your free estimate.
Why Hollis Air Duct Cleaning Is Terrell Hills’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and that longevity matters in a market where fly-by-night duct cleaners rotate through every few seasons. Terrell Hills homeowners aren’t looking for the cheapest coupon; they’re looking for a crew that shows up uniformed, prices the job before touching anything, and leaves the attic cleaner than they found it.
Our technicians follow The Garrison Code on every Terrell Hills job: arrive inside the quoted window, write the price down, complete the work by the book, clean the site. Background-checked and uniformed, they’re accountable from the moment they ring your doorbell. The 365-Day Done Right Promise backs every seal we apply; if a joint fails or a leak reopens within a year, we return and make it right at no charge, including the second visit.
Phones get answered by live people 24 hours a day, not voicemail loops. When you’re balancing a Terrell Hills work schedule and need to confirm a Thursday morning slot or ask whether your 1960s ranch’s original flexible duct runs can be sealed or need replacement, you get a human with access to your file.
Duct Repair in Terrell Hills
Duct Repair in Terrell Hills often starts with a homeowner noticing one bedroom that never cools or a utility bill that climbed without explanation. The mid-century to late-20th-century custom homes dominating this city frequently contain original flexible duct runs, collapsed sections from attic heat degradation, or disconnected returns buried beneath decades of blown insulation. Our crew inspects the full network with a camera, identifies every break or crush point, and presents a written repair plan with exact costs before any cutting or sealing begins. Typical duct repair in Terrell Hills runs $300 – $800 depending on accessibility and the extent of damage.
Collapsed Flexible Duct Runs
Flexible duct installed in the 1960s through 1980s, common throughout Terrell Hills ranches, gradually sags and collapses under its own weight, especially where attic heat exceeds 140 degrees. We replace crushed sections with properly supported new flex or rigid metal where the run allows, then seal every connection with mastic, not tape that will dry and peel.
Disconnected Return Plenums
Return ducts pull air back to your HVAC unit, and when a plenum separates from the main trunk, your system sucks attic air, dust, and insulation fibers straight into your living space. We find these hidden disconnects with smoke testing and negative-air diagnostics, then reconnect and seal them so your system breathes only conditioned air.
Air Duct Sealing in Terrell Hills
Air Duct Sealing in Terrell Hills addresses the slow leaks that develop at every joint, register boot, and plenum connection over decades of thermal expansion and contraction. Rather than replacing functional ductwork, sealing closes the gaps with professional-grade mastic compounds and reinforced mesh, stopping conditioned air from escaping into your attic or crawl space. Most Terrell Hills homes we seal see immediate improvement in room-to-room temperature balance and measurable reduction in HVAC runtime. Whole-home air duct sealing in Terrell Hills typically costs $450 – $1,200, with larger custom ranches at the higher end.
Mastic Sealing Versus Tape
Hardware-store foil tape fails within three to five years in a hot Texas attic. We apply water-based duct mastic, rated for 200-plus degrees, with a reinforced fiber mesh at stress points. The result is a flexible, permanent seal that moves with the duct through summer heat and winter cold snaps without cracking.
Pressure Testing After Sealing
We verify our work. After sealing, we pressurize the duct system and measure leakage at the air handler. A properly sealed system in Terrell Hills should hold within 10 percent of design airflow. If it doesn’t, we find the remaining leaks and seal them before we pack up, at no additional charge.
Trusted Brands We Service in Terrell Hills
Our vans carry sealing and filtration products from Honeywell, Aprilaire, and Abatement Technologies, the same lines commercial HVAC contractors specify for hospitals and schools. For Terrell Hills homes with integrated electronic air cleaners or whole-house dehumidifiers, we stock compatible collar seals and transition fittings so we’re not ordering parts and making you wait. When we seal a system that includes a Honeywell media filter cabinet or an Aprilaire humidifier bypass, we verify those connections are airtight too, not just the main trunk lines. The equipment matters, but so does the technician matching the right seal method to the right component, and our crew trains on these brands specifically.
Common Duct Sealing Problems We See in Terrell Hills Homes
- Original ductwork from the 1960s – 1980s with failing tape seals. Most Terrell Hills ranches were built with fiberglass duct board or early flexible duct joined with cloth-backed tape that turns to powder after forty years in attic heat. We remove the old tape entirely and seal with mastic.
- Condensation and biological growth inside leaky returns. South Texas humidity enters through gaps in return ducts, condensing on cool metal and supporting mold growth. Sealing the return side is often more important than sealing supplies for indoor air quality.
- Shaded, slow-drying attics due to Terrell Hills tree canopy. The city’s strict tree preservation rules mean many homes have dense oak shade over roof penetrations and duct chases. After any duct work, moisture lingers longer; our sealing prevents humid attic air from entering and condensing inside the system.
- Custom homes with extended duct runs to distant wings. Large lots in Terrell Hills mean 80-foot or longer flexible duct runs to guest quarters or detached garage conversions. These long runs lose pressure through every joint; strategic sealing and occasional hard-pipe replacement restore designed airflow.
Pricing for Duct Sealing in Terrell Hills, TX
Whole-home duct sealing in Terrell Hills runs $450 – $1,200, with most single-system ranches falling between $550 and $850. Two-story homes or properties with multiple HVAC zones trend toward the upper range. What moves the price: the linear footage of ductwork, whether we can access all runs from the attic or need to open soffits, the condition of existing seals (scraping failed tape adds labor), and whether we find disconnected sections requiring repair before sealing.
We do not quote per-vent teaser prices that balloon once we’re inside. You get one flat price per system, written down, before any work starts. That price includes all mastic, mesh, access panel resealing, and post-job pressure testing. Estimates are free, and we’ll walk your attic with you if you want to see what we’re seeing. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Terrell Hills
Our Duct Sealing crews work throughout the region, with regular appointments available in Houston, San Antonio, Dallas, and Fort Worth. Scheduling is coordinated from our San Antonio office, and we maintain the same written pricing and 365-Day Done Right Promise at every location. If you have family or rental properties in these cities, the same crew standards apply.
Serving Terrell Hills, TX - Our Local Coverage Area
We’re based in the Terrell Hills 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 Terrell Hills
We typically schedule Terrell Hills appointments within three to five business days, and our technicians live throughout the San Antonio metro so they’re not driving from distant depots. Call (361) 326-5060 for the next available slot; we’ll confirm your window in writing.
Yes, we seal ducts throughout Terrell Hills, from the estates near McNay Art Museum to the ranch-style homes along Terrell Road and the streets bordering Alamo Heights. Every neighborhood gets the same written price guarantee and The Garrison Code standards.
We don’t market emergency duct sealing because it’s a scheduled, diagnostic job, not a burst-pipe situation. If your HVAC has completely failed and you suspect duct damage, we’ll prioritize your appointment and inspect the same week if possible. Call (361) 326-5060 to explain your situation.
Pricing is comparable, though Terrell Hills homes tend to be larger with more extensive duct networks, which can push some jobs toward the higher end of our $450 – $1,200 range. The city’s independent permitting doesn’t add cost for standard sealing, but if code review is required, we handle that coordination without markup.
Every seal is covered by our 365-Day Done Right Promise. If any sealed joint fails, leaks, or separates within a full year, Hollis returns and repairs it at no charge, including the second visit. This is backed in writing on every job, not a verbal assurance.
We also handle Air Duct Cleaning in Terrell Hills and Dryer Vent Cleaning in Terrell Hills if your system needs more than sealing. Many homeowners combine services for a single visit and one flat price.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Terrell Hills since 2004 as part of the Garrison Partners family.