Duct Sealing in New Braunfels - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across New Braunfels

Duct sealing in New Braunfels typically runs $350 – $850 for a whole-home job, and most homes we seal see a 15 – 25% drop in their cooling bill the same summer. If your registers blow weak, your upstairs never cools, or your electric bill keeps climbing while your home stays sticky, the problem is usually air leaking out of the duct system before it ever reaches your rooms.

Call (361) 326-5060

We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and we’ve been sealing ducts in New Braunfels since 2004. Our crews work out of our San Antonio dispatch office and serve New Braunfels homes directly, from the German-era cottages near downtown to the new subdivisions off Loop 337 and FM 306. We know the difference between a 1950s sheet-metal trunk that needs a wrap-and-rebuild and a 2022 flex-duct run with two dozen taped joints failing from day one. Call us at (361) 326-5060 for a free estimate, or keep reading to see what duct sealing actually costs and what we find in local homes.

Why Hollis Air Duct Cleaning Is New Braunfels’s Preferred Duct Sealing Company

New Braunfels homeowners call us because we price the work in writing before we touch anything, and we back every seal with our 365-Day Done Right Promise. That means if a joint we sealed fails inside a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.

Our technicians are background-checked and uniformed, and they arrive inside the quoted window under The Garrison Standard. You’ll know who’s coming before they knock. Our phones are answered by a live person 24 hours a day, seven days a week, not a callback queue that dumps you to Monday.

We’ve built our reputation in New Braunfels on showing up, pricing honestly, and leaving the site clean. Where other outfits compete on a teaser coupon that doubles at the door, we compete on discipline: written price, written guarantee, work done by the book. That’s The Garrison Code our technicians follow on every job.

Duct Repair in New Braunfels

Duct Repair in New Braunfels often starts with a homeowner noticing weak airflow at one register, a room that won’t cool, or a sudden spike in the electric bill. In this market, the repair usually involves fixing crushed flex runs, reconnecting separated joints, or rebuilding sections of original sheet-metal trunk that have failed after sixty-plus years. A typical duct repair in New Braunfels runs $180 – $450, depending on whether we’re reconnecting a single run or rebuilding a section of trunk line.

Crushed or Disconnected Runs

We find this constantly in New Braunfels homes where later remodeling, foundation shift, or a contractor stepping in an attic has flattened a flex duct or pulled a joint apart. A camera inspection shows us exactly where the break is before we cut anything open. We reconnect or replace the damaged section, seal it with mastic and mesh, and test static pressure before we leave.

Sheet-Metal Trunk Rebuilds

In the older homes near downtown and the Comal River, we regularly open up attics and find 1940s – 1960s sheet-metal trunk lines with asbestos-era wrap crumbling underneath newer tape. The repair here is more involved: we remove the failing wrap safely, rebuild the joint with new metal and mastic, then wrap the accessible sections with modern insulation. It’s not a quick tape job, and anyone who quotes one is missing the real problem.

Air Duct Sealing in New Braunfels

Air Duct Sealing in New Braunfels is the difference between an HVAC system that cools your rooms and one that cools your attic. We seal the supply and return ductwork with mastic and mesh, mechanical fasteners, and replacement flex where the original is too far gone. A whole-home sealing job in New Braunfels typically costs $350 – $850, with most falling in the $450 – $650 range for a single-system home under 3,000 square feet.

Mastic-and-Mesh Sealing

Mastic is a thick, flexible sealant we brush onto every joint, seam, and penetration, then reinforce with fiberglass mesh. Unlike foil tape, which dries out and peels in our hot attics within a few seasons, mastic stays flexible and maintains its seal through years of expansion and contraction. We apply it to every trunk joint, every flex connection, and every register boot.

Full-Run Pressure Testing

After we seal, we run a pressure test to measure how much air your ducts are still losing. In New Braunfels, we commonly see pre-seal leakage of 25 – 40% of total airflow, especially in the new subdivisions where builder-grade flex was taped and never properly sealed. Post-seal, we expect single-digit leakage. We show you the numbers before and after.

Trusted Brands We Service in New Braunfels

We carry professional-grade equipment and materials from Nikro, Honeywell, Aprilaire, and Abatement Technologies, the same brands commercial crews use on hospitals and schools. For New Braunfels homeowners, that means we don’t wait on parts. Our vans stock mastic, mesh, R-8 flex duct, mechanical fasteners, and replacement register boots in standard sizes, so most sealing jobs finish in one visit. If your system uses Honeywell or Aprilaire filtration components, we can inspect and reseat those connections while we’re sealing the ductwork, since a loose filter rack leaks almost as much air as a bad joint.

Common Duct Sealing Problems We See in New Braunfels Homes

• Failing asbestos-era wrap on original sheet-metal trunks. In the German-era homes near downtown and along the Comal River, we regularly open attics and find 1950s – 1960s trunk lines with crumbling wrap underneath newer tape. The tape looks fine, but the wrap keeps shedding and the joint leaks again within a season. Proper sealing here means removing the old wrap safely and rebuilding the joint.
• Dozens of taped joints on builder-grade R-6 flex in new subdivisions. Homes in Vintage Oaks, Veramendi, and off Loop 337 were built with flex duct that has a taped joint every few feet. Seal one and the pressure increase blows air out the next. We treat these as full-run audits, not spot repairs, and we camera every run to find the crushed section behind a wall that the builder left.
• Moisture-trapped biological film after cedar season. The Guadalupe River corridor keeps humidity high most of the year, and cedar pollen from December through February leaves a sticky yellow-green film inside return ducts. Seal over that film without cleaning it first, and you’ve trapped moisture against the metal. The cedar-chest smell comes back within weeks.
• Undersized returns in new construction. The same subdivisions with cheap flex often have return ducts too small for the system tonnage. We can’t seal our way out of a duct that was never big enough, but we can identify the bottleneck, show you the static-pressure reading, and quote the right-size return replacement alongside the sealing work.

Pricing for Duct Sealing in New Braunfels, TX

We Also Serve Cities Near New Braunfels

Our crews work throughout the I-35 corridor, including Duct Sealing in New Braunfels and surrounding communities: Seguin, San Marcos, Cibolo, and Schertz. Scheduling and dispatch are coordinated from our San Antonio office, with local crews serving each area directly.

FAQs About Duct Sealing in New Braunfels