Duct Sealing in Alamo Heights - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Alamo Heights

Duct sealing in Alamo Heights typically runs $450 – $1,200 for a whole-home system, with most jobs completed in a single visit. If your HVAC is running constantly but rooms near Broadway or Tuxedo Boulevard still won’t cool, you’re probably paying to condition your attic or crawl space instead of your living space. That’s the problem our Duct Sealing team fixes.

Call (361) 326-5060

We dispatch to Alamo Heights from our San Antonio office, and crews are on local roads daily. We know the tight lots along Castano Avenue, the protected live oaks that shade historic roofs, and the pier-and-beam foundations that shift ductwork over decades. When a technician from Hollis Air Duct Cleaning arrives at your Alamo Heights home, they’re not guessing at what they’ll find. They’ve already worked on the same 1920s gravity systems, the same undersized attic ducts, the same mismatched renovation runs that characterize housing stock from the 78209 ZIP code.

Call (361) 326-5060 for a free written estimate. We price every job before we touch it, and that price is backed by our 365-Day Done Right Promise.

Why Hollis Air Duct Cleaning Is Alamo Heights’s Preferred Duct Sealing Company

We’ve built our reputation in Alamo Heights on showing up when we said we would and leaving the site clean. That’s The Garrison Standard, and it applies to every job we take in this city.

Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive, and they’re equipped with professional-grade tools from Rotobrush, Nikro, and Abatement Technologies. The same equipment commercial crews use, brought to residential jobs in Alamo Heights.

Phones are answered by a live person, 24 hours a day, seven days a week. No voicemail loops, no callback queues, no waiting until Monday when your system is bleeding conditioned air into the attic.

Every repair we complete in Alamo Heights is covered in writing for a full year. If the work fails, we return and make it right at no charge, including a free second visit. That promise is printed on every invoice, not offered as a verbal afterthought.

Duct Repair in Alamo Heights

Duct Repair in Alamo Heights often means addressing the consequences of time, foundation movement, and decades of partial renovations on original 1920s – 1950s duct systems. We frequently find crushed or disconnected flexible duct runs in pier-and-beam crawl spaces, where soil movement and moisture have degraded connections. In attics, we encounter metal ductwork with separated seams or failed tape that was never designed to last twenty years. A typical duct repair in Alamo Heights runs $180 – $450 for localized fixes, with more extensive reconstruction reaching $600 – $900 when multiple runs or the main trunk line are involved.

When Repair Makes Sense

Not every failing duct system needs full replacement. If your home has one or two disconnected runs, a crushed section from a recent roofing job, or a visible gap at a junction box, targeted repair restores performance without the cost of a complete overhaul. We inspect with a camera when access is limited, then show you what we found before quoting.

What We Replace vs. What We Restore

Original galvanized steel ductwork in Alamo Heights bungalows can often be resealed and reinforced. Flexible duct from 1980s or 1990s renovations usually gets replaced, as the insulation sleeve degrades and the inner liner tears. We explain which approach applies to your system before any work starts.

Air Duct Sealing in Alamo Heights

Air Duct Sealing in Alamo Heights addresses the gaps, seams, and connection points that allow conditioned air to escape before it reaches your rooms. In older homes near the Alamo Quarry Market or along Austin Highway, we regularly measure duct leakage at 30 – 40% of total airflow, meaning nearly half the energy your HVAC consumes is wasted. Our sealing process applies mastic compound and reinforced tape at every joint, register boot, and plenum connection, then verifies results with a pressure test. Whole-home duct sealing in Alamo Heights typically costs $450 – $1,200, depending on system accessibility and the extent of leakage found.

Mastic vs. Tape

Hardware-store duct tape fails within months in hot attics. We use water-based duct mastic, brushed on thick at every seam, that remains flexible and airtight for years. For high-pressure points, we reinforce with fiberglass mesh embedded in the mastic. This is the method specified by ASHRAE and the one we apply on every Alamo Heights job.

Post-Sealing Verification

After sealing, we run a duct blaster or pressure pan test to measure improvement. You get the before and after numbers in writing. If we can’t demonstrate reduced leakage, we don’t consider the job complete.

Trusted Brands We Service in Alamo Heights

Our crews carry parts and materials from Aprilaire, Abatement Technologies, and Guardsman, brands we specify because they hold up in the conditions we actually encounter. Aprilaire’s ventilation controls integrate well with the variable-speed systems many Alamo Heights homeowners install during renovations. Abatement Technologies supplies the HEPA filtration and containment products we use when work disturbs decades of accumulated debris. Guardsman coatings and sealants perform in the high-humidity, high-temperature environment of Texas attics where lesser products degrade. We stock these items locally, so most Alamo Heights jobs don’t wait on parts. When you’re running your AC ten months a year, as most residents do, you don’t have time for a return visit because the right material wasn’t on the van.

Common Duct Sealing Problems We See in Alamo Heights Homes

• Original gravity-system returns shared with decommissioned flues. In 1930s – 40s bungalows near French Place or the University of the Incarnate Word area, we frequently find the central hallway return chase was never properly isolated when the original floor furnace was removed. Heated attic air and occasional flue debris enter the duct system until the chase is sealed and rerouted.
• Undersized attic ducts overloading modern HVAC equipment. When Alamo Heights homeowners upgrade to higher-capacity systems without resizing ductwork, the increased static pressure forces air out at every weak seam. We measure airflow and static pressure before sealing to ensure the system can handle what we fix.
• Foundation shift separating pier-and-beam duct runs. The clay soils and mature tree root systems in Alamo Heights cause ongoing foundation movement. Flexible duct in crawl spaces pulls loose at connections, and rigid metal duct separates at joints. We secure with proper supports and flexible connectors where movement is ongoing.
• Roof-level debris and pollen infiltration through unsealed intakes. The city’s strict tree preservation ordinance keeps live oaks and pecans canopied directly over historic roofs. Spring pollen, acorn mast, and leaf debris enter through poorly sealed return air intakes and vent openings, accelerating filter loading and microbial growth inside ducts.

Pricing for Duct Sealing in Alamo Heights, TX

We Also Serve Cities Near Alamo Heights

Our crews work throughout the San Antonio metro area and beyond. We regularly complete Duct Sealing in Alamo Heights and also travel to Houston, San Antonio, Dallas, and Fort Worth for larger projects and multi-system jobs. Scheduling and dispatch are coordinated from our San Antonio office, with local service to each of these markets.

FAQs About Duct Sealing in Alamo Heights