Duct Sealing in San Leon - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across San Leon

Duct sealing in San Leon typically runs $450 – $1,200 for a whole-home system, with most jobs completed in a single visit. We seal leaks at joints, connections, and penetrations using mastic and metal-backed tape rated for Gulf Coast humidity, then pressure-test to confirm the fix holds. If your HVAC runs constantly but rooms stay uneven, or your electric bill climbs through summer without explanation, leaky ducts are the likely culprit.

Call (361) 326-5060

San Leon sits right on Galveston Bay, and that location shapes everything about how we work here. The salt-laden air, the humidity that never really drops, the older elevated homes on Avenue O and along 9th Street, the post-Ike rebuilds on stilts with ductwork tucked into crawlspaces that flood in a storm. We’ve worked in cottages near Bacliff and bungalows off Grand Avenue where the original galvanized ductwork has been corroding since the 1960s. Our crews drive in from the Dallas-Fort Worth office for scheduled jobs, and we know the difference between a San Leon crawlspace and a dry suburban attic in Houston. Call (361) 326-5060 for a free estimate.

Why Hollis Air Duct Cleaning Is San Leon’s Preferred Duct Sealing Company

We’ve been in business since 2004 as part of the Garrison Partners family, and our Duct Sealing team has handled enough coastal Texas jobs to know what salt air does to ductwork that inland crews rarely see. San Leon homeowners don’t need a lecture on humidity. They need someone who shows up with the right materials for a bayfront environment and prices the job in writing before touching anything.

Our technicians are background-checked and uniformed, and they work under The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, leave the site clean. Every repair carries our 365-Day Done Right Promise. If the seal fails within a year, we return and make it right at no charge, including a free second visit. No negotiation, no runaround.

Phones are answered by a live person 24 hours a day, 7 days a week. You’ll never hit a voicemail loop or wait until Monday for scheduling.

Duct Sealing Services in San Leon

Duct Sealing Services in San Leon address a specific coastal problem: leaks that pull humid, salt-laden bay air into your system, corroding components and spreading mustiness through every room. We find and seal gaps at plenum connections, register boots, and flex duct junctions using mastic compound and UL-181 rated tape that won’t peel in 90% humidity. A typical whole-home sealing in San Leon runs $450 – $1,200 depending on system size and accessibility, with crawlspace work on elevated homes toward the higher end. Homes near the water, where salt spray is constant, often need more extensive joint remediation than properties farther inland.

Leak Detection and Pressure Testing

We pressurize your duct system and measure airflow loss with a calibrated manometer. In San Leon, we regularly find 20 – 35% leakage in homes built before 1980, especially where flex duct was taped rather than sealed with mastic. The test gives us a baseline and proves the improvement after we finish.

Mastic Sealing of Joints and Connections

Mastic is a thick, brush-applied sealant that remains flexible after curing. We apply it to every metal-to-metal and metal-to-flex joint, then reinforce with metal-backed tape. In San Leon’s salt air, this outlasts standard cloth-backed tape by years. We also handle Air Duct Cleaning in San Leon for homes that need both sealing and contaminant removal.

Duct Insulation in San Leon

Duct Insulation in San Leon prevents condensation from forming on cool supply ducts in your humid crawlspace or attic, which leads to mold, mildew, and eventual material failure. We wrap sealed ducts with formaldehyde-free fiberglass insulation, typically R-6 or R-8 depending on location, and seal the insulation jacket with vapor-barrier tape. A typical insulation job in San Leon runs $600 – $1,800 for a full system, with crawlspace access on pilings homes adding labor time. This work pairs naturally with sealing, since insulation over unsealed ducts simply traps moisture at the leaks.

Crawlspace and Pier-and-Beam Applications

San Leon’s elevated homes, common from the 1950s through post-Ike rebuilds, often have ductwork suspended in open crawlspaces where bay winds circulate freely. We use moisture-resistant insulation with reinforced vapor barriers, secured with proper hangers rather than sagging plastic strapping that collects condensation.

Attic Ductwork in Humid Conditions

Attics in San Leon can reach 140°F in August, but the bigger problem is humidity infiltration. Our insulation installs include sealing all penetration points where ducts pass through top plates, preventing the moist attic air from reaching conditioned spaces. We also provide Dryer Vent Cleaning in San Leon for homeowners addressing multiple ventilation concerns.

Trusted Brands We Service in San Leon

We carry professional-grade equipment and materials from Rotobrush, Nikro, Abatement Technologies, Aprilaire, and Guardsman. For San Leon’s corrosive environment, we stock mastic compounds formulated for high-humidity applications and metal-backed tapes that resist salt degradation. Our filtration products from Honeywell and Aprilaire help homeowners upgrade their systems while we’re already on site for sealing or insulation work. Parts are ordered through our Dallas-Fort Worth office with turnaround that keeps most jobs on schedule without waiting for coastal supply house stock.

Common Duct Sealing Problems We See in San Leon Homes

• Corroded metal ductwork from salt air exposure. We regularly find pinhole leaks and rusted joints in galvanized ducts installed before the 1990s, especially in homes near the bayfront. The salt film that deposits during storm winds accelerates corrosion from the inside out once humid air enters through gaps.
• Failed tape joints in crawlspaces under elevated homes. Standard cloth duct tape degrades in 2 – 3 years in San Leon’s humidity. We remove the old residue and reseal with mastic and metal-backed tape rated for permanent installation in wet locations.
• Disconnected flex duct after storm events. High winds under pier-and-beam homes can shift flex duct off collars. We reconnect with proper mechanical fasteners and seal the joint, then add support straps to prevent future separation.
• Return air leaks pulling in crawlspace moisture and contaminants. In San Leon’s older bungalows, return plenums often have unsealed seams that draw humid, musty air directly into your breathing space. We seal these with mastic and verify with pressure testing.

Pricing for Duct Sealing in San Leon, TX

We Also Serve Cities Near San Leon

Our crews travel throughout the region for scheduled duct sealing and insulation work. We regularly serve Houston, San Antonio, Dallas, and Fort Worth, with dispatch and scheduling coordinated from our Dallas-Fort Worth office. Whether you’re on the bay in San Leon or farther inland, the same Garrison Standard applies: written price, background-checked technicians, and the 365-Day Done Right Promise on every job.

FAQs About Duct Sealing in San Leon