Duct Sealing in Katy - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Katy

Duct sealing in Katy typically costs $450 – $1,200 for a whole-home seal depending on system size and accessibility, and most jobs are completed in a single visit. If your home was built in the last five years in one of Katy’s master-planned communities west of the Grand Parkway, there’s a strong chance your ducts were never properly sealed at handover. We see it constantly.

Call (361) 326-5060

We’re the Duct Sealing crew for Hollis Air Duct Cleaning, and we serve Katy from our Houston dispatch office. Our technicians are background-checked, uniformed, and arrive inside the quoted window. Calls are answered by a live person, 24 hours a day, 7 days a week. If you’re in Cinco Ranch, Old Katy, or the new developments stretching toward Fulshear, we’ll quote your job in writing before any work starts. Call (361) 326-5060 for a free estimate.

Why Hollis Air Duct Cleaning Is Katy’s Preferred Duct Sealing Company

We’ve been in business since 2004 as part of the Garrison Partners family, and our track record predates most local competitors in the Houston metro. That longevity matters in a market like Katy, where construction crews rotate fast and warranty work often gets passed between subcontractors who never return.

Our 365-Day Done Right Promise covers every duct sealing job in writing. If the seal fails within a year, we come back at no charge, including a free second visit. No negotiation, no runaround. Katy homeowners tell us this matters because they’ve already dealt with builders who disappeared after closing.

We price every job in writing before touching your system. The number on the page is the number at the door. Our technicians follow The Garrison Code on every job: arrive inside the window, price in writing, complete the work by the book, leave the site clean. You’ll know who’s arriving before they walk in.

Duct Sealing Services in Katy

Duct Sealing Services in Katy address a specific problem that worsens with every cooling season: conditioned air bleeding into your attic through gaps, joints, and failed seams instead of reaching your rooms. In Katy’s humid subtropical climate, your HVAC runs at high capacity most of the year. Every cubic foot of cooled air that escapes into a 140-degree attic is money you’re paying to cool plywood and insulation. A typical whole-home duct seal in Katy runs $450 – $1,200, with larger two-story homes in master-planned communities toward the higher end and smaller ranch homes in Old Katy toward the lower.

Leak Detection and Static Pressure Testing

We start with a pressure pan test and visual inspection of accessible ductwork. Many Katy homes, especially new builds, show open joints at trunk lines and boot takeoffs that builders never sealed. We measure static pressure at the air handler to quantify exactly how much air you’re losing before we quote the repair.

Mastic Sealing and Mechanical Fastening

We seal joints with a Guardsman-rated mastic sealant applied over fiberglass mesh, not duct tape, which deteriorates in Katy’s attic heat within two years. Metal connections get mechanical fastening plus sealant. Flexible ductwork gets support strapping to prevent sagging, which creates new leaks over time.

Duct Insulation in Katy

Duct Insulation in Katy protects against a problem most homeowners don’t notice until their upstairs bedrooms stay hot all summer: attic heat transferring through thin duct walls and warming your cooled air before it reaches the register. In Katy’s climate, uninsulated or poorly insulated ducts in vented attics can raise supply air temperature by 8 – 15 degrees. A typical duct insulation job in Katy runs $600 – $1,800 depending on linear footage and whether we’re reinsulating existing ducts or wrapping newly sealed lines. Many homeowners combine sealing and insulation in one visit.

Vapor Barrier Wrapping

Katy’s humidity condenses on cold duct surfaces, especially in spring and fall when attic temperatures swing. We use insulation with an intact vapor barrier facing the duct, sealed at seams with matching tape. Without this barrier, moisture migrates into the insulation, compresses it, and breeds mold.

Replacement of Water-Damaged Insulation

We regularly find collapsed or mold-stained insulation in Katy homes where roof leaks or poor attic ventilation preceded us. We remove the damaged material, treat the duct surface, and install new insulation. This isn’t cosmetic. Wet insulation has an R-value near zero and actively damages your ducts.

Trusted Brands We Service in Katy

We carry professional-grade equipment and materials from Rotobrush, Nikro, and Guardsman, the same tools commercial crews use in hospitals and schools. For filtration and sealing products, we stock Honeywell and Aprilaire components. We keep common sealants, mastics, and insulation wraps on our Katy-area vans so we’re not making a supply run on your time. If your system uses specific boot sizes or trunk dimensions common in local builder specs, we likely have the fitting in stock. Fast turnaround matters when your upstairs bedrooms are 85 degrees in July.

Common Duct Sealing Problems We See in Katy Homes

• New construction with unsealed joints. Builders in Katy’s master-planned communities often leave trunk-to-boot connections open, especially on second-floor runs that are harder to inspect. Attic heat and Katy Prairie silt get drawn into these gaps, so your system moves dirt instead of conditioned air.
• Sealing over construction debris. Some warranty crews or handymen seal leaks without first removing drywall dust and silt. The sealant bonds to dirt, not metal, and fails within months. Worse, it bakes the debris into the seam where you can’t clean it.
• Flexible ductwork sagging in humid attics. Katy’s attic humidity softens the wire helix in cheap flex duct. It droops, kinks, and tears at the support points. Sealing the ends doesn’t help when the middle is crushed flat.
• Sealing the wrong components first. We’ve found new homeowners or their warranty crews who caulked registers and the air handler cabinet while leaving trunk leaks wide open. The system looks sealed but still bleeds air into the attic, and the debris load never gets addressed.

Pricing for Duct Sealing in Katy, TX

We Also Serve Cities Near Katy

Our crews work throughout the west Houston corridor. We regularly seal ducts in Katy, Fulshear, Richmond, Sugar Land, and Stafford. Scheduling is coordinated from our Houston office, with local technicians dispatched to your area. Same flat-price, written-quote standard applies in every community we serve.

FAQs About Duct Sealing in Katy