Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Fast, Reliable Duct Sealing Across Seabrook
Duct sealing in Seabrook typically runs $450 – $950 for a full system, depending on how much of the ductwork is accessible and how many leaks our camera inspection finds. Most jobs are finished in a single day. If you’re noticing rooms that never cool evenly, a musty smell when the AC kicks on, or dust building up fast near the Galveston Bay side of town, leaky ducts are usually the culprit. Call (713) 936-5800 and we’ll give you a written price before any work starts.
Why Hollis Air Duct Houston Is Seabrook’s Preferred Duct Sealing Company
We’ve worked in enough Seabrook homes to know what this climate does to ductwork. The salt air off Galveston Bay eats through standard foil tape within a season. The humidity forces AC systems to run almost constantly, which means condensation forms on duct surfaces that shouldn’t be damp. Our crews show up uniformed, background-checked, and they know what to look for in stilt homes, in 1970s ranches off Red Bluff, and in the newer builds near Clear Lake. Roy Castellanos runs our team with a simple rule: the price gets written down before we touch anything, and it doesn’t move. That’s been the standard since 2004, and it’s why Seabrook homeowners keep calling us back instead of gambling on the lowest bid.
We answer the phone with a live person, 24 hours a day. No voicemail loops. When you call about duct sealing in Seabrook, you’ll talk to someone who can schedule you and explain the process in plain English before we ever send a truck.
Styles & brands we work with
Air Duct Sealing in Seabrook
Air duct sealing is the process of closing every leak, gap, and loose joint in your ductwork so the air you paid to cool actually reaches your vents instead of escaping into the attic or crawlspace. In Seabrook, this matters more than in most places. Homes elevated on stilts or piers have long duct runs exposed to outside air. Every unsealed joint pulls in crawlspace humidity, salt spray, and whatever else the bay wind decides to push through. We seal those leaks with fiber-reinforced mastic, a thick paste that hardens into a permanent barrier and holds up against the coastal corrosion that destroys standard tapes.
Inspection Before Sealing
We don’t seal blind. We run a camera through your ducts first, looking for the exact failure points: separated joints in attic runs, corroded seams on metal trunks, register boots that were never properly connected. Then we show you the photos and give you a written price for the repair. No surprises.
Mastic and Reinforcement
For Seabrook homes within a mile of Galveston Bay, we use antimicrobial mastic on the supply side, where condensation and salt air create the perfect conditions for mold. This mastic doesn’t just seal the leak; it removes the food source for microbial growth. Standard foil tape gives out within a season here. Mastic lasts for years.
Duct Sealing Services in Seabrook
Duct sealing services cover everything from small pinhole leaks in a single attic run to a full reseal of every joint and boot in your system. In Seabrook, the most common call we get is from homeowners who notice one room stays hot no matter how low they set the thermostat. That’s almost always a supply duct that’s blown open in the attic, dumping cooled air into the insulation instead of the bedroom. A full system reseal in Seabrook generally runs $600 – $950, while sealing a small section of ductwork might be $450 – $600. We give you the exact number in writing before we start.
Supply Plenum and Boot Sealing
The supply plenum is where the air leaves the blower and splits into the ducts that feed your rooms. If that box isn’t sealed tight, you’re losing air before it ever gets a chance to leave. We seal the plenum, every register boot, and every joint in between. In elevated Seabrook homes, we pay special attention to the points where ducts pass through the floor or attic deck, because those flex and separate over time.
Return-Side Leak Repair
Return ducts pull air back to the AC system. When they leak in a crawlspace or attic, they pull in humidity, dust, and whatever the Salt Cedar and coastal air has stirred up. That’s why a moldy smell often comes through the vents even when the coil is clean: the return side is feeding contaminated air into the system. We seal return runs just as aggressively as the supply side.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Seabrook
Our crews work with professional-grade equipment from Rotobrush and Nikro, the same negative-air and rotary brush systems commercial crews use. For filtration and sealing materials, we stock products from Honeywell and Guardsman. What that means in plain terms: when we find a corroded joint or a leaking plenum, we have the right material on the truck to fix it that day, not a promise to come back later. We service all major HVAC brands in Seabrook homes, from Carrier and Trane to Goodman and Rheem. We don’t care who made your system; we care that it stops leaking.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Seabrook Homes
- Crawlspace humidity feeding mold into supply runs. Elevated homes on the floodplain side of Seabrook have ducts that run through open, humid air. Every unsealed joint pulls that moisture into the system, and within months you’ll see mold on the supply side, even with a clean filter.
- Salt air corroding metal duct seams. Homes within a mile of Galveston Bay get a constant dose of salt spray. Standard foil tape fails within one season. The seams you thought were sealed are wide open by spring.
- Long attic runs separating at joints. Those 1970s and 1990s single-family homes around El Mar and Miramar have long attic duct runs that flex with every temperature swing. The joints pull apart, insulation debris gets sucked in, and half your cooled air ends up in the attic.
- Register boots never connected properly. Builders routinely left gaps between the duct boot and the drywall opening. You won’t see it from inside the room, but you’ll feel it as a warm spot near the vent and higher humidity throughout the house.
In a stilt home off Todville Road near the bay, our crew sealed leaking supply runs with fiber-reinforced mastic after camera inspection showed condensation-fed mold on the supply side. We replaced a corroded 16-inch return elbow and sealed every register boot, restoring static pressure so the blower motor no longer cycled short. That’s the kind of repair you can’t fix with a can of tape from the hardware store.
Pricing for Duct Sealing in Seabrook, TX
Here are honest numbers for the Seabrook market. A small, targeted sealing job on one or two accessible ducts runs $450 – $600. A full-system seal, including plenum, boots, and all accessible supply and return runs, typically lands between $600 – $950. If we find extensive corrosion near the bay that requires replacing sections of duct, the price can go higher, but you’ll see the camera footage and get a written quote before we do anything. We don’t do per-vent pricing games. One flat price per system, written down, covered by our 365-Day Done Right Promise. If the seal fails within a year, we come back at no charge. Call (713) 936-5800 for a free estimate.
And for the record, we answer the price question directly: when you call, you’ll get a real number from a live person, not a callback queue and not a bait price that changes at the door.
We Also Serve Cities Near Seabrook
Our Duct Sealing crews work throughout the Bay Area, including League City, Webster, La Porte, and Baytown. If you’re in one of those cities and dealing with leaky ducts, the same written price and 365-Day Done Right Promise applies. Learn more about what we do across the region on our Seabrook service area page.
Serving Seabrook, TX - Our Local Coverage Area
We’re based in the Seabrook 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 Seabrook
Salt air accelerates corrosion on metal duct surfaces and breaks down the adhesive on standard foil tape within months. In Seabrook, we use fiber-reinforced mastic instead of tape because mastic bonds to the metal and creates a shell that resists salt and moisture. If you’re within a mile of Galveston Bay, foil tape is essentially a temporary patch, not a seal. Call (713) 936-5800 and we’ll explain what your specific ducts need.
Because the mold isn’t coming from the filter. It’s growing on the supply side of the ductwork, where cooled air meets the warm, humid air around the duct exterior and causes condensation. In Seabrook, the salt-laden, humid air from the bay accelerates that microbial growth. A clean filter doesn’t address condensation on the outside of a duct. Sealing with antimicrobial mastic does. We target that exact failure point in bay-side homes.
Yes, in most cases. The musty smell usually comes from microbial growth inside ducts or from the system pulling in humid, contaminated air through return-side leaks. Sealing those leaks and applying antimicrobial mastic to the affected supply runs removes the source. If the smell persists after sealing, we’ll show you camera footage of what’s actually causing it. Call (713) 936-5800 to schedule an inspection.
Usually not. Fogging is often sold as an add-on that temporarily masks odors but doesn’t address the leak or the moisture source. Our antimicrobial mastic eliminates the microbial food source at the point of the leak. In severe cases where mold has spread through existing duct liner, we may recommend replacement rather than fogging. We won’t sell you a band-aid. We’ll show you the camera footage and give you the straight answer.
Seabrook’s constant humidity forces AC systems to run nearly year-round, which means more cycles of expansion, contraction, and condensation than inland homes ever see. That thermal stress separates joints faster. Add salt air corroding the metal, and you get leaks in three to five years that inland homes might not develop for a decade. We see it constantly in homes from Todville Road to El Mar. A professional seal with mastic lasts far longer than any tape-based fix. Call (713) 936-5800 and we’ll give you a written quote.
Written by Roy Castellanos, Owner at Hollis Air Duct Houston. Serving Seabrook with the Garrison Standard: written prices, background-checked crews, and a 365-Day Done Right Promise on every job since 2004.