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 La Porte
Duct sealing in La Porte typically runs $450 – $950 for a standard single-family home, and the job usually takes one day. Roy Castellanos and the crew at Hollis Air Duct Houston know what’s inside La Porte ductwork because we’ve opened hundreds of systems here. The oily gray dust, the humidity-swollen joints, the crawlspace leaks under pier-and-beam homes off Fairmont Parkway – it’s all familiar ground. If your registers are blowing weak or your utility bill keeps climbing, call (713) 936-5800 for a free estimate with the price in writing before anyone touches a tool.
Why Hollis Air Duct Houston Is La Porte’s Preferred Duct Sealing Company
We’ve been sealing ducts in La Porte long enough to know what works here and what fails here. Roy Castellanos built this business on written prices and a 365-Day Done Right Promise that covers every duct sealing job for a full year. If the seal fails, we come back at no charge – it’s on paper, not a handshake. Our technicians arrive background-checked and uniformed, and the phone is answered by a live person 24/7, so a homeowner in Lomax who finds a new leak at 9pm talks to a human, not a voicemail queue.
La Porte homes demand more from a duct seal than inland houses do, and crews that don’t work here regularly miss it. The Ship Channel fallout, the salt air off Galveston Bay, the sweating duct joints in unconditioned attics – each one changes how the sealant bonds and where leaks actually hide. We run professional-grade equipment from Rotobrush and Nikro, not hardware-store gear, and every tech follows The Garrison Code: arrive inside the window, price in writing, finish by the book, leave the site clean. That’s the standard La Porte homeowners tell us they were missing with the last company.
Styles & brands we work with
HVAC Duct Sealing in La Porte
HVAC Duct Sealing in La Porte means closing the gaps, splits, and disconnected joints in your duct runs so the air your handler pushes actually reaches the rooms you paid to condition. In a town where summer heat and humidity run from May through October, leaks mean that cooled air escapes into the attic or crawlspace while hot, damp air gets pulled in. We seal the full system – supply and return – using commercial-grade duct mastic or aluminum tape rated for high humidity, not the consumer tape that dries out and peels in two seasons.
Where La Porte Ducts Actually Leak
Most of what we find is at the transitions: where the duct meets the register boot, where two runs join, where the trunk line turns. But La Porte has its own pattern, especially in the 1950s-to-1980s single-family stock off Spencer Highway and in Bayside Terrace. Pier-and-beam homes often lose more conditioned air through crawlspace ducts than through attic runs, because the connections under the floor have been flexing and pulling apart for sixty years. We open those first.
What a Real Seal Involves Here
There is no shortcut that works in La Porte. We use negative-air containment during source removal so the oily particulate we dislodge doesn’t wind up back in your living room, then we clean the metal to a surface sealant can actually bond to. Skipping that step is why cheap duct sealing fails within a year around here. After the sealant cures, we run a pressure test to show you where the leakage stands – before and after numbers, not promises.
Duct Repair in La Porte
Duct Repair in La Porte is what happens when sealing isn’t enough because the duct itself is damaged – crushed runs, rusted-out sections, or joints that have separated completely. We see all three constantly in this city, particularly in original metal ductwork from the 1960s and 1970s that was never designed for forty years of Gulf Coast humidity. When a section has corroded through or pulled apart under a pier-and-beam home, the right repair is replacement, not another layer of goo.
Repairing vs. Replacing Duct Runs
We try to repair before we recommend replacement, but we won’t seal a duct that’s already rotting. In La Porte, rust-through on the bottom side of return ducts is common where moisture condenses against the cool metal in the crawlspace. A short replacement section with sealed, mastic-covered connections gives you another decade of service, and we price it before we touch it.
Duct Repair After Storm Damage
Galveston Bay is close enough that storm surge and heavy rain find their way into crawlspaces and attics. After a hard season, we check for water-stained insulation, swollen duct board, and separated joints. If we find moisture intrusion, we say so and we don’t seal over it – sealing a wet duct means trapping the moisture inside, which is how the moldy smell you get after a rain never goes away. Duct repair here starts with getting the system dry and solid.
Trusted Brands We Service in La Porte
Hollis Air Duct Houston services and seals duct systems on all major residential HVAC brands, and our parts stock covers what La Porte homes actually run: Honeywell and Aprilaire filtration components, plus the fittings and sealants we use daily. Because we work this city’s housing stock week in and week out, the most common repair parts for 1970s La Porte systems are on the truck when our tech parks, not ordered and backordered twice. That means most duct sealing and repair jobs finish the same day without a second trip for a forgotten part.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in La Porte Homes
- Sealant peeling off oily ductwork. Duct sealant applied over Ship Channel fallout won’t bond and peels within months. We source-remove with HEPA filtration and agitation tools first, because that oily residue is not just cosmetic – it’s a bond breaker.
- Leaks hidden in the crawlspace, not the attic. A pier-and-beam home near Galveston Bay often leaks most where the ducts run under the floor. Sealing only the visible attic ducts leaves the biggest air loss untouched, and your bill stays high.
- Water-based mastic failing in humid attics. Cheap mastic can re-emulsify in La Porte’s summer heat and moisture cycle, softening and dripping off the duct. We use commercial-grade sealants rated for high-humidity, unconditioned spaces.
- Moldy odor that sealing alone won’t fix. If a duct smells after it rains, the problem is moisture inside the run or in the crawlspace, not just a leak. Sealing over a wet duct traps that moisture; the right fix is drying, cleaning, then sealing.
Pricing for Duct Sealing in La Porte, TX
Sealing a single-system home in La Porte generally runs $450 – $950, depending on duct count, accessibility, and whether we’re sealing attic runs, crawlspace runs, or both. If we find damage that needs repair, you’ll get a separate written line item – never a surprise add-on at the van. Homes near the Ship Channel sometimes need source removal before sealing, which is priced at $250 – $450 for a typical system and is the difference between a seal that holds for years and one that fails in one summer. Roy Castellanos makes sure every La Porte customer gets one flat price per system in writing before work starts. Call (713) 936-5800 for a free estimate that won’t move at the door.
We Also Serve Cities Near La Porte
Our crews work La Porte daily, and we also run calls to Baytown, Seabrook, Webster, and League City. If you’re just outside La Porte, the same written pricing and 365-Day Done Right Promise apply. Learn more about our Duct Sealing process or see how we serve the wider area at La Porte.
Serving La Porte, TX - Our Local Coverage Area
We’re based in the La Porte 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 La Porte
Yes. The oily particulate from Ship Channel and petrochemical fallout settles inside duct runs and accelerates joint breakdown, so we recommend La Porte homeowners inspect and reseal duct systems every 3 – 5 years instead of the 5 – 7 year interval that works inland. The residue also means sealing has to be done properly – source removal first – or the seal fails early. Call (713) 936-5800 and we’ll tell you what your system actually needs after we look at it.
Because someone sealed the attic ducts and skipped the crawlspace. In pier-and-beam homes around Bayside Terrace, the largest leaks are typically under the floor where duct connections have pulled apart over decades of soil movement and humidity. A complete seal means sealing every accessible connection, above and below the living space. We check both before we quote, and the price covers the whole system.
No. The smell after rain means moisture is entering the system or the crawlspace, and sealing over a wet, contaminated duct traps the problem inside. The correct sequence in La Porte is to dry and source-remove the contaminated area with HEPA filtration, repair any water intrusion, then seal. Skip the drying step and the odor returns, sealed or not. We’ll tell you exactly which step your home needs.
Duct cleaning removes what’s built up inside the runs – the dust, the oily residue, the debris from fifty years of use. Duct sealing closes the gaps where conditioned air escapes and where outside air, humidity, and particulates are pulled in. On a 1970s La Porte system with original metal ducts, you typically need both, in that order: clean first so the sealant adheres, then seal so the contamination rate drops and the system pressure holds.
Often yes, and no – sealing alone won’t stop it. The fine gray dust with the slightly oily feel is a mix of household dust and industrial fallout from nearby refining operations, and it only fully clears when the ducts are source-removed with proper filtration and then sealed. Sealing prevents new unconditioned air from pulling more particulate through leaks, but the material already inside has to be removed first. For a particle count before and after, call (713) 936-5800 – the estimate is free.
Written by Roy Castellanos, Owner at Hollis Air Duct Houston, serving La Porte, TX.