Whole-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.
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AfterFast, Reliable Duct Sealing Across La Porte
We seal ducts in La Porte homes built during the 1950s petrochemical boom and in newer subdivisions alike, and we know the difference matters. Our crews dispatch from the Houston office and carry the tools to handle galvanized steel trunk lines, post-flood sludge damage, and the ordinary joint separation that happens when HVAC systems run nearly year-round in this humidity. If your registers blow weak, your upstairs rooms never cool, or you’ve noticed a chemical odor after a plant flare-up near the ship channel, leaky ductwork is likely the culprit. Call (361) 326-5060 for a free estimate and we’ll put a written price in your hand before any work starts.
Why Hollis Air Duct Cleaning Is La Porte’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and our La Porte customers know what that means: a technician who shows up uniformed, background-checked, and inside the quoted window. Our 365-Day Done Right Promise covers every duct sealing job in writing, if the seal fails or the odor returns, we come back at no charge, including a free second visit.
La Porte homeowners aren’t looking for the lowest teaser quote. They’re looking for a crew that won’t renegotiate at the door. We price every job in writing before we touch the system. No per-vent gimmicks, no add-ons once the van is in your driveway.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule.
Our crews know the local housing stock. We’ve sealed ducts in Fairmont Park, worked on post-Harvey recovery in low-lying neighborhoods near the ship channel, and replaced crushed branch runs in Bay Forest ranch homes where the original 1962 slab got modified by a 2019 renovation. That local knowledge changes what we bring to the job and what we find when we open the system.
Air Duct Sealing in La Porte
Air Duct Sealing in La Porte addresses a specific problem set that most Houston suburbs don’t face: decades of industrial particulate accumulation inside galvanized steel ducts, combined with rust corrosion and flood damage that ordinary sealing tape can’t bond to. We don’t just tape joints. We remove the debris that prevents sealant from adhering, repair or replace crushed runs, and apply mastic and mesh to joints that will actually hold under this climate’s near-constant runtime.
A typical air duct sealing job in La Porte runs $450 – $1,200 for a whole-house system, depending on accessibility, the condition of the original ductwork, and whether we’re sealing after a full cleaning or addressing isolated leaks. Every price is written and agreed before work begins.
What We Find in Older La Porte Systems
The mid-century galvanized ductwork installed during La Porte’s petrochemical boom collects microscopic industrial debris that clings to rusted interior walls. Standard cleaning doesn’t always remove it. We use rotary brush agitation from Rotobrush systems and negative-air machines from Nikro to dislodge that material before we seal, or the mastic won’t bond properly and you’ll be calling someone again in six months.
Post-Flood Sealing Protocol
After Hurricane Harvey and subsequent tropical weather, many La Porte homeowners learned that floodwater leaves sludge in ductwork that re-wets and re-molds unless source removal and sealing happen after a full dry-down. We don’t seal over wet or contaminated ducts. We verify the system is clean and dry, then seal to prevent future intrusion.
Duct Sealing Services in La Porte
Duct Sealing Services in La Porte cover the full range of what can go wrong in a system that has been running since the Johnson administration. We seal supply and return trunk lines, repair disconnected branch runs, replace crushed flex duct, and seal the air handler cabinet and plenum connections where pressure loss is often greatest. Our Duct Sealing team works with the understanding that La Porte’s climate and industrial environment create failure modes that don’t show up in standard textbooks.
Whole-system duct sealing services in La Porte typically range from $650 – $1,800 when we include cleaning, repair of damaged runs, and full mastic sealing of accessible joints. Isolated repairs, such as a single crushed branch or failed connection at the plenum, can run $200 – $450. We put the exact number in writing after we inspect your system.
Mastic vs. Tape in Humid Conditions
DIY foil tape fails quickly in La Porte attics. The adhesive releases under constant heat, and the near-year-round runtime means the tape never gets a chance to set in cooler conditions. We use water-based duct mastic reinforced with fiberglass mesh on joints that need to stay sealed. It remains flexible, it bonds to slightly irregular surfaces, and it doesn’t rely on adhesive that degrades.
Pressure Testing After the Seal
We verify our work. After sealing, we run a pressure test to measure leakage at the air handler and throughout the duct system. If the numbers don’t improve, we find what we missed and fix it before we leave. That verification is part of The Garrison Standard, not an extra charge.
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 La Porte
Our equipment roster includes Nikro negative-air machines, Honeywell filtration components, and Aprilaire media cleaners. We stock sealing materials and replacement fittings sized for the duct dimensions common in La Porte’s housing stock, including the 6-inch branch runs and larger galvanized trunk lines found in mid-century homes. That local inventory means we don’t leave your job to order parts. When we find a crushed run or disconnected joint in a Bay Forest or Fairmont Park home, we repair it the same visit rather than scheduling a return trip.
Common Duct Sealing Problems We See in La Porte Homes
- Internal rust in galvanized trunk lines. The original 1950s-70s steel ductwork corrodes from the inside out in La Porte’s humid climate. Sealing tape curls off within months because it can’t bond to rust flakes, and those flakes re-enter the airstream instead of staying contained. We remove the loose material and seal with mastic that adheres to properly prepared metal.
- Crushed branch runs from renovations. In neighborhoods like Bay Forest, we’ve found 6-inch supply lines buried under newer concrete slabs or compressed by added insulation. The system tries to push air through a flattened pipe, pressure drops, and rooms don’t condition. We expose, replace, or reroute the run, then seal the new connection.
- Flood sludge re-wetting. Low-lying areas near the ship channel took water in Harvey and subsequent storms. Ductwork became a reservoir for mold and sediment. Sealing helps only after full source removal and dry-down; we verify both before we apply sealant, or we’re trapping the problem inside.
- Failed DIY tape at the air handler. Homeowners try foil tape on plenum joints and register boots, but La Porte’s attic heat and constant blower operation release the adhesive. The tape hangs loose, the leak returns, and lint from the airstream sticks to the failed adhesive. We clean the joint and apply mastic rated for the temperature and pressure.
Pricing for Duct Sealing in La Porte, TX
Whole-house duct sealing in La Porte typically runs $650 – $1,800, including cleaning, repair of accessible damaged runs, and full mastic sealing. Isolated repairs, such as a single crushed branch or reconnection of a separated joint, range from $200 – $450. If your system requires extensive rust remediation or replacement of multiple branch runs after flood damage, costs can exceed this range, and we’ll tell you that in writing before we proceed.
What affects the price: accessibility of ductwork in attic or crawl space, the extent of rust or contamination that must be removed before sealing, whether we need to repair or replace crushed or disconnected runs, and the overall size of the system. We do not price per vent. One flat price per system, agreed in writing, before any work starts.
Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near La Porte
Our crews work throughout the Houston Ship Channel corridor, including Duct Sealing in La Porte and surrounding communities. We also serve Deer Park, Baytown, Seabrook, and Channelview with the same written pricing, background-checked technicians, and 365-Day Done Right Promise.
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
Duct sealing reduces odor intrusion by closing the pathways where outside air enters the return side of your system, but it works best when combined with thorough cleaning of the industrial particulate already inside the ducts. In the Bay Forest subdivision just north of the ship channel, our tech opened the supply and return ducts on a 1962 ranch home that had been in the same family for three generations. Camera inspection showed a crushed 6-inch branch run buried under a 2019 renovation slab, plus galvanized trunk lines shedding rust and old duct tape into the airstream; we used agitation tools and negative pressure, then sealed the collapsed run with mastic and mesh to bring it back into the system. The blower motor amp draw dropped noticeably after the repair, and the homeowner said the chemical odor that had lingered after the last plant flare-up was gone within a week. Call (361) 326-5060 for an exact quote on your system.
We can seal original galvanized ducts if the metal is structurally sound and we can remove the loose rust and industrial debris that prevents sealant from bonding. If the trunk line has corroded through or multiple branch runs are crushed, replacement becomes the better long-term fix, and we’ll tell you that in writing before we proceed. Our inspection shows you the camera footage so you can see what we see. Call (361) 326-5060 for a free estimate.
Sealing helps prevent mold recurrence only when combined with proper source removal and complete dry-down after water intrusion. Sealing wet or contaminated ducts traps the problem inside. We verify the system is clean and dry before we apply sealant, and we can recommend monitoring strategies for low-lying neighborhoods near the ship channel where flooding risk remains elevated. Call (361) 326-5060 to discuss your specific situation.
Yes, in most cases. When conditioned air leaks into the attic or crawl space before reaching your rooms, the system runs longer to hit the thermostat setpoint. In La Porte’s humidity, that extended runtime also means more moisture removal work for the coil. We’ve measured blower motor amp draw drops after proper sealing, and homeowners typically report more even temperatures between rooms. The exact savings depend on how leaky your system was to start; our pressure test before and after shows the improvement in hard numbers. Call (361) 326-5060 for an inspection and written estimate.
We use video inspection cameras, pressure testing, and infrared imaging to locate leaks in accessible ductwork without destructive exploration. In La Porte’s mid-century homes, the problem areas are often predictable: the plenum connection at the air handler, joints in the attic trunk line, and register boots where the duct meets the ceiling. When we find a leak inside a wall, we evaluate whether the repair justifies limited access rather than assuming every wall must be opened. You’ll see the camera footage and pressure numbers before we recommend any approach. Call (361) 326-5060 to schedule.
Ready to stop losing conditioned air to your attic and start breathing cleaner air in every room? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free, written estimate on duct sealing in La Porte. We’ll inspect your system, show you what we find, and put a flat price in your hand before any work begins. Every job is covered by our 365-Day Done Right Promise: if it’s not right, we make it right, at no charge, including a free second visit.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving La Porte since 2004.