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 Webster
Duct sealing in Webster, TX typically costs between $450 and $1,400 for a full system, depending on duct count, accessibility, and how much leakage we find. Most Webster jobs are completed in a single day. If your July electric bill keeps climbing while two bedrooms stay five degrees warmer than the kitchen, separated duct joints are the usual culprit. Our crews work throughout Webster weekly. For a written quote before any work starts, call (713) 936-5800.
Why Hollis Air Duct Houston Is Webster’s Preferred Duct Sealing Company
Webster homeowners call us because we show up inside the window we gave you, write the price down before opening a single access panel, and stand behind the work for a full year in writing. No bait pricing. No van that shows up and suddenly finds three other problems that double the invoice. Roy Castellanos runs our crews to one standard: do the job the way we said we would, at the price we put on paper. That’s The Garrison Standard, and it’s written into every job ticket in Webster.
We work on 1970s ranch-style homes off Highway 3, two-story brick builds near NASA Road 1, and the newer subdivisions east of I-45. Different eras, different duct problems. What stays the same: a background-checked, uniformed technician, professional-grade tools from Rotobrush and Nikro, and a number you can call at any hour where a live person picks up. Not a voicemail loop.
Styles & brands we work with
Air Duct Sealing in Webster
Air Duct Sealing in Webster means closing every joint, seam, and connection point in your supply and return ductwork so the air your blower moves actually reaches each room, instead of leaking into the attic or pulling in humid Gulf air. A Webster home with original 1970s flex duct often loses 20 to 30 percent of conditioned air before it ever hits a register. When that happens, you’re paying to cool the attic.
Where the Leaks Happen
The most common failure points we find in Webster homes are plenum connections, register boots, and flex-duct takeoffs. The steel collar where flex duct clamps onto a supply box loosens over time, especially in hot attics where sealant breaks down faster. Mastic and aluminum tape restore that connection so negative pressure pulls from the return grille instead of the attic atmosphere.
When to Seal
You need duct sealing if rooms run noticeably warmer or cooler than the thermostat setting, if dust appears on furniture within days of cleaning, if humidity levels inside stay above 55 percent with the AC running, or if an energy audit showed high leakage. Webster homeowners who have never had ducts touched since the 1990s usually see the biggest change.
Duct Sealing Services in Webster
Duct Sealing Services in Webster include pressure testing, camera inspection, register boot sealing, plenum repair, and full-system mastic application. We start by locating every gap, not guessing at them. The price you get covers the full job for your system, not a per-vent rate that balloons when the tech finds more gaps than the salesperson estimated.
Inspection and Testing
We use a camera scope to look inside your ducts before recommending anything. You’ll see the gaps yourself if you want to walk through the findings with the technician. Then we seal the accessible ductwork with mastic, a heavy paste that hardens over the joint, finished with aluminum tape where the mastic needs reinforcement. This is what commercial crews use, not hardware-store vinyl tape that dries out and peels in a Texas attic.
Verification After Sealing
When the job is done, we measure static pressure and airflow at the registers. You’ll know the system moved back toward design spec. If anything we sealed fails within 365 days, we return at no charge and fix it. That’s the 365-Day Done Right Promise, written on every invoice from Hollis Air Duct Houston.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Webster
We work on duct systems attached to all major HVAC equipment brands, with a specialty in sealing flexible duct common on Trane, Carrier, Lennox, Goodman, and Rheem systems found throughout Webster. Our sealing materials work with any brand of ductwork. We keep mastic, foil tape, collars, and takeoff fittings stocked on the trucks so most Webster jobs don’t need a second trip for parts. If you know your system uses Honeywell filtration or an Aprilaire media cabinet, we seal around those components without compromising the installation. Duct Sealing done right keeps every component working as the manufacturer intended.
Common Duct Sealing Problems We See in Webster Homes
- Original 1970s flex duct degrading in hot attics. The outer vapor barrier cracks, the inner liner separates, and sealant loses adhesion after 40-plus summers above 100 degrees. Standard painting won’t fix it; mastic and re-taping will.
- Register boots pulled loose from drywall. Years of vibration plus humidity cycling cause the boot to separate from the ceiling or floor opening. Conditioned air dumps into the wall cavity or attic instead of the room.
- Plenum separation on air handlers. This is the big one. When the main supply or return plenum separates from the unit, your system pulls attic air. In Webster’s humidity, that means moisture and mold spores get distributed through every supply register.
- Storm-driven debris pushing through unsealed joints. After hurricane season winds and heavy thunderstorms, fine debris finds its way past loose connections. We find attic insulation fibers and dust inside supply ducts on Webster homes after every major storm season.
See the difference
Before
After
Before
After
Before
AfterPricing for Duct Sealing in Webster, TX
A full duct sealing job on a typical Webster single-family home runs roughly $450 to $1,400. Smaller single-story homes with accessible ducts run on the lower end. Two-story homes with difficult attic access or extensive plenum repair run higher. What you won’t see is a per-vent price that starts small and multiplies by the time the tech finishes. You get one flat price per system, written down before work begins. Call (713) 936-5800 for a free estimate. We’ll schedule a time, arrive inside the window, and hand you a written price before touching a single access panel.
Key Takeaways for Webster Homeowners
- Most Webster homes built before 2000 have enough duct leakage to justify sealing, even if the system still blows cold air.
- Humidity is the multiplier here: leaked air pulled into the system from the attic carries moisture, not just heat.
- One flat price per system, written down before work starts. No per-vent pricing games.
- Every job includes a camera inspection and after-work verification. You see what was wrong and what changed.
- The 365-Day Done Right Promise covers every repair in writing for a full year.
We Also Serve Cities Near Webster
Our crews serving Webster regularly work in League City, Seabrook, La Porte, and Alvin. If you’re in one of those areas and need duct sealing in Webster or your own city, call (713) 936-5800 and we’ll get you on the schedule.
Serving Webster, TX - Our Local Coverage Area
We’re based in the Webster 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 Webster
Duct sealing matters more in Webster because Gulf humidity accelerates every failure mode. High attic moisture breaks down sealant faster, rusts metal collars, and turns small leaks into mold sources. A dry climate hides leaks; Webster’s climate feeds them. The same gap that wastes 15 percent of your cooling in an arid climate pulls mold-spore-laden attic air into a Webster system. Sealing those joints cuts off the moisture source at the point of entry.
Yes, duct sealing typically reduces cooling costs by 10 to 25 percent in Webster homes when leakage is significant. When supply ducts leak into the attic, your air handler runs longer to satisfy the thermostat. That’s direct electricity cost. When return ducts leak, the system pulls hot, humid attic air into the evaporator coil, forcing the AC to work harder to remove heat and moisture it didn’t need to handle. Sealing both sides brings run times down measurably. Call (713) 936-5800 and we’ll test your system before quoting.
No. Duct sealing is interior HVAC work that doesn’t require a permit or HOA approval in any Webster neighborhood we serve. You won’t need to notify your community association, and the work stays inside your attic, walls, or mechanical closet. If you’re in a newer subdivision with strict architectural rules, nothing we do changes the exterior appearance of your home. The only thing your HOA will notice is a truck that leaves before dinner.
Homes within a mile of Clear Creek should have ducts inspected every 3 to 5 years, more often after a flood event or major storm. Floodplain homes see elevated crawlspace and attic humidity, which accelerates joint failure. After any major rainfall that brings standing water near your foundation, we recommend an inspection even if the interior stayed dry. Moisture migration through the building envelope is slow, but it finds unsealed duct joints eventually. If you had water intrusion, call (713) 936-5800 before mold becomes established.
The supply plenum, return plenum, register boots, and flex-duct takeoff collars are the most common leak sites in Webster homes. We seal them with a heavy mastic compound applied over the joint, reinforced with aluminum tape where the connection takes mechanical stress. This is not duct tape. Mastic hardens into a permanent, airtight seal that won’t peel in a 130-degree attic. The combination restores static pressure to design specs and keeps humid attic air outside your system.
Call Hollis Air Duct Houston for Duct Sealing in Webster
If you’re seeing dust, feeling humidity, or noticing rooms that never reach the thermostat set point, the fix is usually in the ducts. We’ll send a background-checked, uniformed technician to your Webster home, test the system, show you the leaks on camera, and hand you a written price. No surprises. No pressure. Every job covered by the 365-Day Done Right Promise. Call (713) 936-5800 today for a free estimate. A live person answers, 24 hours a day, 7 days a week.
Written by Roy Castellanos, Owner at Hollis Air Duct Houston, serving Webster with written pricing and the 365-Day Done Right Promise.