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.
Trusted Duct Sealing for Houston Homeowners
Duct sealing in Houston typically costs between $850 and $2,400 for a full system, depending on home size, duct accessibility, and the extent of leakage. Most jobs in the Houston area are completed in a single day, and the payoff is immediate: rooms that finally hold temperature, lower electric bills during our brutal summers, and air that stops carrying attic dust into your living room. Hollis Air Duct Houston has been sealing ducts since 2004 under The Garrison Standard, which means a written price before any work starts and a 365-Day Done Right Promise behind every job. Call (713) 936-5800 for a straight answer and a free estimate.
Roy Castellanos leads our Houston crew, and the standard he enforces is simple: arrive inside the quoted window, price the job in writing before touching anything, do the work by the book, and leave the site cleaner than we found it. That discipline is why homeowners in neighborhoods from Meyerland to Kingwood - and those needing Duct Sealing in Humble - call us back when their ducts need attention. We’re part of the Garrison Partners family, independently owned and operated, and we answer our phones 24/7 with a live person.
Duct Insulation
Duct Insulation is the layer of thermal protection wrapped around your ductwork that prevents conditioned air from losing its temperature as it travels through unconditioned spaces like attics and crawl spaces. In Houston’s climate, where attic temperatures routinely climb past 130°F in July and August, uninsulated or under-insulated ducts force your AC to work far harder than it should. Hollis Air Duct Houston inspects existing insulation for gaps, compression, and moisture damage, then replaces or upgrades it to the correct R-value for our climate zone. Whole-home duct insulation in Houston typically runs $600 to $1,800, and the work is covered by our written guarantee.
What We Check During Inspection
We look for three things: sections where insulation has pulled away from the duct body, areas where condensation has soaked through and created a breeding ground for mold, and gaps where rodents have nested in the material. Each of those conditions means your system is losing efficiency and possibly circulating contaminants. We document everything with photographs before recommending any work, so you see exactly what we see.
Replacement Standards
When insulation is beyond repair, we replace it with material rated for Houston’s heat and humidity, not a generic product off a hardware store shelf. The job includes sealing all seams and joints before the insulation goes on, because insulation over a leaking duct just hides the problem. You get one flat price for the entire insulation job, written down before we start.
Styles & brands we work with
HVAC Duct Sealing
HVAC Duct Sealing is the process of closing every leak, gap, and disconnected joint in your forced-air system so the air your furnace or AC produces actually reaches the rooms it’s supposed to. In Houston houses, we routinely find 20 to 30 percent of conditioned air escaping into attics and wall cavities before it ever hits a vent. Hollis Air Duct Houston seals ducts using mastic and UL-listed tapes applied at every joint, seam, and connection point, then verifies the result with a pressure test. Typical HVAC duct sealing in Houston runs $850 to $2,400 for the complete job, with the price locked in writing before work begins.
Why Mastic Beats Tape Alone
Mastic is a thick, paste-like sealant that goes on wet and dries to a durable, flexible seal. Unlike standard duct tape, which dries out and peels within a few years, mastic stays bonded through Houston’s heat cycles and doesn’t degrade. We apply it to every accessible joint, and we use UL-listed foil tape only where mastic isn’t practical, like tight clearances and certain connections to register boots.
Pressure Testing the Result
After sealing, we can run a duct leakage test to measure how much air your system still loses. The reading tells us, and you, whether the job met the standard. If any area still leaks beyond the expected threshold, we find it and seal it before we call the job done. That verification step is part of why our work carries a full year of coverage under the 365-Day Done Right Promise.
Duct Repair
Duct Repair means fixing physical damage to your ductwork: crushed sections, disconnected joints, holes from rodents or nails, and rusted-out return pans. In Houston, the two most common culprits are heat and humidity in the attic degrading old flexible ductwork, and pest damage in older homes. Hollis Air Duct Houston repairs or replaces damaged duct sections using the same commercial-grade materials we use on new installations. Most duct repair jobs in Houston fall between $350 and $1,200 depending on how many sections are damaged and how accessible they are; you’ll know the exact price before we start.
Common Damage We Find
In attics throughout Houston, from Cypress to Clear Lake - and homes needing Duct Sealing - Spring included - we see flex duct that has collapsed under its own weight when supports failed. We also see crushed runs where someone stepped on the duct during a service call or DIY project. And in many older homes, we find original metal duct that has rusted through at the seams, pulling attic air directly into the return side of the system.
Repair or Replace?
When damage is limited to a few feet of run, a targeted repair is the honest answer and the one we recommend. When multiple sections are crushed, torn, or badly rusted, replacement usually costs less long-term than patching again every year. We walk you through the condition of every section we believe needs work, so the decision is yours with clear information. Our home page explains more about how we approach every job at Hollis.
Air Duct Sealing
Air Duct Sealing is the most direct fix for the leaks that waste energy and pull attic dust, fiberglass particles, and humidity into your home’s air stream. Every sealed joint means fewer contaminants entering the air you breathe and less strain on your AC system. Hollis Air Duct Houston treats air duct sealing as a precision job: we locate leaks by inspection and pressure testing, seal them with mastic, and verify the work before we leave. Full air duct sealing in Houston runs $850 to $2,400 depending on system size and access, with a written price agreed before the first tool comes off the truck.
Attic Access Work
Most Houston homes have ducts that run through the attic, where heat and humidity make leaks more costly. We work in those spaces carefully, using drop cloths and keeping walkways clear. When access is tight, we still reach every joint we need to seal; if a section is genuinely unreachable, we tell you that before quoting the job, not after.
Return-Side Sealing Matters
The return side of your system is under negative pressure, which means it pulls air in through every gap. In Houston houses with equipment closets, those gaps often draw air from the garage or wall cavities, where car exhaust and building dust collect. Sealing the return side is as important as sealing supply ducts, and we treat it that way on every job. For homes in nearby Spring, our Duct Sealing in Spring page covers that service area in detail.
Duct Sealing Services
Duct Sealing Services at Hollis Air Duct Houston cover the full scope: inspection, leak testing, sealing of all accessible joints and connections, repair of minor disconnects, and a final verification. We don’t sell a one-size-fits-all package, and we don’t charge per vent or per linear foot with surprise add-ons at the door. The service is priced as one flat amount per system, written before work starts. Most duct sealing services in Houston run $850 to $2,400, and every job is backed by the 365-Day Done Right Promise in writing.
What’s Included in the Flat Price
Your written price includes the full inspection, all sealing work we agree on, cleanup, and the one-year warranty. There’s no separate trip charge, no disposal fee tacked on mid-job, and no hourly rate that can climb if a section takes longer than expected. If we find additional issues during the work, we stop and call you with the finding and the price before proceeding.
When You Should Book
The best time to seal ducts in Houston is before the summer cooling season, but any month works. If you’ve noticed rooms that never reach the thermostat setting or dust accumulating within days of cleaning, sealing is likely part of the fix. We also recommend sealing any time you’re planning to replace your AC system, so the new unit doesn’t push air out of the same leaks. Our Duct Sealing in Humble page covers how we serve that side of the metro area.
What happens when you call
- 1
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.
Brands We Service
We work on duct systems of every make and configuration, and our equipment roster is built around tools from Rotobrush and Nikro, two of the most respected names in the air systems trade. Rotobrush rotary brush systems let us agitate and remove debris from ducts before sealing, so we aren’t sealing over a layer of dust. Nikro negative-air machines create the pressure-controlled environment that keeps particles from spreading through your home while we work.
When filtration is part of the job, we recommend and install products from Honeywell and Aprilaire, including media filters and whole-home filtration systems that pair with sealed ductwork for measurably cleaner air. Whether you have a custom-built system from a small contractor, a mass-market flex-duct layout, or any other make, we can seal it to the same standard. Our team knows the common failure points on each type because we see them in Houston attics every week.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Rooms that never reach the thermostat setting. If your front room is always five degrees warmer than your bedroom in August, you’re probably losing conditioned air through leaks. Sealing closes those losses and balances the system.
- Dust on every surface within days of cleaning. Leaking return ducts pull attic air, insulation fibers, and dust into your home. The same dust keeps landing on your furniture because the system keeps pumping it in.
- Electric bills that spike every summer. Houston summers are expensive no matter what, but a system losing 20 to 30 percent of its air costs far more to run. Sealing pays for itself over a few seasons.
- Hissing or whistling near vents and registers. Air escaping through small gaps under pressure makes noise. If you hear it, the leak is already costing you money.
- Musty or stale air that improves when the fan runs constantly. That’s a sign the system is pulling air from places it shouldn’t when the fan cycles. Sealing the return side is usually the fix.
Our Process, Step by Step
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Walkthrough and visual inspection. We inspect accessible ductwork in the attic, closets, and crawl spaces. We document every problem with photos before we recommend anything, so you never have to guess what we found.
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Written quote before any work. The price covers the entire job, in writing. No per-vent fees, no hourly rates, no surprises at the door. If you don’t approve the work, nothing happens.
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Sealing and repair. Our techs apply mastic and UL-listed tape to every accessible joint, seam, and connection. We repair minor disconnects and warn you immediately if we find something unexpected.
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Verification. We check our work with pressure testing where applicable and walk you through what changed. The goal is a system that holds air, not just a convincing invoice.
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Cleanup and written warranty. We leave the site cleaner than we found it and hand you the 365-Day Done Right Promise in writing. If any sealed joint fails within a year, we return and fix it at no charge.
How Much Does Duct Sealing Cost in Houston?
A typical duct sealing job in Houston - or La Porte Duct Sealing - runs $850 to $2,400 for a full system. The specific number depends on three things: how many linear feet of ductwork you have, whether the ducts run through an attic or a crawl space, and how severe the leakage is when we inspect. Homes under 2,000 square feet with straightforward attic access tend toward the lower end. Larger homes, older systems with multiple damaged sections, and tight access typically land higher.
What affects the price the most is access. Houston attics range from wide-open walkable spaces in some 1960s-era ranch homes to tight, low-slope cavities in newer builds. The harder the ducts are to reach, the longer the work takes. Leakage severity matters too. A system with ten disconnected joints costs more to seal than one with hairline gaps at the boots, even if both houses are the same size. Avoid overpaying by requiring a written flat price before work starts, which is exactly what we provide. A free estimate means we inspect, measure, and give you a number that doesn’t move. If someone quotes you $199 without looking at your ducts, that’s not an estimate; that’s a foot in the door. Call (713) 936-5800 and we’ll give you an honest range for your specific house.
Our Service Area Near Houston
We serve Houston and the surrounding communities daily, including League City, Baytown, Atascocita, Fresno, Alvin, La Porte, Seabrook, Webster, and Mission Bend. Our techs live in the metro area, route by neighborhood, and typically arrive inside the quoted window we set when you book. We answer the phone 24/7 with a live person, and we schedule most jobs within the week. If you’re in any of those areas, call us at (713) 936-5800 and we’ll tell you honestly what day works. For a broader look at what we do, start at our home page, and for Humble-area service, see Duct Sealing in Humble.
Serving Houston, TX - Our Local Coverage Area
We’re based in the Houston area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Duct Sealing in Houston
Duct sealing is the process of closing every leak, gap, and disconnected joint in your home’s air duct system using mastic sealant and UL-listed tapes. It stops conditioned air from escaping into attics and wall cavities and prevents attic dust from entering your living space. The result is lower energy use, more balanced temperatures, and cleaner indoor air. In Houston’s climate, sealing is one of the highest-impact improvements you can make to an existing HVAC system.
Most duct sealing jobs in Houston are completed in one day, typically 4 to 8 hours depending on home size and access. Tight attics and older systems with multiple damaged sections can push the job into a second day. We tell you the expected timeline when we give the written quote. Call (713) 936-5800 for a time estimate specific to your house.
Full duct sealing in Houston typically costs $850 to $2,400, with the price based on system size, access difficulty, and leakage severity. We provide a written flat price before any work starts, so there’s no hourly billing or surprise add-ons. The estimate is free, and the price doesn’t move at the door. Call us for an exact quote on your system.
Yes. We seal duct systems connected to every major HVAC brand, including Trane, Carrier, Lennox, Rheem, Goodman, and American Standard. Duct sealing is about the distribution system, not the unit itself, so the brand of your AC doesn’t change the work. Our techs know the common duct configurations paired with each major brand in Houston homes.
We answer the phone 24/7 with a live person, and we prioritize repairs where a disconnected duct is pulling attic air into the return or where water is dripping through a ceiling. If the problem is urgent, tell us when you call and we’ll get a tech routed to you as quickly as the schedule allows. We never charge extra for answering the phone at night. Call (713) 936-5800 if you need help now.
Every duct sealing job is covered by the 365-Day Done Right Promise in writing. If any sealed joint or connection fails within one year, we return and fix it at no charge, including a free second visit. The warranty is specific and written, not a vague satisfaction guarantee. Roy Castellanos and the whole Hollis team stand behind it on every job.
Clear a path to the attic access point and move anything stored directly under it. If your dogs are uncomfortable with visitors, secure them in a room away from the work area. We handle everything else, including drop cloths, cleanup, and keeping the work area contained. There’s no need to move furniture in most homes, and we’ll tell you if your specific layout needs anything extra when you book.
Schedule Your Duct Sealing Service in Houston Today
Call (713) 936-5800 and talk to a live person who can answer your questions and schedule a free estimate. You’ll get a written price before any work starts, and the job is covered in writing for a full year. No pressure, no bait pricing, no cleanup left to you. That’s the Hollis way in Houston.
Written by Roy Castellanos, Owner at Hollis Air Duct Houston, serving Houston since 2004.