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 Houston
Duct sealing in Houston typically runs $400 – $1,200 for a whole-house seal on standard slab-on-grade homes, with most jobs completed in a single scheduled visit. Our dispatch and scheduling are coordinated from our Houston office, and our crews serve neighborhoods from Spring Branch to Channelview without routing you through a national call center. Call (361) 326-5060 for a free estimate with a written price before any work starts.
We’ve worked on Houston’s housing stock long enough to know what the real problems are. Most of the homes we seal were built between the 1970s and 2000s, flexible duct runs strung through attics that hit 130 degrees in August and stay humid enough to wring out a towel. That combination, specific to the Gulf Coast, means duct sealing here isn’t just about stopping conditioned air from leaking out. It’s about stopping hot, wet attic air from getting pulled into the system and circulating through your bedrooms year-round.
Why Hollis Air Duct Cleaning Is Houston’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been in business since 2004 as part of the Garrison Partners family. That track record predates most of the competitors you’ll find in Houston search results. We don’t compete on the lowest teaser price. We compete on showing up inside the quoted window, pricing in writing before we touch anything, and standing behind the work for a full year.
Our Houston customers aren’t looking for the cheapest bid. They’re looking for the bid they can trust. We’ve heard the stories: crews who quoted $199 over the phone and presented a $1,400 invoice at the door. Technicians who weren’t background-checked, weren’t uniformed, and left insulation scraps in the attic hatch. At Hollis, every technician is background-checked and uniformed, and every job carries our 365-Day Done Right Promise in writing. If the seal fails within a year, we come back and make it right at no charge, including a free second visit.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues. When you call (361) 326-5060, you speak to someone who can schedule your Houston appointment and tell you what to expect.
Duct Insulation in Houston
Duct Insulation in Houston is often the companion repair to sealing, because original flex-duct insulation in our attics degrades from the outside in. The outer vapor barrier cracks. The fiberglass compresses. And once that insulation is compromised, the cold air inside the duct meets the hot attic wall, and condensation forms on the exterior, dripping back into the liner and feeding mold. A typical duct insulation replacement on a Houston home runs $300 – $800 per run, depending on length and accessibility.
When Insulation Fails Before the Seal
We see this on Bingle Road ranches and in the older subdivisions near Alief. The homeowner calls for sealing because rooms won’t cool. We open the attic and find the duct is technically connected, but the insulation is so degraded that the run is sweating like a cold glass on a patio in July. Sealing the joints won’t fix that. We replace the insulation with a fresh R-6 or R-8 wrap, then seal the collars with mastic rated for wet-service conditions.
Reinsulating After Water Damage
Houston’s tropical storms and hurricane remnants don’t always flood the living space. Sometimes they push water through soffit vents or turbine gaps, soaking attic insulation while the drywall below stays dry. We pull the damaged wrap, inspect the flex-duct liner for mold staining, and reinsulate with fresh material before sealing. Sealing over wet insulation traps moisture and guarantees a callback.
HVAC Duct Sealing in Houston
HVAC Duct Sealing in Houston addresses the leaks, disconnects, and crushed runs that develop in flexible duct systems after decades of Gulf Coast heat cycling. We use duct sealing mastic, reinforced mesh tape, and mechanical collars to restore airtight connections at the air handler, plenum, and register boots. A whole-house HVAC duct seal on a typical Houston ranch or two-story runs $400 – $1,200, with single-run repairs starting around $150 – $350.
Camera Inspection Before Sealing
We don’t guess which runs are leaking. Our crews use Rotobrush camera systems to inspect the interior of ductwork before quoting. On a 1978 slab-on-grade ranch off Bingle Road near Spring Branch, our tech pulled the return grille to a collapsed run and found the flexible duct crushed flat against a truss, with condensation staining the inner liner and old mastic peeling at the collar. We performed camera inspection with a Rotobrush, sealed the disconnect with mastic and mesh tape at the air handler, then reinsulated the run so the attic’s year-round sweat wouldn’t re-wet the joint. The homeowner’s back bedrooms finally held temperature through an August afternoon.
Mastic vs. Tape in Humid Attics
Hardware-store duct tape fails in Houston attics. The adhesive degrades. The backing separates. We use water-based duct sealing mastic with embedded fabric mesh, applied to a clean surface and allowed to skin before the system restarts. This creates a flexible, permanent seal that moves with thermal expansion and won’t peel when the August dew point climbs into the mid-70s.
Trusted Brands We Service in Houston
Our Houston crews carry professional-grade equipment and materials from Nikro, Honeywell, and Aprilaire. Nikro negative-air machines and portable HEPA systems let us control dust and debris during attic work. Honeywell and Aprilaire filtration components integrate with the sealed system once the job is complete. We stock common collar sizes, mastic compounds, and R-6 and R-8 insulation wraps locally, so we’re not waiting on a parts run while your attic hatch hangs open. That matters in Houston, where a morning appointment can turn into a sauna crawl if the crew isn’t prepared.
Common Duct Sealing Problems We See in Houston Homes
- Crushed or kinked flex-duct runs in the attic. Original 1970s – 2000s flexible duct in the attic has crushed or kinked runs that let hot, humid attic air get pulled in at every disconnect. Sealing a crushed run without restoring its shape just seals a leak around a collapsed airway. We reshape or replace the run, then seal.
- Mastic and tape failure from year-round humidity. Houston’s mid-70s summer dew points condense inside ductwork whenever the AC cycles off, so mastic and tape that aren’t rated for wet-service attic conditions peel away within a season, reopening the joint. We specify products rated for continuous moisture exposure.
- Post-storm water intrusion in attic duct systems. After a hurricane or tropical storm flood, the first question locals ask isn’t “is the duct dirty” but “did water get into the ducts.” Quick post-storm duct inspection is a Houston-specific service call you don’t get in Dallas. Sealing over water-damaged runs traps moisture and feeds mold instead of fixing the leak.
- Disconnected collars at the air handler plenum. The vibration and thermal cycling of Houston’s 9 – 10 month AC season works metal collars loose from fiberglass or sheet-metal plenums. We find these with camera inspection, reseat the collar, and seal with mastic and mechanical fasteners.
Pricing for Duct Sealing in Houston, TX
Whole-house duct sealing in Houston typically costs $400 – $1,200. Single-run repairs run $150 – $350. Duct insulation replacement adds $300 – $800 per run. What moves the price: attic accessibility (tight truss bays take longer), the number of disconnects we find, whether crushed runs need replacement rather than reshaping, and whether post-storm water damage requires liner replacement before sealing.
We give you one flat price per system, agreed in writing before work starts. No per-vent pricing. No add-ons at the door. We show you camera footage of what we found, explain what we’re sealing and why, and you approve the written price before we open the mastic bucket. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near Houston
Our Houston-based crews also handle Duct Sealing in Houston area suburbs including Galena Park, Pasadena, Channelview, and South Houston. Same equipment, same written pricing, same 365-Day Done Right Promise. If you’re in the Houston metro and your ducts are leaking, we cover your area.
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.
FAQs About Duct Sealing in Houston
Because Houston AC systems run 9 – 10 months a year and the mild winter never resets them, original 1970s – 2000s flex ducts in slab-on-grade ranches stay damp inside, so sealing a Houston run is as much about stopping humid attic air from being pulled into the system as it is about stopping conditioned air from leaking out. That wet-cycle problem differs from dry-climate cities where sealing is purely an efficiency measure. Call (361) 326-5060 and we’ll explain what we found in your specific attic.
Yes, we schedule attic work during morning hours when possible, and our crews are equipped with portable ventilation and hydration protocols per The Garrison Code. Mastic application requires a clean, dry surface, so we manage sweat and condensation during application, then allow proper cure time before system restart. If your attic is dangerously hot on a given day, we’ll reschedule at no penalty rather than do rushed work.
Yes. Post-storm water intrusion soaks attic insulation and duct liner, and sealing over water-damaged material traps moisture and feeds mold. We inspect with cameras, replace wet components, and allow adequate dry time before sealing. This is standard protocol for our Houston storm-response calls. Call (361) 326-5060 to schedule an inspection.
We use Rotobrush camera inspection to view the interior of every accessible run, plus pressure testing where accessible. Visual inspection of the attic exterior finds disconnected collars, crushed runs, and degraded insulation. We show you the footage and explain each finding before quoting. No guesswork, no blanket recommendations.
Sealing stops the infiltration of hot, humid attic air that condenses on cold duct surfaces and creates mold-friendly conditions. But sealing alone won’t eliminate existing mold. If we find biological growth during camera inspection, we’ll recommend duct cleaning or liner replacement before sealing. The 365-Day Done Right Promise covers our seal work; it doesn’t cover mold that was already present and left untreated.
Ready to stop throwing conditioned air into your Houston attic? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll inspect your system with cameras, give you a written price before any work starts, and back every seal with our 365-Day Done Right Promise. No voicemail. No callback queues. Just a live person and a crew that shows up squared away.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Houston since 2004 as part of the Garrison Partners family.