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.
Guardsman Duct Sealing & Repair: The Houston Owner’s Guide
We stock and install Guardsman-compatible duct sealing and repair parts for Houston homes, with most sealing and repair jobs running between $285 and $640 installed, depending on access and how much of the duct run needs attention. The typical repair is done in one visit, and we carry the common Guardsman-sized collars, mastic, tapes, and flex-duct connectors on the truck so we’re not sending a tech back across town for a part. Most Houston homeowners find out their sealing has failed the same way: a room that never quite cools, a utility bill that climbed in July, or a musty whiff from a supply register that wasn’t there in the spring. Dale Whitmore has pulled enough Guardsman-sealed ductwork apart in Houston attics to know exactly what fails first, and it’s rarely the duct itself. It’s the seal.
Which Guardsman Models This Applies To
Guardsman sealing and repair parts apply broadly across residential duct systems: supply trunks and branch runs in slab-on-grade ranchers, flex-duct spider systems in attic builds, and the sheet-metal plenums common in Houston’s older Heights bungalows and 1980s suburban homes. The key compatibility gotcha with Guardsman products is collar sizing. Guardsman collars and takeoffs come in standard diameters (4″, 5″, 6″, 7″, 8″, 10″, 12″), but the depth of the collar flange varies between the contractor-grade and builder-grade lines. If you order a generic takeoff thinking all 8-inch collars are alike, you may wind up with a flange too shallow to bite into the duct board, which means the seal fails within a season. We match by pulling the existing collar and measuring flange depth and gauge, not just diameter.
On the OEM-versus-aftermarket decision: for collars, takeoffs, and dampers, quality aftermarket equivalents in galvanized steel perform as well as Guardsman-branded parts and often cost 20-30% less. For tapes and mastics, we use the same professional-grade materials regardless of what was there before. What matters is the install technique, not the label on the tape.
Styles & brands we work with
Signs Your Guardsman Duct Sealing & Repair Is Failing
- One room never reaches temperature. A separated collar or split tape joint lets conditioned air dump into the attic or wall cavity before it reaches the register. That room fights the thermostat all summer, and the AC runs longer for no gain.
- Dust streaks radiating from a register. When a seal fails on the return side, the duct draws attic air, insulation fibers, and Houston’s fine dust into the airstream. You’ll see gray or brown streaking on the ceiling or wall around the grille.
- Humidity in the house climbing despite the AC running. Houston’s attic air in July can be 90% humidity. A failed return-side seal pulls that wet air into the home. Your AC becomes a humidifier instead of a dehumidifier.
- A musty smell from one vent only. Condensation forms where cold supply air meets hot attic air at a failed seal. That wet duct board grows mold within weeks in Houston’s climate, and that’s what you’re smelling.
- Utility bills up 15-20% with no change in usage. Leaky ducts mean the system moves less of the air you paid to condition. Houston summers are brutal enough without paying to cool the attic.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
In Houston, Guardsman duct sealing and repair typically lands between $285 and $640 installed. A straightforward collar reseal on one or two accessible supply runs sits at the lower end; a full return-plenum reseal with multiple takeoffs, mastic, and re-taping across a large attic system lands at the higher end. The range is driven by three things: how many joints have failed, whether the ductwork is accessible from a walkable attic or requires crawling through blown insulation, and whether we’re replacing collars and takeoffs or just re-sealing existing ones. Every job gets a written price before we touch a single fitting. That price includes all materials, labor, mastic, tape, and cleanup. The work is covered under our 365-Day Done Right Promise: if the seal fails within the guarantee period, we come back and make it right at no charge. No pro-rated language, no fine print.
DIY or Call Us?
What you can safely do yourself: look at exposed ductwork in an unfinished basement or closet chase for visible gaps, peeling tape, or separated collars. Shine a flashlight, take photos, and note which register seems affected. That information cuts our diagnostic time in half. What we don’t recommend is re-sealing ductwork yourself in a Houston attic. Between the heat (attics run 130-150°F here in summer), blown fiberglass, and working around gas flues and electrical runs, a two-hour DIY seal job often becomes a trip to urgent care for heat exhaustion or worse. If the failed joint is behind drywall or inside a soffit, that’s not a repair at all; that’s duct replacement in a wall cavity, and no amount of tape fixes what you can’t reach. For anything more than a visual inspection, call us at (254) 347-2738 and we’ll give you a straight assessment and a written price.
FAQs
In Houston’s climate, expect 12 to 18 years from properly applied mastic and tape on metal ductwork, and closer to 8 to 12 years on flex-duct systems where the outer jacket degrades from attic heat. The seal typically fails before the duct does. Houston’s attic temperature swings, which can exceed 50 degrees across a single day, expand and contract the joints until tape peels and mastic cracks. Call (254) 347-2738 for a free estimate, and we’ll tell you honestly what’s still serviceable and what isn’t.
Most failed seals can be repaired without replacing the duct, provided the duct board or flex core is still intact and the collar hasn’t rusted through. Where we draw the line is when water damage or mold has compromised the duct material itself, because sealing over that just locks the problem in. We’ll show you the damage before quoting the repair, and the written price covers exactly what we agree to do, with no door-step revisions.
A typical sealing repair on one or two failed joints takes 90 minutes to two hours from arrival to cleanup. If we’re re-sealing an entire plenum or working across a large attic system, plan for half a day. We tell you the window before we come, and our techs leave the space cleaner than they found it; that’s part of The Kingswell Way on every visit.
Yes, we carry the common Guardsman-sized collars, takeoffs, mastic, tapes, and flex connectors on every truck, which means most Houston repairs are completed same-day without a second trip. For unusual sizes or specialty plenum fittings, we source from local Houston HVAC supply houses, usually within 24 hours. Call (254) 347-2738 for an exact quote and we’ll tell you if the part is on the shelf before we even schedule the visit.
Kestrel Air Duct Houston is an independent service provider and is not affiliated with Guardsman, Lennox, Trane, or Carrier. We install and service Guardsman-compatible components, and we’ll be straight with you about what your system actually needs. Clean ducts, straight price, no guesswork.
Written by Dale Whitmore, Owner, Kestrel Air Duct Houston at Kestrel Air Duct Houston, serving Houston and nearby areas.