Fast, Reliable Duct Repair & Sealing Across Houston
Duct repair and sealing in Houston typically costs $280-$650 for most residential jobs, with flex duct replacement running $180-$340 per run and full system sealing averaging $1,200-$2,400 depending on home size and accessibility. Our Duct Repair & Sealing team serves Houston homeowners with same-day response across the inner loop and surrounding neighborhoods, including the Heights, Montrose, and Northside. We’ve been answering calls from Houston houses since 1984, and we know the difference between a quick seal and a proper fix that holds up through August. Call (844) 685-6342 for upfront pricing and a free estimate.
Why Bellows Air Duct & Vent Co. Is Houston’s Preferred Duct Repair & Sealing Company
Houston homeowners have called us back for forty-two years because we show up when we say and we stand behind the work. Our technicians know the 77008 and 77009 ZIP codes by heart - from the pier-and-beam crawl spaces in the Heights to the retrofitted attic chases in Montrose homes that were never designed for central air.
We’re not a dispatch service sending random contractors. Our background-checked, uniformed technicians arrive in marked vehicles, camera-inspect every duct system before touching a tool, and present one honest price before work starts. The number on the phone is the number on the invoice.
Our 90-Day Done Right Promise covers every Houston job in writing. If it’s not right, we return at no charge. No paperwork, no arguing. That’s been our policy since Ray Castillo founded the company, and it’s not changing.
Calls are answered by a live person, 24 hours a day. Not a voicemail tree, not an app. When your AC is blowing 85-degree air through a collapsed flex duct in July, you talk to a human who can dispatch help.
Our Duct Repair & Sealing Services in Houston
Flex Duct Repair
Houston’s housing stock demands real expertise with flex duct. In the 77006 ZIP code and throughout Montrose, we regularly find original flex runs from 1970s and 1980s HVAC retrofits that have collapsed in attic cavities too tight to crawl through. The combination of 140-160°F attic temperatures and near-constant AC operation degrades the foil facing and insulation faster than anywhere we’ve worked outside the Gulf Coast.
In a Montrose bungalow (77006), we found underfloor flex ducts that had wicked floodwater during Harvey - the inner liner was stained with silt and mold. We sealed the compromised sections with mastic and reinforced the connections, but recommended full replacement due to the extent of contamination. That’s the honest assessment you get from us: we’ll repair what’s repairable and tell you straight when replacement is the smarter spend.
Typical flex duct repair in Houston runs $180-$340 per run for accessible sections, with $50 off any repair over $250.
Duct Sealing
Sealing is where Houston’s humidity makes its presence felt. Every gap, breach, or disconnected collar in your duct system becomes a condensation point when 55°F supply air passes through a 90°F, 85% RH attic. That condensation pulls humid air inward, and within a few seasons you’ve got microbial growth inside the duct liner.
Our sealing process starts with a camera inspection to map every leak, then we seal accessible joints and connections with professional-grade mastic. For the Heights and Northside/Lindale Park homes with complex retrofit duct layouts, we often find that proper sealing restores 20-30% of lost airflow without replacing a single run. Most sealing jobs in Houston fall between $280-$650 for partial systems, $1,200-$2,400 for whole-house sealing.
Metal Duct Repair
Older Houston homes in the Third Ward and parts of the Heights still have original galvanized metal ductwork from early central air retrofits. These systems corrode at seams and joints, especially where past flooding left residual moisture in basements or crawl spaces. We repair metal duct with proper sheet metal patches and sealant, matching the original construction rather than slapping flex duct over a failing metal run. Metal repair typically runs $320-$580 per section in Houston.
Duct Insulation
When attic temperatures in Houston regularly exceed 140°F, bare or degraded duct insulation is throwing money away. We replace collapsed or moisture-damaged insulation with new wraps rated for Gulf Coast conditions, paying special attention to the low-clearance attic cavities common in 77008 and 77009 where standard insulation thickness won’t fit. Insulation replacement runs $220-$480 per run depending on access difficulty.
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 Houston
We stock parts and specify equipment from Nikro, Honeywell, and Aprilaire - the same brands serious HVAC contractors use, not hardware-store substitutes that fail in Houston’s heat. Having the right materials on the truck means most Houston jobs finish in a single visit. We don’t order parts and disappear for a week. When we seal a duct with mastic or replace a flex run in your Heights attic, we’re using products rated for the temperature and humidity your system actually faces.
Common Duct Repair & Sealing Problems We See in Houston Homes
- Condensation and microbial growth inside flex duct liners. Houston’s near-year-round AC operation combined with Gulf Coast humidity creates constant condensation conditions. In attics hitting 140-160°F, any breach in the duct wrapper becomes a mold factory. We see this in systems older than 10-12 years that have never been camera-inspected.
- Collapsed or crushed flex duct in inaccessible spaces. Retrofitted central air in 1910s-1940s homes means flex runs crammed through interior wall chases and underfloor crawl spaces. In the Heights and Montrose, we regularly pull access panels to find ducts flattened by decades of compression or damaged by rodents seeking cooler spaces.
- Legacy flood contamination from Harvey and earlier events. Technicians working 77009 and 77006 regularly find underfloor flex ducts that wicked floodwater during Harvey and were simply dried out and left. The inner liner shows visible silt and mold staining, meaning occupants have been breathing through a contaminated system for years.
- Disconnected collars and failed tape seals. Houston’s thermal expansion cycles - extreme attic heat followed by 55°F supply air - cause joints to work loose over time. Duct tape dries and fails; we replace it with permanent mastic seals that flex with temperature changes.
Pricing for Duct Repair & Sealing in Houston, TX
Here’s what duct repair and sealing costs in the Houston market:
| Service | Typical Range |
|---|---|
| Flex duct repair (per run, accessible) | $180 - $340 |
| Flex duct repair (tight attic/crawl space) | $260 - $420 |
| Metal duct repair (per section) | $320 - $580 |
| Duct sealing (partial system) | $280 - $650 |
| Whole-house duct sealing | $1,200 - $2,400 |
| Duct insulation replacement (per run) | $220 - $480 |
| Camera inspection with written report | $89 - $149 |
What moves the price: accessibility (crawl spaces and tight attics take longer), extent of contamination (flood-damaged liners need more than sealing), and whether we’re matching existing materials or upgrading. We inspect with a camera first, show you what we found, and give one upfront price before any work begins. No bait coupons, no price changes at the door.
Standing offers: $50 off any repair over $250, free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Call (844) 685-6342 for your exact quote - estimates are free.
We Also Serve Cities Near Houston
Our Houston service area extends to Pasadena, Alief, Missouri City, and Pearland. Same technicians, same equipment, same upfront pricing. If you’re in a bordering community and your duct system needs attention, we cover those ZIP codes too.
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 - Duct Repair & Sealing in Houston
Houston’s 80-90% relative humidity and near-constant AC operation create condensation inside duct systems that simply doesn’t happen in drier markets like Phoenix or Denver. Every gap or breach in your ductwork becomes a moisture entry point, which means we seal more aggressively here and we always check for mold inside the liner before closing up. If you’re seeing water stains around vents or smelling musty air, that’s humidity doing damage. Call (844) 685-6342 for a camera inspection - estimates are free.
Have them camera-inspected immediately, even if it’s been years. We still find Harvey-contaminated ducts in 77006 and 77009 that were dried out and left in place - the silt and mold remains inside the liner. In some cases we can seal and reinforce; in others, replacement is the only safe option. We’ll show you the camera footage and give an honest recommendation. Call (844) 685-6342 to schedule - estimates are free.
Yes, though tight-access jobs run $260-$420 per run versus $180-$340 for open attics. Our technicians carry flexible repair tools specifically for the cramped retrofit attics common in Heights and Montrose bungalows. We camera-inspect first to confirm the damage location, then determine whether repair or replacement makes sense given the access difficulty. Call (844) 685-6342 to discuss your specific layout - estimates are free.
We service original flex duct from 1970s-1990s retrofits, galvanized metal ductwork from early central air installations, and hybrid systems found throughout the inner loop. The 77008 and 77009 ZIP codes in particular have a mix of pier-and-beam homes with underfloor runs and older homes with attic chases that were never designed for modern duct dimensions. We match repair methods to the original construction rather than forcing one solution. Call (844) 685-6342 - estimates are free.
We seal every joint and breach with mastic rated for Gulf Coast temperature swings, replace degraded insulation with proper wraps, and verify with a post-repair camera inspection that no gaps remain. In Houston’s 140-160°F attics, even a small unsealed gap will condense moisture when 55°F air passes through. Our 90-Day Done Right Promise means if condensation returns, we come back at no charge. Call (844) 685-6342 to schedule - estimates are free.
Ready to fix your duct system right? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for upfront pricing and a free estimate. We’ll inspect with a camera, show you exactly what we found, and give you one honest price before we start. Most Houston jobs finish in a single visit, and every repair is backed by our 90-Day Done Right Promise in writing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Houston since 1984.