Fast, Reliable Duct Repair & Sealing Across Rendon
Duct repair and sealing in Rendon, TX typically costs $180-$650 depending on whether we’re sealing joints with mastic or replacing collapsed flex runs, and most jobs are completed in a single visit. If you’re noticing uneven cooling, dust blowing from vents, or rooms that never reach temperature, the problem is often in your attic ductwork, not your AC unit.
We’ve been driving out to Rendon from our Houston office for over 42 years, and we know the 76140 area well - from the subdivisions off Rendon Road to the newer builds near the Kennedale border. Our background-checked, uniformed technicians usually arrive within our standard response window, and because we stock Rotobrush equipment and common flex-duct sizes on every truck, we don’t need to come back twice. Call (866) 347-2063 - a live person answers, 24 hours a day.
Why Bellows Air Duct & Vent Co. of Texas Is Rendon’s Preferred Duct Repair & Sealing Company
Rendon homeowners aren’t looking for the lowest coupon. They’re looking for someone who shows up when they say, does what they promised, and doesn’t invent problems in the attic. That’s been our approach since 1984.
Our Duct Repair & Sealing in Rendon work is backed by the 90-Day Done Right Promise - in writing, no paperwork required if something needs adjusting. Every job starts and ends with a camera inspection, so you see what we see: disconnected plenums, kinked flex, or failed tape seals. No claims without proof.
We answer our own phones. Not a call center, not an app. When you call (866) 347-2063, you reach a live person who can dispatch a technician, check availability, and give you upfront pricing before anyone picks up a tool. Most Rendon calls are scheduled same-day or next-day.
Our technicians are background-checked and uniformed, and they carry the same professional-grade equipment - Nikro negative air machines, Rotobrush brushing systems, Honeywell and Aprilaire testing gear - that serious HVAC contractors specify for their own jobs. We don’t send a salesman with a flashlight.
Our Duct Repair & Sealing Services in Rendon
Mastic Sealant Application
Mastic is the only permanent sealant we use on duct joints in Rendon. Foil tape fails predictably in 140°F attics, and Rendon’s extreme temperature swings - from winter freezes to summer heat that cooks attic spaces - make that failure faster. We brush on fiber-reinforced mastic at every plenum connection, register boot, and longitudinal seam. It hardens to a rubberized gasket that flexes with the duct but won’t peel. On a typical 1,800 square foot Rendon home, mastic sealing runs $280-$450 and takes about three hours. The result is tested with a duct blaster or pressure pan - we show you the before-and-after leakage numbers.
Flex Duct Repair
This is where Rendon’s geography becomes the job. Rendon sits on Blackland Prairie clay that swells when wet and shrinks dramatically during drought. That slab movement pulls flex ducts away from plenums and register boots - a failure we see far less often in Mansfield, where the sandy loam is more stable. On a 2003 tract home near Rendon Road, our crew found the entire supply trunk had disconnected from the plenum after a dry summer, dumping attic air into the living room. We reattached it with mastic sealant and Rotobrush-cleaned the sagging flex runs, restoring airflow to the south bedrooms. Flex duct repair in Rendon typically runs $180-$340 per run, including reconnection, support strapping, and sealing.
Metal Duct Repair
Older Rendon homes and some custom builds have galvanized metal trunk lines. We repair separated seams, patch rust holes, and replace damaged sections with matching gauge metal. Where metal meets flex - common in 1990s-2000s construction - we transition with sealed collars, never tape alone. Metal repairs in Rendon range from $220 for a simple seam reseal to $650 for section replacement with custom fabrication.
Duct Insulation
Unconditioned attics in Rendon hit 140°F regularly in July and August. That heat degrades the fiberglass wrap and inner liner of flex duct, shedding particles into your airflow and reducing R-value so your cooled air warms before it reaches the room. We install new foil-faced insulation sleeves or replace deteriorated flex entirely, depending on condition. Duct insulation work in Rendon runs $320-$580 for a typical home, and we always verify with our camera that the inner liner is intact before we seal it back up.
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 Rendon
We build our trucks with equipment we’d want in our own homes. That means Rotobrush brushing systems for mechanical cleaning inside duct runs, Nikro negative air machines for controlled debris removal, and Honeywell and Aprilaire testing instruments for measuring airflow, temperature split, and leakage. These are the same brands specified by commercial HVAC contractors, and we stock common repair parts - flex duct, collars, mastic, support strap - so we’re not driving back to a warehouse while your attic stays open. For Rendon homeowners, that means the job starts and finishes in one visit, and the price we quote on the phone is the price on the invoice.
Common Duct Repair & Sealing Problems We See in Rendon Homes
- Flex ducts pulling away from plenums after dry summers. Rendon’s Blackland Prairie clay contracts so severely during multi-year droughts that slabs shift and flex-duct connections separate. Homeowners often call us thinking their AC compressor failed, when it’s actually a disconnected trunk line sitting in a 140°F attic.
- Kinked and sagging 20-year-old flex duct in unconditioned attics. The 1990s-2000s tract homes that dominate 76140 were built with flexible duct systems that are now past their reliable service life. Sagging creates turbulent airflow and condensation points; kinks block supply entirely to one side of the house.
- Foil-tape seals failing at register boots, pulling attic dust into living spaces. Original tape dries and releases in Rendon’s extreme attic heat, creating gaps that suck in blown-in fiberglass insulation, rodent debris, and the fine dust that blows through rural Tarrant County with less urban hardscape to block it.
- Collapsed inner liner shedding particles into airflow. Heat-degraded flex duct liner breaks down and blows white or gray fibers from vents. We see this most in south-facing attic runs where summer temperatures peak earliest and stay highest.
Pricing for Duct Repair & Sealing in Rendon, TX
We’re straightforward about numbers because we’ve seen what the alternative looks like.
| Service | Typical Range in Rendon |
|---|---|
| Mastic sealant, full system | $280-$450 |
| Flex duct repair / reconnection (per run) | $180-$340 |
| Metal duct seam repair or patch | $220-$380 |
| Metal duct section replacement | $450-$650 |
| Duct insulation replacement | $320-$580 |
| Full system inspection with camera | $89 (Seasonal Tune-Up special) |
What moves the price: accessibility of attic space, extent of disconnection or damage, and whether we need to replace versus repair. Every estimate is free, presented in writing before work starts, and honored at that number. We also offer $50 off any repair over $250, a free second opinion on any written estimate you’ve received, and a permanent 5% senior and veteran discount. Call (866) 347-2063 for your exact quote.
We Also Serve Cities Near Rendon
Our Duct Repair & Sealing team covers southern Tarrant County and surrounding communities including Everman, Kennedale, Forest Hill, and Burleson. The same 90-Day Done Right Promise, same upfront pricing, same live-answer phone line applies whether you’re in 76140 or across the county line.
Serving Rendon, TX - Our Local Coverage Area
We’re based in the Rendon 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 Rendon
It physically pulls flex ducts away from plenums and register boots during drought cycles, a failure mode rare on Mansfield’s more stable sandy loam. We inspect every connection with a camera and reattach with mastic, not tape, so the seal survives the next shrink-swell cycle. If you’ve noticed one side of your house stop cooling after a dry summer, this is likely why. Call (866) 347-2063 for a free inspection.
Sometimes yes, sometimes no - we won’t know until we look. If the inner liner is intact and only connections have failed, reconnection and mastic sealing is cost-effective at $180-$340 per run. If the liner is shedding particles or insulation wrap is degraded, replacement is the honest recommendation. We show you the camera footage and let you decide, with no pressure either way. Our $89 Seasonal Tune-Up includes the full inspection.
We use fiber-reinforced mastic sealant for permanent joints, Rotobrush systems for mechanical cleaning inside ducts, and Nikro negative air machines for debris control. For testing and verification, we carry Honeywell and Aprilaire instruments. These are professional-grade tools, not hardware-store substitutes, and they’re on every truck that rolls to Rendon.
Yes. Rendon attics exceed 140°F in summer, which degrades foil tape adhesive in 2-3 years and accelerates breakdown of flex-duct insulation wrap. That’s why we use mastic exclusively - it cures to a solid gasket that doesn’t rely on adhesive - and why we check attic-duct condition on every job. If your seals were done with tape, they’re likely already failing.
They often do. Uneven cooling in 76140 homes is frequently caused by disconnected supply trunks, kinked flex runs, or collapsed sections - all visible on camera and repairable in a single visit. If ductwork is sound and the problem persists, we’ll tell you honestly that the issue is elsewhere. We don’t invent attic problems. Call (866) 347-2063 for a free estimate and camera inspection.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co., serving Rendon since 1984.