Fast, Reliable Duct Repair & Sealing Across Dallas
Duct repair and sealing in Dallas typically costs $280-$750 for most residential jobs, with in-slab repairs running higher at $900-$1,800. We’re usually on-site within 2-4 hours for Dallas calls, same day for standard bookings. Call (866) 347-2063 for a free estimate with upfront pricing.
We’ve been driving to Dallas from our Houston headquarters for over 42 years, and we know the city’s duct problems aren’t the same as Houston’s or Austin’s. The Blackland Prairie’s black clay heaves beneath slab-on-grade homes in Oak Cliff and South Dallas. Attic temperatures in July and August cook flex duct tape to failure. And the 1970s retrofit systems we find in 75203, 75208, and 75210 were often installed with materials that weren’t meant to last half a century. Our Duct Repair & Sealing team treats Dallas as a distinct service territory with its own failure patterns, not a generic metro area.
When a Dallas homeowner calls us, they’re often dealing with one of three scenarios: a 1960s ranch with original in-slab ductwork that’s cracked from soil movement, a 1970s wood-frame with flex duct that’s finally delaminated in a 150°F attic, or a newer Uptown build with shared air handlers and access complications. We bring camera inspection equipment, mastic sealant rated for Texas heat, and replacement flex duct from Nikro and Rotobrush-compatible cleaning systems. Most jobs finish in one visit.
Why Bellows Air Duct & Vent Co. of Texas Is Dallas’s Preferred Duct Repair & Sealing Company
Our reputation in Dallas was built the slow way: one honest job at a time, no bait coupons, no price changes at the door. Homeowners in Richardson and Irving refer us to family in Lakewood and Kessler Park because the number we quote on the phone matches the invoice. That’s been our practice since 1984.
Wade Kellerman has led this company since its founding, and his name is on every 90-Day Done Right Promise we issue in Dallas. If the work isn’t right, we return at no charge. No paperwork, no arguing. It’s stamped on every job.
Calls to our office reach a live person 24 hours a day, not voicemail, not an app. For Dallas residents, that means real scheduling when you need it, real answers about whether your cracked in-slab chase can be sealed or needs rerouting, and real confirmation that your technician is background-checked and uniformed before he rings your bell.
We know Dallas’s permit environment, the access challenges of shared HVAC in Uptown conversions, and which Oak Cliff slab homes are likely to have the original 1960s galvanized trunk lines. That local knowledge saves time and prevents callbacks.
Our Duct Repair & Sealing Services in Dallas
Duct Sealing
Dallas’s 8-to-9-month cooling season means systems run nearly continuously, and every leak in your ductwork is conditioned air you’re paying to cool your attic. We seal with mastic compound rated for sustained 140°F+ attic exposure, not duct tape that’ll melt off by August. A typical duct sealing job in Dallas runs $280-$450 for a single system, $500-$750 for larger homes with multiple air handlers. We camera-inspect before and after so you see the difference.
Flex Duct Repair
The flex duct installed in Dallas’s 1970s retrofits is now 40-50 years old. In neighborhoods like South Dallas and parts of East Dallas, we regularly find flex that’s collapsed under its own weight, with the inner liner delaminated and blowing fiberglass particles into supply air. We replace collapsed sections with new insulated flex, secure with mechanical fasteners and mastic, and verify with camera. Flex duct repair in Dallas typically costs $180-$340 per section, depending on attic access.
Metal Duct Repair
Older Dallas homes, especially in 75203 and 75208, sometimes have original galvanized steel trunk lines from 1970s retrofits. These corrode at seams and can separate at joints from decades of vibration and clay soil movement transmitted through slab foundations. We repair with sheet metal patches, seal with mastic, and reinforce structurally. Metal duct repair in Dallas generally runs $320-$580.
Duct Insulation
When Dallas attic temperatures exceed 140°F from June through August, uninsulated or degraded duct insulation means 15-20% cooling loss before air reaches your vents. We install foil-faced fiberglass insulation or closed-cell wrap where appropriate, sealed at every seam. Duct insulation in Dallas typically costs $400-$900 depending on linear footage and accessibility.
What happens when you call
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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.
Trusted Brands We Service in Dallas
We stock parts and materials from Rotobrush, Nikro, Honeywell, and Aprilaire - the same brands serious HVAC contractors specify for Texas installations. For Dallas customers, that means no waiting on a parts run to Houston when your flex duct repair needs a specific diameter or your air handler needs a Honeywell-compatible sealing collar. We carry common flex duct sizes, mastic compounds rated for sustained high-temperature exposure, and camera inspection heads small enough for the restricted access in Uptown’s converted loft buildings. Most Dallas jobs complete in a single visit because our trucks are loaded for what we know we’ll find.
Common Duct Repair & Sealing Problems We See in Dallas Homes
- Clay soil cracks in-slab duct chases. In Oak Cliff’s 75208 neighborhood and similar post-war slab developments, the Blackland Prairie’s expansive clay heaves and contracts with wet-dry cycles, cracking concrete duct chases and pulling soil, moisture, and pests directly into the supply system. Surface cleaning alone won’t fix this - the chase must be sealed or rerouted.
- Attic heat melts duct tape at every joint. Dallas attic temperatures from June through August routinely reach 140-150°F, which degrades the adhesive on standard duct tape within 2-3 cooling seasons. We regularly find ductwork that looks intact from the vent register but is completely open to attic air at every connection point above.
- 1970s flex duct delaminates and collapses. The first-generation flex duct installed when central air was retrofitted into Dallas’s 1940s-1960s housing stock has exceeded its design life. The inner liner separates from the insulation wrap, the wire helix corrodes, and sections collapse to block airflow entirely.
- Shared air handlers in Uptown conversions complicate sealing scope. Buildings in 75204 and 75206 converted to residential use often have one air handler serving multiple units. Sealing one unit’s ductwork requires coordination with building management and precise isolation - work we scope with camera inspection before quoting.
Pricing for Duct Repair & Sealing in Dallas, TX
We’re transparent about costs because we’ve seen what bait-and-switch pricing does to trust. Here’s what duct repair and sealing actually costs in the Dallas market:
| Service | Typical Range in Dallas |
|---|---|
| Duct sealing (mastic, single system) | $280-$450 |
| Duct sealing (multi-system or large home) | $500-$750 |
| Flex duct repair (per section) | $180-$340 |
| Metal duct repair | $320-$580 |
| Duct insulation | $400-$900 |
| In-slab duct chase sealing/repair | $900-$1,800 |
What moves the number: attic accessibility (crawl vs. walk-in), extent of damage found on camera inspection, whether materials need to be rated for Dallas’s extreme attic heat, and whether we’re working in a single-family home or a multi-unit building with shared equipment. We disclose the full price before lifting a single tool. No surprises on the bill.
Standing offers for Dallas customers: $50 off any repair over $250, free second opinion on any written estimate, $89 seasonal tune-up, and a permanent 5% senior and veteran discount. Call (866) 347-2063 for your exact quote - estimates are free.
We Also Serve Cities Near Dallas
Our Duct Repair & Sealing in Dallas coverage extends to Highland Park, University Park, Richardson, and Irving. Same trucks, same technicians, same upfront pricing and 90-Day Done Right Promise. Whether you’re in a 1950s Highland Park ranch with original metal ductwork or a newer Irving build with flex duct showing early wear, we diagnose with camera inspection and quote before starting work.
Serving Dallas, TX - Our Local Coverage Area
We’re based in the Dallas 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 Dallas
Soil in your vents almost always means a cracked in-slab duct chase, and in Dallas it’s specifically the Blackland Prairie’s expansive clay soil causing the damage. The clay heaves when wet and shrinks when dry, cycling through stress that cracks concrete duct chases in slab-on-grade homes, particularly in Oak Cliff’s 75208 ZIP and similar 1960s-1970s neighborhoods. Once the chase is cracked, it pulls soil, moisture, and sometimes pests directly into your supply air. We seal the chase with mastic rated for soil contact, replace any collapsed downstream duct, and camera-verify the repair. Call (866) 347-2063 - we’ll inspect and quote at no charge.
Yes, duct sealing often reduces cooling costs 15-25% in older Dallas homes, but only if the ductwork itself is intact enough to seal. Many 1950s Dallas homes received central air retrofits in the 1970s with undersized galvanized trunk lines or early flex duct that’s now failing. We camera-inspect first. If the duct is structurally sound, mastic sealing of joints and connections typically costs $280-$450 and pays back in 1-2 cooling seasons. If the duct is delaminated or corroded, repair or replacement is the honest recommendation. Call (866) 347-2063 for a free inspection and straight answer.
Dallas summers make duct repair more urgent and more technically demanding. Attic temperatures above 140°F mean technicians work in short rotations for safety, and materials must be rated for sustained high-heat exposure - standard duct tape fails in weeks, and some mastic compounds degrade. We schedule Dallas attic work early morning when possible, use heat-rated materials, and never leave a system open overnight during peak cooling season. Emergency service is available. Call (866) 347-2063 if you’ve lost cooling due to a collapsed or disconnected duct.
Yes, but shared systems in Uptown’s converted loft buildings require coordination and precise isolation. We camera-inspect to map which duct branches serve your unit, install temporary isolation dampers where needed, and seal only your scope. Building management notification is usually required, and we quote only after inspection - typically $400-$700 for single-unit sealing in a shared system. We’ve worked in multiple Uptown and East Dallas conversions and understand the access constraints. Call (866) 347-2063 to schedule.
Cracked in-slab duct repair in Dallas typically runs $900-$1,800, with most jobs landing near $1,200. The range depends on chase length, whether we can seal in place or must reroute above slab, and how much soil and moisture intrusion has damaged downstream flex duct. This is not a surface cleaning job - the chase must be structurally sealed or abandoned and replaced. We camera-inspect, quote upfront, and complete most in-slab repairs in one day. Call (866) 347-2063 for a free estimate.
In Oak Cliff’s 75208 neighborhood, we repaired a 1960s slab home where the original in-slab duct chase had cracked from clay heave, pulling soil and moisture into the supply plenum. We sealed the chase with mastic, replaced a collapsed flex duct section, and installed a Rotobrush-based cleaning to remove the accumulated debris. The homeowner’s airflow improved immediately, and the musty smell was gone. That’s the kind of fix we stand behind - no paperwork, no arguing, for 90 days and beyond.
Ready to get your Dallas home’s ductwork inspected? Call Bellows Air Duct & Vent Co. of Texas at (866) 347-2063. We’ll answer live, schedule at your convenience, and show you exactly what we find before quoting a single dollar. Done right - and backed in writing for 90 days.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving Dallas since 1984.