Fast, Reliable Duct Repair & Sealing Across Selma
Most Selma homeowners don’t think about their ducts until a bedroom stops cooling or the dust won’t quit. We’re Bellows Air Duct & Vent Co. of Texas, and we’ve been driving out to the 78154 area from our Houston base for over 42 years. If you’re in one of the subdivisions off Lookout Road or near the I-35 corridor, we can usually have a technician there same day. Call (866) 347-2063 and you’ll reach a live person, not a voicemail tree.
Our Duct Repair & Sealing team knows the local housing stock. Selma’s homes are overwhelmingly 2000s and 2010s slab-on-grade builds with flex-duct runs through unconditioned attics. That construction era means a lot of those systems are hitting their first major repair cycle right now. The extreme attic heat, the caliche dust from nearby commercial construction, and the near-constant cooling load create failure patterns we see nowhere else in our service territory.
Why Bellows Air Duct & Vent Co. of Texas Is Selma’s Preferred Duct Repair & Sealing Company
We’ve earned our reputation in Selma by showing up when we say and fixing what others miss. Our technicians carry camera inspection equipment on every truck, so we document the condition of your ductwork before we touch it and again when we’re done. That visual record protects both of us.
Our 90-Day Done Right Promise applies to every job in Selma. If something isn’t right, we return at no charge. No paperwork to file, no arguments. Wade Kellerman put that guarantee in place when he took over operations, and it’s non-negotiable.
Calls to our office are answered by a live person 24 hours a day. Most Selma repairs are completed in a single visit by background-checked, uniformed technicians. We disclose pricing before any work begins, so the number you hear on the phone matches the number on your invoice.
We also offer a $50 discount on any repair over $250, free second opinions on written estimates from other companies, and a permanent 5% discount for seniors and veterans.
Our Duct Repair & Sealing Services in Selma
Duct Sealing
Sealing is often the most cost-effective repair for Selma homes. We use professional-grade mastic sealant and metal-backed tape to close gaps at joints, plenum connections, and register boots. In Selma’s 140°F attics, standard duct tape fails within months. We see this constantly in subdivisions like Retama Ranch and Foster Ridge, where original builder-grade tape has turned brittle and detached. Our sealing work is built to survive those conditions.
Flex Duct Repair
The flex-duct systems in Selma’s 2000s-era homes weren’t designed for two decades of 140°F attic cycling. The inner liner cracks, the insulation compresses, and the connection collars separate. We replace damaged flex runs with new R-8 insulated duct, properly supported to prevent sagging that creates low spots where condensation collects. In homes near the I-35 commercial corridor, we also inspect for caliche dust infiltration that accelerates liner deterioration.
Metal Duct Repair
Some Selma homes, particularly custom builds near Lookout Road, have galvanized steel trunk lines. These develop rust at seams and can separate at drive cleats during our intense cooling seasons. We repair metal duct with proper sheet-metal patches, sealed with mastic, not tape. When a trunk line has multiple failure points, we’ll give you honest guidance on whether repair or replacement makes more sense.
Duct Insulation
Adding or replacing insulation on existing ductwork is critical in Selma. Uninsulated or poorly insulated supply lines in a 140°F attic lose enormous cooling capacity before the air ever reaches your rooms. We use formaldehyde-free insulation wraps rated for high-temperature applications, properly sealed at all seams.
Mastic Sealant Application
Mastic is our preferred sealing material for most Selma repairs. It’s a thick, fiber-reinforced compound that remains flexible after curing, bridging gaps up to 1/4 inch. Unlike tape, it doesn’t degrade in UV light or extreme heat. We brush-apply mastic to all longitudinal seams, transverse joints, and register connections, then verify with post-repair camera inspection.
Air Leak Repair
Air leaks in Selma homes often originate outside the duct system itself. Unsealed plumbing chases, electrical penetrations, and top-plate gaps in slab construction pull attic air and exterior dust directly into the return path. We identify these bypass routes during our inspection and seal them properly, not just the duct leaks they create.
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 Selma
Our trucks carry parts and materials from Rotobrush, Nikro, Honeywell, and Aprilaire, the same brands serious HVAC contractors specify for their own homes. That means most Selma repairs don’t wait on parts orders. We stock flex-duct in common diameters, mastic compounds rated for extreme attic temperatures, and replacement collars and boots that match the original installations in local subdivisions. When we leave your home, the repair is finished.
Common Duct Repair & Sealing Problems We See in Selma Homes
- Unsealed plumbing chase penetrations pull caliche dust into returns. The 2000s-era slab construction throughout Selma commonly left gaps around plumbing chases that connect directly to the return-air path. Even with windows closed, fine alkaline dust from the I-35 corridor construction zone circulates continuously into these openings.
- Extreme attic heat separates flex-duct connections. Selma attic temperatures regularly exceed 140°F from May through September. That thermal cycling degrades the adhesive on connection collars and causes duct-board joints to open, creating leaks that pull in attic insulation fibers and contaminants.
- Nine-month cooling seasons compound small leaks into major energy loss. A duct system that runs constantly from March through November never gets a rest period. Minor separations that might self-stabilize in milder climates instead grow progressively worse, distributing cooling unevenly and forcing the compressor to overwork.
- Mountain cedar pollen embeds in duct liner and restricts airflow. Selma’s December-through-February pollen season loads return grilles with ultra-fine particles that bypass standard filters and accumulate on duct surfaces. This buildup narrows effective duct diameter and creates persistent allergy symptoms homeowners often blame on other causes.
Pricing for Duct Repair & Sealing in Selma, TX
Here’s what duct repair and sealing costs in the Selma market right now:
| Service | Typical Range in Selma |
|---|---|
| Mastic sealing of accessible joints (per system) | $280-$450 |
| Flex duct repair / section replacement (per run) | $180-$340 |
| Metal duct patch and seal | $220-$380 |
| Return plenum repair with chase sealing | $340-$520 |
| Full duct insulation wrap (per system) | $680-$1,100 |
Actual cost depends on attic accessibility, the extent of damage our camera inspection reveals, and whether we find multiple failure points that need addressing together. We disclose the full price before any work begins. Estimates are free, and we honor our $50 discount on repairs over $250. Call (866) 347-2063 for an exact quote on your home.
We Also Serve Cities Near Selma
Our technicians regularly work in Selma and the surrounding communities. If you’re in Schertz, Universal City, Cibolo, or Converse, the same response standards and pricing apply. We know the Northeast San Antonio metro construction patterns and climate conditions across all these markets.
Serving Selma, TX - Our Local Coverage Area
We’re based in the Selma 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 Selma
Unsealed plumbing chase penetrations in your slab foundation are likely pulling caliche dust and attic insulation fibers directly into the return-air path, bypassing your filter entirely. We see this in nearly every 2000s-era subdivision from Retama Ranch to Woodland Hills. Our camera inspection locates these bypass routes, and we seal them with mastic at the source. Call (866) 347-2063 for a free inspection and exact repair quote.
The ultra-fine pollen from December through February loads your return grilles and embeds in flex-duct liner, gradually restricting airflow and recirculating allergens even when outdoor pollen counts drop. Standard filters don’t catch these particles. We remove built-up pollen during duct cleaning and can recommend upgraded filtration compatible with your system. For persistent issues, call (866) 347-2063 and we’ll assess whether duct liner replacement is warranted.
Repair makes sense when damage is localized, typically 1-2 runs with separated collars or cracked liner, and the remaining ductwork tests tight. Replacement is the better investment when multiple runs show degradation, insulation is compressed throughout, or your system is over 15 years old and approaching end of life. We give honest guidance based on camera findings, not sales pressure. Our $50 repair discount applies to qualifying jobs over $250.
Yes. In Selma’s climate, duct leaks are the most common cause of uneven cooling and excessive runtime. Leaks in the attic pull in 140°F air, forcing your system to work harder to deliver the same cooling. We measure static pressure and airflow before and after repair to document improvement. Most sealing jobs reduce runtime noticeably within the first billing cycle. Call (866) 347-2063 for same-day diagnosis.
We can usually reach Selma homes the same day you call, and often within a few hours for urgent issues like complete airflow loss or visible duct separation. Our technicians carry materials for common repairs on every truck. Call (866) 347-2063 and a live person will confirm availability and dispatch time for your address.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving Selma and Northeast San Antonio since 1984.