Fast, Reliable Duct Repair & Sealing Across Seguin
Most Seguin homeowners who call us have lived in the same house for twenty years or more, and they’re tired of rooms that never cool evenly, utility bills that climb every summer, and companies that quote one price on the phone and another at the door. We’re Bellows Air Duct & Vent Co., and our Duct Repair & Sealing team has been driving out to Seguin from Houston for over 42 years. We answer our phones live, 24 hours a day, at (866) 347-2063. Most repairs in the 78155 and 78156 ZIP codes are completed in a single visit, and we show you the exact price before we touch a single tool.
Why Bellows Air Duct & Vent Co. of Texas Is Seguin’s Preferred Duct Repair & Sealing Company
Seguin isn’t a generic market to us. We know the pre-1960s bungalows near the historic downtown corridor where original metal ductwork has never been professionally sealed. We’ve worked the 1970s tract homes off Kingsbury Street where flex duct sags and collapses. Wade Kellerman, who leads our company, has built our reputation on one principle: the job is done right, or we return and make it right with no paperwork and no argument. That’s our 90-Day Done Right Promise, and it’s stamped on every invoice we write in Seguin.
Our technicians are background-checked and uniformed, and they carry professional-grade equipment from Rotobrush and Honeywell, the same brands serious HVAC contractors specify for their own homes. Every job gets a camera inspection before and after, so you see what we see, not just take our word for it. When you call (866) 347-2063, a live person answers, not a voicemail tree or an app.
We understand the access constraints that come with Seguin’s older neighborhoods, tight lot clearances, and homes built before modern HVAC standards. Our trucks are stocked for same-day completion, and we schedule around your availability, not ours.
Our Duct Repair & Sealing Services in Seguin
Duct Sealing
Unsealed duct seams are a money drain, and in Seguin they’re worse than most places. The Guadalupe River’s persistent humidity seeps into crawlspaces and attics, condensing on cool metal surfaces inside leaky ducts. We seal metal and flex systems with mastic sealant and mechanical fasteners, pressure-testing afterward to verify results. In a typical Seguin home, proper sealing cuts conditioned air loss by 20-30 percent, which matters when you’re running AC from March through October.
Flex Duct Repair
The 1970s and 1980s tract homes scattered through 78155 are filled with aging flex duct that wasn’t built to last forty years. The material sags, traps debris, and collapses at connection points, especially where Seguin’s pecan canopy drops catkin debris that adds weight and blocks airflow. We repair partial spans or replace entire runs, securing them with proper supports so they stay pitched correctly for drainage and airflow. Our repairs are camera-verified before we leave.
Metal Duct Repair
Original metal ductwork in Seguin’s historic homes near East College Street and the downtown corridor can be salvaged in most cases. Rust-hole leaks from internal condensation are the usual failure mode, caused by unsealed seams pulling humid Guadalupe River air into the system. We cut out damaged sections, weld or mechanically join replacements, and seal the entire run with mastic. Replacement is rarely necessary unless the duct has structurally failed.
Duct Insulation
Insulation matters in Seguin’s climate more than drier parts of Texas. When cool air moves through uninsulated trunk lines in a hot attic or humid crawlspace, condensation forms on the exterior, drips onto framing, and breeds mold. We install closed-cell insulation on repaired and sealed ducts, particularly on north- and east-facing returns where shaded conditions keep surfaces cooler and wetter longer.
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 Seguin
We carry Rotobrush agitation equipment and Honeywell air quality components on every truck serving Seguin, and we stock mastic sealant and flex duct materials sized for the residential systems common in 78155 and 78156. That means no waiting on parts for standard repairs. For homes with specialized components, we source from Nikro and other professional-grade suppliers with next-day availability to Houston. Our technicians are trained on the specific pressure requirements and joint configurations of each brand, so the repair is done once and done correctly.
Common Duct Repair & Sealing Problems We See in Seguin Homes
- Pecan catkin plugs in shaded returns. Homes with north- or east-facing returns under Seguin’s dense pecan canopy pull enormous quantities of catkin debris each April and May. The material mats green at the first duct joint, blocking airflow and creating a nutrient base for mold once humidity rises. Sealing the return box and first duct section prevents this buildup from entering the system.
- Rust-hole leaks in pre-1960s metal ducts. Original metal ductwork near downtown Seguin was never sealed to modern standards. Guadalupe River humidity condenses inside, rusting from within until pinholes become gaping leaks. We find this regularly in homes off Court Street and Travis Street where crawlspace ventilation is poor.
- Collapsed flex duct in 1970s-1980s tract homes. The aging flex runs in subdivisions built during Seguin’s growth period have exceeded their design life. Sagging creates low spots where debris and moisture collect, and the connection collars separate under weight. Full span replacement is often the only lasting repair.
- Condensation on uninsulated trunk lines. Seguin’s combination of high humidity and long cooling seasons means uninsulated ducts in attics sweat continuously through summer. The moisture damages ceilings, breeds mold, and reduces system efficiency. Insulation after sealing is essential, not optional.
Pricing for Duct Repair & Sealing in Seguin, TX
We’re plain about costs because we’ve seen what bait-and-switch pricing does to homeowners who’ve already been burned once.
| Service | Typical Range in Seguin |
|---|---|
| Duct sealing (whole system, mastic) | $450 - $850 |
| Flex duct repair (partial span) | $280 - $520 |
| Flex duct replacement (full span) | $380 - $720 |
| Metal duct repair (section replacement) | $340 - $680 |
| Duct insulation (trunk line) | $320 - $580 |
| Air leak repair (single location) | $180 - $340 |
Actual cost depends on accessibility, material type, and how far the damage has spread. A 1950s bungalow with original metal duct in a tight crawlspace takes longer than a 1990s ranch with open attic access. We inspect with a camera, show you exactly what we found, and give you the full price before we start. No changes at the door. Our standing offers include $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Call (866) 347-2063 for your free estimate.
We Also Serve Cities Near Seguin
Our technicians regularly work Duct Repair & Sealing in Seguin and the surrounding communities, including New Braunfels to the north, Cibolo and Schertz to the west, and Selma to the northwest. The same 90-Day Done Right Promise, upfront pricing, and camera-verified results apply in every city we serve.
Serving Seguin, TX - Our Local Coverage Area
We’re based in the Seguin 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 Seguin
Yes, it does. The density of pecan catkin debris in Seguin is unique to this area, and it requires more aggressive sealing of return boxes and first duct sections to prevent matting and mold growth. We use mastic sealant on every joint and collar, not just tape, because tape fails under the organic load Seguin returns experience each spring. Call (866) 347-2063 if you’re seeing reduced airflow after April, and we’ll inspect with a camera at no charge.
In most cases, yes. Original metal ductwork in Seguin’s historic homes is thicker-gauge material than modern equivalents, and if the structure is sound, we repair rust holes and seal seams with mastic for a permanent fix. We replace only sections that have structurally failed from internal rust. Our camera inspection shows you the exact condition before you decide. Estimates are free, and we honor our $50 off repair over $250 offer on qualifying work.
Mountain cedar pollen from December through February deposits heavy allergen loads into duct systems, and any unsealed joint or leak pulls that pollen directly into your living space. Sealed ducts contain the allergen load to the filter, which you can change. Unsealed ducts distribute it through every room. If your allergies spike in late winter, duct leaks are likely the cause. Call (866) 347-2063 for a pressure test.
Yes, significantly. Sealing prevents humid outside air from entering the duct system, which reduces condensation on cool surfaces and lowers the moisture available for mold growth. In Seguin’s Guadalupe River corridor, this is especially important for homes with crawlspace or basement returns. We pair sealing with proper insulation to control surface temperature and eliminate the conditions that breed mold. Free estimates are available by calling (866) 347-2063.
Uneven temperatures between rooms, weak airflow at distant vents, musty odors when the system runs, and visible sagging or damage in accessible areas are all clear indicators. In Seguin’s 1970s-1980s housing stock, flex duct has typically exceeded its 25-year design life and is collapsing at connection points under accumulated debris weight. We inspect with a camera, show you the damage, and quote the repair before we begin. Our 90-Day Done Right Promise covers all flex duct work.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving Seguin since 1984.