Fast, Reliable Duct Repair & Sealing Across Lewisville
Duct repair and sealing in Lewisville typically costs $280-$650 for most residential jobs, with same-day or next-day service available throughout the 75029, 75057, 75067, and 75077 ZIP codes. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to Lewisville from our Los Angeles headquarters to serve Texas homeowners for over 42 years. Our Duct Repair & Sealing team knows the difference between a Castle Hills build from 2005 and a 1978 ranch near Old Towne - and we treat them differently, because they are different. Call (844) 685-6342 for a free estimate, and we’ll show you exactly what your ducts look like inside before we quote a single repair.
Why Bellows Air Duct & Vent Co. Is Lewisville’s Preferred Duct Repair & Sealing Company
We’ve earned our reputation in Lewisville one house at a time. Our technicians have repaired duct board in the 75057 neighborhoods near Fox Avenue, replaced collapsed flex-duct in lakeside 75067 attics, and sealed metal seams in ranch homes off Main Street that were losing 25 percent of their conditioned air to the crawlspace. Lewisville homeowners call us back because we answer the phone 24 hours a day with a live person, not a menu tree.
Our 90-Day Done Right Promise applies to every Lewisville job. If the seal doesn’t hold, if the repair fails, if you’re not satisfied, we return at no charge. No paperwork to file, no arguments. That’s been our policy since 1984, and it’s why we’re still here when discount operators have come and gone.
Every technician who enters your Lewisville home is background-checked and uniformed. Most repairs are completed in a single visit. And every job starts with a camera inspection, so you see what we see before we lift a tool.
Our Duct Repair & Sealing Services in Lewisville
Duct Sealing
Sealing is often the smartest first move for Lewisville’s older homes. In the 1970s and 1980s builds that dominate 75057 and 75067, metal duct seams were taped with products that degrade after 30 years. We’ve found original tape crumbling to dust in attics near Old Towne Lewisville, blowing conditioned air straight into the insulation instead of the living room. Our crew removes the failed tape and applies mastic sealant by hand at every joint, then pressure-tests the system to verify the seal. A typical Lewisville duct sealing job runs $280-$450 for a single-system home.
Flex Duct Repair
Flex duct doesn’t last forever, especially in Lewisville’s lake-proximity climate. The original uninsulated flex runs installed during the 1975-1995 buildout absorb attic moisture and sag, kink, or collapse entirely. We recently repaired a 1979-era flex-duct system in a home off Fox Avenue in 75057 where the original uninsulated supply runs had collapsed due to attic condensation from Lake Lewisville humidity, replaced with R-8 insulated flex duct and sealed with mastic at all takeoffs. That R-8 insulation is critical here - it prevents the summer night condensation that ruins uninsulated runs in lakeside neighborhoods. Flex duct repair in Lewisville typically runs $180-$340 per run, with full replacement at $220-$420 per run depending on attic accessibility.
Metal Duct Repair
Galvanized metal ducts in Lewisville’s older homes corrode at seams and develop pinholes that whistle and waste energy. We patch small breaches with sheet metal and mastic, or replace damaged sections when the metal itself has thinned. In homes near Main Street and Civic Circle, we’ve found metal trunk lines from the late 1970s that are structurally sound but leaking at every joint - a full mastic seal restores performance without the cost of replacement. Metal duct repair in Lewisville ranges from $200 for spot patching to $550 for section replacement in difficult attic spaces.
Duct Insulation
Here’s where Lewisville’s geography becomes unavoidable. Lake Lewisville’s evaporation keeps relative humidity elevated through summer nights, and that moisture condenses on poorly insulated duct surfaces in attic spaces. We’ve measured condensation on uninsulated flex-duct connections in 75067 that was literally dripping onto ceiling drywall. We wrap existing metal ducts with formaldehyde-free fiberglass insulation or replace uninsulated flex with R-8 product. Duct insulation in Lewisville typically costs $320-$580 depending on linear footage and attic conditions.
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 Lewisville
We stock parts and materials from Honeywell, Aprilaire, and Nikro - the same brands serious HVAC contractors specify for their own homes. For Lewisville customers, that means no waiting on a parts run to Dallas or Fort Worth. Our trucks carry mastic sealant, R-8 flex duct, insulation wrap, and metal fittings sized for the residential systems common in Lewisville’s housing stock. When we find a Honeywell zone damper failing in a Castle Hills home or Aprilaire media filters clogged in a 75067 lakeside ranch, we fix it that day.
Common Duct Repair & Sealing Problems We See in Lewisville Homes
- Original duct board delaminates during cleaning. In Lewisville’s 75057 neighborhoods near Old Towne, duct board from the late 1970s has foil facings that separate from fiberglass when suction is applied, requiring hand-inspection of every joint before using any powered equipment. Our technicians calibrate negative pressure carefully to avoid collapsing deteriorated sections.
- Uninsulated flex-duct connections in lakeside 75067 attics sweat summer moisture. The lake’s evaporation keeps humidity high through the night, and that condensation pools in low spots of uninsulated flex runs, causing microbial growth that necessitates replacement and sealing with mastic.
- Aged metal duct seams in 1970s homes near Old Towne have loose tape that leaks air. Original pressure-sensitive tape dries and falls away after 40 years, wasting HVAC efficiency and requiring full mastic sealing at every joint to restore system balance.
- Attic condensation on poorly insulated connections during North Texas cedar pollen season. From December through February, Lewisville residents seal windows and run heat continuously, pulling heavy allergen loads through compromised ductwork while the lake’s moisture condenses on cold duct surfaces overhead.
Pricing for Duct Repair & Sealing in Lewisville, TX
We’re upfront about numbers because that’s how a square deal works. Here’s what duct repair and sealing costs in Lewisville’s market:
- Duct sealing with mastic (typical single system): $280-$450
- Flex duct repair (per run): $180-$340
- Flex duct replacement with R-8 insulated product (per run): $220-$420
- Metal duct spot repair/patching: $200-$320
- Metal duct section replacement: $380-$550
- Duct insulation wrap (per linear foot): $8-$14
- Full duct system inspection with camera: $89-$149 (credited toward repair)
What moves the price? Attic accessibility, the condition of existing materials, and whether we’re working in a tight 1978 crawlspace near Old Towne or a spacious modern attic in Castle Hills. We show you the camera footage before we quote, and the price we state is the price on the invoice. No bait, no changes at the door. Ask about our $50 Off Any Repair Over $250, or our Free Second Opinion on Any Written Estimate if another company has already quoted you.
We Also Serve Cities Near Lewisville
Our Lewisville crew covers Highland Village to the north, Flower Mound to the west, Coppell to the south, and Corinth to the east. Same live-answer phone line, same camera inspection, same 90-Day Done Right Promise. If you’re in a lakeside community between Lewisville and Highland Village, you face the same humidity challenges we see in 75067 - and we know how to fix them.
Serving Lewisville, TX - Our Local Coverage Area
We’re based in the Lewisville 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 Lewisville
We can often repair 1978 duct board if the fiberglass substrate is still structurally intact and the foil facing hasn’t fully separated. Our technician will hand-inspect every accessible joint before running any powered equipment, then patch small separations with mastic and reinforcement tape. If the board is crumbling or shedding fibers into the airstream, replacement is the safer route. Call (844) 685-6342 and we’ll camera-inspect it for $89, credited toward any repair.
Lake Lewisville’s evaporation keeps ambient humidity measurably higher than inland suburbs like Plano or McKinney, and that moisture condenses on any duct surface that drops below the dew point. Winter nights in 75067 still produce attic temperatures low enough to chill uninsulated or poorly insulated duct connections, especially when heat pumps cycle into defrost mode and supply air temperature drops temporarily. R-8 insulated flex duct and proper mastic sealing at every takeoff eliminates the condensation source.
We find more moisture damage and microbial growth in lakeside 75067 than in Old Towne specifically, but Old Towne’s 1970s duct board presents a different problem - physical delamination that releases fiberglass fibers rather than mold. Castle Hills and 75077 builds from the 2000s typically have better-insulated, better-sealed systems with fewer issues overall. The lake-proximity effect in 75067 is the dominant local factor for biological growth.
Sealing is worth it if the metal itself is sound - no corrosion holes, no structural sagging, no asbestos-containing insulation wrap. In Lewisville’s 1970s homes, we often find galvanized trunk lines that will last another 20 years once properly sealed with mastic. Replacement becomes necessary when metal has thinned from condensation corrosion or when previous repairs have compromised structural integrity. We’ll show you the camera footage and give you both options with real numbers.
Usually yes, if the crawlspace access is adequate and the collapsed section is reachable. We pull new R-8 insulated flex through the existing chase, connect it with mechanical fasteners and mastic, and seal the vapor barrier at the penetration. In Lewisville’s older homes with narrow 1970s crawlspaces, we sometimes need to create a small access panel in a closet or utility room - we discuss that before cutting anything, and we patch it clean. Call (844) 685-6342 for a free estimate - we’ll tell you exactly what access we’ll need.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Lewisville since 1984.