Fast, Reliable Duct Repair & Sealing Across Kendall
Duct repair and sealing in Kendall, FL typically costs between $280 and $750 for most residential jobs, with flex duct replacement running higher and simple sealing lower. We’re usually on-site in Kendall within the same day you call, and most repairs finish in a single visit.
Bellows Air Duct & Vent Co. has been driving the western streets of Kendall’s 33156 corridor for over 42 years. We know the area from Dadeland Boulevard out to the edge of the Everglades buffer, and we’ve worked on the exact flex-duct systems that were installed when these neighborhoods were built. If your home still runs original ductwork from the 1970s, 1980s, or 1990s, you’re not alone - and you’re probably losing conditioned air you never knew was escaping. Call us at (844) 685-6342 for a free estimate. We’ll show you what we find with a camera, name an honest price before we start, and back the work with our 90-Day Done Right Promise in writing.
Why Bellows Air Duct & Vent Co. Is Kendall’s Preferred Duct Repair & Sealing Company
We’ve earned our reputation in Kendall one house at a time. Homeowners here don’t want a sales pitch; they want someone who shows up when they say, explains what they found, and fixes it without coming back. That’s what we do.
Our technicians are background-checked and uniformed, and they’ve worked on the specific failure patterns that define this market: collapsed flex-duct liners in the Glenvar Heights area, separated boot connections near 112th Avenue, and mold-colonized plenums in homes that haven’t had their ductwork opened in three decades. We answer our phones 24 hours a day with a live person, not a voicemail tree or an app. And our pricing is disclosed upfront before a single tool is lifted - the number you hear on the phone is the number on the invoice.
Our Duct Repair & Sealing team carries the same professional-grade equipment you’ll find specified by serious HVAC contractors: Rotobrush agitation systems, Nikro HEPA vacuums, and Abatement Technologies containment gear. We don’t subcontract. We don’t bait-switch. And we don’t leave until the camera shows the repair is right.
Our Duct Repair & Sealing Services in Kendall
Flex Duct Repair
This is the service we perform most often in Kendall, and for good reason. The 33156 area is dominated by single-family homes built during the 1970s-1990s suburban boom, and most still run the original fiberglass flex ductwork installed when the house was new. After 30 to 50 years of South Florida humidity cycling, the inner liner degrades, collapses, or separates from boot connections - and because the A/C still blows cold, homeowners never suspect a problem until mold appears or an energy audit reveals the damage.
On a home near 112th Avenue in the Pinecrest pocket, our crew found the original 1980s flex duct had separated from three boots and the inner liner had fully collapsed in a 40-foot run - yet the homeowner reported the A/C “blew cold.” We replaced the collapsed run with insulated metal duct and sealed all connections with mastic, restoring proper airflow and eliminating a hidden mold reservoir. A typical flex duct repair or replacement in Kendall runs $340-$680 depending on linear footage and accessibility.
Duct Sealing
Sealing is often the most cost-effective improvement you can make to an aging duct system in Kendall. We use mastic sealant and professional-grade tapes to close leaks at joints, plenums, and penetrations - the points where your conditioned air escapes into the attic or crawlspace and where humid, mold-laden air gets drawn back in. In Kendall’s climate, where relative humidity stays above 70% most of the year, unsealed ducts don’t just waste energy; they become conduits for biological contamination.
Our sealing process includes a camera inspection before and after, so you see the difference. Most residential duct sealing jobs in Kendall fall between $280 and $520.
Mastic Sealant Application
For joints and connections that see thermal expansion and contraction, mastic outlasts tape by decades. We brush or trowel a thick, fiber-reinforced mastic compound onto every seam and boot connection, creating a permanent seal that won’t degrade in Kendall’s heat and humidity. This is standard on every flex duct replacement we perform, and it’s available as a standalone service for metal duct systems that need reinforcement. Mastic application typically adds $120-$240 to a sealing job, or it’s included in our flex duct replacement pricing.
Metal Duct Repair
Some Kendall homes, particularly larger estate properties in the Pinecrest area and certain Glenvar Heights builds, use galvanized metal trunk lines with flex branch takeoffs. Metal ducts can corrode at seams, separate at drives, or develop holes from contact with roofing nails or rodent activity. We patch, replace sections, and re-seal metal systems using the same mastic protocols. Metal duct repairs in Kendall generally range from $380-$750 depending on the extent of damage and whether sections need full replacement.
Duct Insulation
When insulation gets wet or mold-contaminated, it stops working and becomes a health concern. In Kendall’s persistent humidity, we’ve stripped out saturated fiberglass insulation from attic runs and replaced it with closed-cell foam or fresh fiberglass wrapped in vapor barrier. Proper insulation prevents condensation on cold duct surfaces, which is the root cause of most mold problems we see. Duct insulation work in Kendall typically runs $420-$890 for partial replacement, or $1,200-$2,400 for full system re-insulation.
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 Kendall
We stock parts and specify equipment from the brands that serious HVAC contractors trust: Rotobrush for duct agitation and cleaning, Nikro for HEPA containment and vacuum systems, and Abatement Technologies for air scrubbing and negative-pressure equipment. For controls and filtration upgrades during sealing work, we also work with Honeywell and Aprilaire products. We keep common flex duct sizes, mastic compounds, and connection hardware on our trucks so most Kendall jobs don’t wait for parts. If your system uses a specific brand component, we’ll match it or explain why an alternative makes sense. No guesswork, no surprises.
Common Duct Repair & Sealing Problems We See in Kendall Homes
- Collapsed flex-duct inner liners. In Kendall’s western 33156 corridor, the decades-old original fiberglass flex ductwork is so deteriorated from humidity cycling that inner liners collapse or separate from boot connections without affecting airflow temperature - meaning homeowners only discover the failure during a mold complaint or energy audit, not from comfort loss. The A/C blows cold, but it’s blowing through a fraction of the designed pathway.
- Separated boot and plenum connections. Flex duct connections at boots and plenums separate due to age and adhesive failure, creating massive air leaks and infiltration of humid crawlspace or attic air. In Kendall, that infiltrating air carries elevated mold-spore loads from the Everglades buffer zone, directly contaminating your supply air.
- Undetected leaks in multi-zone estate homes. Multi-zone estate homes in Pinecrest have complex duct layouts that were never inspected; leaks in buried or attic runs go undetected for years, wasting energy and drawing in mold spores. We’ve found 30% airflow loss in systems where the homeowner only noticed “the bedroom never cools right.”
- Condensation-saturated insulation. Central A/C units running 11+ months annually create near-constant condensation cycles inside ducts and drain pans. When insulation gets wet, it compresses, loses R-value, and becomes a mold substrate. In Kendall’s inland tropical-monsoon position, this happens faster than in coastal neighborhoods where breezes provide some dilution.
Pricing for Duct Repair & Sealing in Kendall, FL
We don’t do bait coupons or price changes at the door. Here’s what duct repair and sealing actually costs in the Kendall market:
| Service | Typical Range in Kendall |
|---|---|
| Duct sealing (mastic, joints, plenums) | $280 - $520 |
| Flex duct repair / partial replacement | $340 - $680 |
| Metal duct repair / section replacement | $380 - $750 |
| Duct insulation replacement (partial) | $420 - $890 |
| Full system re-insulation | $1,200 - $2,400 |
| Mastic sealant application (standalone) | $120 - $240 |
What moves the number: linear footage of ductwork, attic accessibility, whether we need to remove contaminated insulation, and whether the system requires multiple return trips for drying before sealing. We inspect with a camera first, show you the footage, and give you a written price before work begins. Estimates are free. We also honor our standing offers: $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount.
We Also Serve Cities Near Kendall
Our service area extends to Pinecrest, Glenvar Heights, South Miami, and Cutler. If you’re in one of these communities and your home shares the same vintage housing stock and humidity challenges, we apply the same inspection protocols and pricing transparency. Call (844) 685-6342 and we’ll confirm coverage.
Serving Kendall, FL - Our Local Coverage Area
We’re based in the Kendall 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 Kendall
You probably won’t know until you look. The defining failure mode in Kendall’s 33156 corridor is collapsed or separated flex-duct liners that don’t affect supply air temperature - the A/C still blows cold, but airflow volume drops and mold colonizes the stagnant sections. The only reliable detection is a camera inspection of the duct interior. We offer free estimates that include this visual check; call (844) 685-6342 to schedule.
Yes. Kendall’s inland position adjacent to Everglades wetlands elevates ambient biological particulate counts beyond what coastal Miami-Dade neighborhoods experience. Unsealed ducts actively draw this humid, spore-laden air into your system, accelerating mold growth inside the ductwork and air handler. Sealing is preventive maintenance with a measurable health benefit in this specific microclimate. We can assess your leakage rate during a free estimate - call (844) 685-6342.
We can, and we regularly do. Pinecrest estate homes often have complex multi-zone layouts with flex branch runs that have sagged, torn, or separated at boots after decades without inspection. We replace damaged sections with properly supported, insulated flex or transition to metal where appropriate, then seal all connections with mastic. Most of these repairs complete in a single visit. Call (844) 685-6342 for an exact quote - estimates are free.
Because condensation forms on cold duct surfaces when warm, humid attic air contacts them, and Kendall’s relative humidity stays above 70% most of the year. Once insulation gets wet, it loses its thermal barrier function and becomes a mold reservoir. The smell is microbial volatile organic compounds - actual mold metabolism. We remove contaminated insulation, repair any duct leaks causing the condensation, and reinstall with proper vapor barrier. Call (844) 685-6342 for a camera inspection and written estimate.
We specify Honeywell and Aprilaire for filtration and air-quality upgrades that often accompany sealing work - whole-home media filters, UV germicidal systems, and fresh-air ventilation controls. For the sealing itself, we use professional-grade mastic compounds and tapes, plus Abatement Technologies containment equipment when mold is present. We’ll recommend the right combination based on what your camera inspection reveals. Call (844) 685-6342 to discuss your system.
Ready to find out what’s actually happening inside your ducts? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate in Kendall. We’ll show you the camera footage, name an honest price before we start, and back every repair with our 90-Day Done Right Promise - in writing, no paperwork, no arguing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Kendall since 1984.