Fast, Reliable Duct Repair & Sealing Across Longboat Key
Duct repair and sealing in Longboat Key typically costs $280-$650 for most condo unit repairs, with full flex duct replacement in older towers running $850-$1,400. Bellows Air Duct & Vent Co. has served barrier island properties since 1984, and our crews make the run from the mainland to Longboat Key with same-day or next-morning scheduling. Call (844) 685-6342 for a free estimate before we roll a single truck.
We know the island’s buildings. The mid-rise condominiums along Gulf of Mexico Drive, the low-rise complexes tucked behind the tennis courts near Bay Isles Road, the original 1970s towers south of Longboat Club Road - our technicians have pulled failed duct board from closets in all of them. Salt air and 70% baseline humidity don’t negotiate, and neither do we when a job needs doing right.
Why Bellows Air Duct & Vent Co. Is Longboat Key’s Preferred Duct Repair & Sealing Company
Forty-two years in this trade means we’ve watched Longboat Key’s housing stock age in real time. The same fiberglass duct board we sealed in 1987 is now failing in the same buildings, and we know what replaces it for the long haul.
Our reputation here is built on showing up when we say we will. Calls to our office are answered by a live person, 24 hours a day - not a voicemail tree, not an app. Longboat Key customers don’t want to punch buttons; they want to talk to someone who knows the difference between a Bay Isles condo and a Silver Sands unit.
Every job starts with a camera inspection of your ductwork, and every job ends with another. You see what we see: the delaminated duct board, the salt-corroded collar, the flex duct cracked behind the wall. Then we hand you the invoice that matches the quote we gave on the phone. No bait coupons. No price change at the door. Our Duct Repair & Sealing team carries the 90-Day Done Right Promise on every repair - if it’s not right, we return at no charge, no paperwork, no arguing.
Background-checked, uniformed technicians. Upfront pricing disclosed before a tool is lifted. That’s the square deal we’ve offered since 1984.
Our Duct Repair & Sealing Services in Longboat Key
Duct Sealing
Air leaks in Longboat Key ductwork don’t announce themselves. They hiss behind condo walls, bleed conditioned air into hot elevator lobbies, and drive up electric bills while the unit never quite cools. We seal with mastic sealant and metal-backed tape rated for coastal humidity, not the cheap foil tape that peels off in six months of salt air. In a typical Longboat Key condo, we’ll find 15-30% air loss through seams and connections before we start. Afterward, we verify with a pressure test. The 90-Day Done Right Promise covers our sealing work - if you feel a draft from a sealed joint, we return.
Flex Duct Repair
Flex duct in Longboat Key’s older condos is often original to the 1980s or 1990s install, and three decades of heat, humidity, and salt particulates leave it brittle. We regularly find flex duct cracked at the collar connection, sagging between supports, or collapsed where a tenant stored luggage against it. Our crew can replace a single damaged run without tearing open walls - we fish new insulated aluminum flex through the existing chase, secure it with proper supports, and seal it to the plenum with mastic. A single flex duct replacement in a Longboat Key condo typically runs $340-$580; multiple runs or longer chases push toward the $850-$1,400 range.
Metal Duct Repair
Sheet metal ductwork in Longboat Key’s common areas - elevator lobbies, storage rooms, parking garage transitions - corrodes from the inside out where salt-laden air infiltrates unconditioned spaces. We’ve cut open metal ducts in tower basements where the bottom had rusted through completely, dumping conditioned air into a concrete vault. We patch with galvanized steel, seal with mastic, and wrap with insulation rated for exterior use. When corrosion is too extensive, we section in new metal rather than patch a lost cause. The decision point is straightforward: if we can show you clean metal within 6 inches of the damage, we repair. If the rust runs the length of the chase, we quote replacement.
Duct Insulation & Mastic Sealant
Condensation on ductwork is a constant threat in Longboat Key, where 75°F dew points are common from May through October. Uninsulated or poorly insulated ducts sweat, drip onto ceiling tiles, and breed mold. We wrap repaired ducts with closed-cell insulation and seal every seam with mastic - a thick, brush-applied sealant that remains flexible and adheres to metal, fiberglass, and flex duct even in salt air. Unlike tape, mastic doesn’t dry out or delaminate. We specify it for every Longboat Key job because we’ve seen what happens when we don’t.
What happens when you call
- 1
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 Longboat Key
Our trucks carry Rotobrush duct cleaning systems and Nikro HEPA vacuums for the full service cycle, and we stock Abatement Technologies filtration and containment products for jobs where disturbed fiberglass or mold requires controlled handling. For Longboat Key’s coastal environment, we source insulated aluminum flex duct and mastic compounds rated for high-humidity exposure - not the standard-grade materials that fail in eighteen months on this island. Parts availability matters when you’re scheduling around a snowbird’s November return, and we don’t wait on mainland suppliers for what we should already have.
Common Duct Repair & Sealing Problems We See in Longboat Key Homes
- Fiberglass duct board delamination. The original 1970s-80s duct board in Longboat Key condo closets loses its interior facing after decades of salt-humidity cycling, releasing fiberglass particles directly into the supply air. Homeowners notice a persistent dust or itching sensation. This failure mode is essentially unknown in newer mainland construction but common up and down this island.
- Brittle flex duct at connections. Thirty- to fifty-year-old flex duct cracks where it meets the metal collar, creating hidden leaks behind drywall. The unit runs longer, costs more to operate, and never achieves set temperature. We find this in nearly every pre-1995 Longboat Key condo we inspect.
- Salt corrosion in common-area metal duct. Elevator lobbies, storage rooms, and garage transitions draw unconditioned salt air through gaps and seams. Sheet metal rusts from the interior surface outward, often discovered only when water stains appear on ceiling tiles below.
- Mold colonization in vacant units. Snowbird owners leave Longboat Key condos idle from May through October, running minimal AC while warm, moist Gulf air infiltrates through leaky ductwork. By November, mold has established in the duct liner. The first heating cycle in fall distributes spores throughout the unit.
Pricing for Duct Repair & Sealing in Longboat Key, FL
We don’t quote blind, and we don’t bait-switch. Here’s what duct repair and sealing costs in Longboat Key’s market:
| Service | Typical Range |
|---|---|
| Mastic sealing of accessible duct seams (per unit) | $280-$420 |
| Single flex duct repair or replacement | $340-$580 |
| Multiple flex duct runs (2-3) | $650-$980 |
| Full flex duct replacement, condo unit | $850-$1,400 |
| Fiberglass duct board replacement with metal transition | $720-$1,100 |
| Metal duct patch/repair, common area | $450-$780 |
| Duct insulation wrap (per linear foot) | $12-$18 |
What moves the number: access difficulty in cramped Longboat Key closets, extent of salt corrosion, whether asbestos wrap is present on older metal (requires abatement protocol), and whether the job requires containment for disturbed mold or fiberglass. We disclose the full price before we lift a tool. No surprises on the bill.
Standing offers: $50 off any repair over $250. Free second opinion on any written estimate. Permanent 5% senior and veteran discount. Call (844) 685-6342 for your exact quote - estimates are free.
We Also Serve Cities Near Longboat Key
Our service area extends across Sarasota and Manatee counties. We regularly run to Longboat Key from our mainland route, and we also handle duct repair and sealing in Bayshore Gardens, South Bradenton, West Samoset, and Palmetto. Same crew, same equipment, same upfront pricing.
Serving Longboat Key, FL - Our Local Coverage Area
We’re based in the Longboat Key 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 Longboat Key
Salt-laden air from the Gulf and Sarasota Bay attacks the interior facing of fiberglass duct board, accelerating delamination by roughly half the lifespan you’d see in inland Sarasota or Bradenton. The island’s 70%+ year-round humidity keeps the fiberglass moist, weakening the adhesive bond that holds the interior liner. We replaced duct board in a mainland Bradenton condo last month that was the same age as a Longboat Key unit we did the week before - the mainland board was intact, the Longboat Key board was shedding particles. Call (844) 685-6342 and we’ll camera-inspect yours.
We can repair a single damaged section if the remaining flex is sound and accessible. We cut out the failed portion, install a new insulated aluminum flex section with proper supports, and seal with mastic. If the flex is brittle throughout the chase or sagging between supports, we quote full replacement - patching brittle duct is a callback waiting to happen, and we don’t do callbacks. The camera inspection tells us which path to take. Call for a free look.
Yes. Have us inspect in September or early October, before you return. We find mold colonization in roughly one-third of vacant Longboat Key condos we inspect after summer idle - warm, moist Gulf air infiltrates through leaks, and the minimal AC run during vacancy isn’t enough to dehumidify the duct liner. We can clean, seal, and sanitize before you arrive, so your first heating cycle doesn’t distribute musty air through the unit you’ve been waiting all year to enjoy. Schedule the inspection at (844) 685-6342.
Yes. We use water-based mastic compounds rated for exterior HVAC application and high-humidity environments, not the hardware-store grade that dries and cracks. Mastic remains flexible, fills irregular gaps better than tape, and doesn’t rely on adhesive that salt air degrades. We’ve returned to Longboat Key jobs five years after sealing and found mastic joints still intact where tape had failed on adjacent connections. It’s the only sealant we specify for this island.
The smell is likely coming from mold in the duct liner or from delaminated fiberglass duct board trapping moisture behind the facing. Cleaning the interior surface doesn’t reach mold rooted in porous duct board or in the insulation wrap around metal ducts. We camera-inspect to locate the source - if it’s duct board, replacement is the permanent fix. If it’s insulation wrap, we remove and replace with closed-cell material. Masking the odor doesn’t solve it; we find the source and eliminate it. Call (844) 685-6342 for a diagnosis.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Longboat Key since 1984.