Fast, Reliable Duct Repair & Sealing Across Sanibel
Duct repair and sealing in Sanibel typically costs $280-$650 for most residential jobs, with flex duct replacement running higher when flood damage is involved. Our crew crosses the Causeway from the mainland with stocked vans, and most Sanibel calls are answered within the hour by a live person at our office. We’ve been working on island homes since long before Hurricane Ian, and we understand the difference between mainland ductwork and what Sanibel’s salt air, attic heat, and storm history do to your system.
Call (844) 685-6342 for a free estimate. We’ll show you exactly what your ducts look like inside before we quote a dollar.
Why Bellows Air Duct & Vent Co. Is Sanibel’s Preferred Duct Repair & Sealing Company
We’ve served Lee County homeowners for over 42 years, and Sanibel has always been part of our route. Ray Castillo built this company on the idea that a square deal means showing the price before the work starts, and that hasn’t changed since 1984. Our Duct Repair & Sealing team knows the island’s homes - the 1970s ranch-style places on Tarpon Bay Road, the elevated stilt houses near Lighthouse Beach, the rebuilt condos along Periwinkle Way.
Our technicians are background-checked and uniformed, and they carry camera inspection equipment on every van. You see what we see: corroded joints, failed mastic, flex duct that’s turned to sponge from humidity. No claims without proof.
Calls are answered by a live person, 24 hours a day. Not a voicemail tree. Not an app. A real person who can dispatch a crew.
Our 90-Day Done Right Promise applies to every Sanibel job. If it’s not right, we make it right. No paperwork, no arguing. That’s been our way for four decades.
Our Duct Repair & Sealing Services in Sanibel
Mastic Sealant Application
Mastic sealant is the standard for sealing metal duct joints, but on Sanibel it fails within months if the surface isn’t ground clean first. Salt corrosion from Gulf air leaves a crystalline residue that prevents adhesion. Our crew grinds every joint to bare metal, applies Abatement Technologies-compatible mastic in two coats, and verifies with a pressure test before we leave. In elevated homes from Middle Gulf Drive to the east end, we’ve learned that skipping the prep work means a callback we don’t want to make.
Flex Duct Repair and Replacement
Because Hurricane Ian’s storm surge in 2022 submerged Sanibel’s ductwork in saltwater and mud, many duct repairs now require replacing flood-damaged flex ducts and registers that ordinary mainland sealing jobs would simply patch. The fiberglass insulation inside flex duct acts like a wick - once it’s absorbed contaminated water, no cleaning fully restores it. We cut out damaged sections, splice in new flex with mechanical connectors (not just tape), and seal every joint with mastic. For homes near the Sanibel River or along Gulfside, we see this more than anywhere else in Lee County.
Metal Duct Repair
Galvanized metal ducts corrode faster on Sanibel than on the mainland. The combination of salt air and attic temperatures exceeding 140°F in July and August eats through seams and joints. We repair separated seams with drive cleats and sealant, replace rusted sections with 26-gauge galvanized stock, and reinforce areas where vibration has caused fatigue. Older homes in the 33957 ZIP code often have original metal trunk lines from the 1980s that are approaching end of life - we tell you when repair is throwing good money after bad.
Duct Insulation Replacement
Unconditioned attic spaces in Sanibel’s elevated homes turn duct insulation into a mold incubator. When AC cycles off, warm humid air condenses against cool duct surfaces. We replace waterlogged or delaminated insulation with closed-cell products rated for high-humidity environments, and we pay special attention to the duct wrap at attic penetrations where air leaks compound the problem. Proper insulation after repair means your system doesn’t work twice as hard to push cool air through a hot attic.
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 Sanibel
We stock parts and materials from Rotobrush, Nikro, and Abatement Technologies - the same brands serious HVAC contractors specify for coastal environments. For Sanibel’s salt-air conditions, we source mastic sealants and closed-cell insulation wraps that carry specific humidity and corrosion ratings, not generic hardware-store stock. Most repairs are completed in a single visit because our vans carry the inventory. You don’t wait for a parts run to Fort Myers while your attic sits open.
Common Duct Repair & Sealing Problems We See in Sanibel Homes
- Mastic sealant fails within months on salt-corroded metal ducts if the surface isn’t ground clean first - common in post-Ian raised homes throughout the 33957 ZIP code. We see this on stilt houses where Gulf breeze carries salt directly into soffit vents and attic intakes.
- Flex duct repairs re-contaminate quickly if air handlers cycle humid attic air through uninsulated sections. Sanibel’s year-round AC demand means systems never get a drying period. A partial repair without proper insulation traps moisture in the new material.
- Sealing leaks in elevated crawlspace ducts misses hidden mold colonies in flood-sediment layers that require full replacement. Ian deposited fine silt inside duct cavities that ordinary sealing doesn’t address. We camera-inspect before we commit to any seal-only approach.
- October-November arrival season brings emergency calls from seasonal owners discovering six months of mold growth in ducts left dormant through summer. The island’s snowbird pattern means homes sit sealed and humid from May through October, exactly when microbial activity peaks.
Pricing for Duct Repair & Sealing in Sanibel, FL
Most duct sealing jobs in Sanibel run $280-$450 for a standard residential system with accessible attic work. Flex duct replacement where Ian damage is present typically ranges $380-$650 depending on linear feet and contamination level. Metal duct repair with seam rebuilding and corrosion treatment falls between $320-$520. Duct insulation replacement adds $180-$340 when done in conjunction with repair work.
What moves the number: attic accessibility in elevated homes, extent of salt corrosion, whether flood sediment requires full flex replacement versus spot repair, and how many registers need resealing. We disclose the full price before we start. The number on the phone is the number on the invoice.
Current 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 Sanibel
Our crews cross the Sanibel Causeway daily from the mainland, and we regularly handle Duct Repair & Sealing in Sanibel as well as neighboring Fort Myers Beach, Iona, Cypress Lake, and McGregor. Same live-answer phone line, same camera inspection, same 90-Day Done Right Promise for every community we serve.
Serving Sanibel, FL - Our Local Coverage Area
We’re based in the Sanibel 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 Sanibel
Many Sanibel ducts need full replacement rather than simple repair because floodwater contamination penetrates flex duct insulation and metal duct seams in ways that sealing cannot reverse. If your home took surge water above floor level, we camera-inspect first - but we’ve found that mastic sealing over Ian-damaged ducts simply traps mold and sediment. Call (844) 685-6342 and we’ll show you what you’re dealing with before you decide.
The October-November arrival window is when seasonal owners discover flex duct seals that have degraded through six months of peak humidity cycling with minimal AC use. Tape adhesives fail, mastic cracks, and duct liners separate - then the first full cooling cycle blows loose particles into the living space. We book heavily during this period; call ahead to reserve an appointment.
Lee County enforces Florida Building Code wind and flood requirements that affect duct routing and materials in Sanibel’s flood zones, particularly for post-Ian rebuilds and elevations. Ductwork in new or raised construction must meet specific corrosion-resistance standards for coastal environments. We coordinate with local inspectors when permits are required and specify materials that pass muster the first time.
Proper duct sealing reduces the cooling load your system fights in Sanibel’s 140°F attics by preventing conditioned air from leaking before it reaches your rooms. Sealing alone doesn’t lower attic temperature, but it stops your AC from working overtime to replace lost cool air. We pair sealing with insulation assessment to address both the leak and the thermal gain.
We specify mastic sealants rated for high-salinity, high-humidity environments - products from Abatement Technologies and compatible professional-grade lines that carry specific coastal corrosion resistance, not generic all-purpose compounds. The right product applied to properly prepared metal lasts years longer here. We’ll show you the spec sheet if you ask.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Sanibel and Southwest Florida since 1984.