Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Fleming Island
We dispatch crews to Fleming Island from our Miami coordination office, and we’ve worked enough homes in Eagle Harbor, Fleming Island Plantation, and Pace Island to know what we’re walking into. Nearly every house here was built after 1990 with original builder-grade flex duct in the attic, so the sealing problems we find aren’t the same as older Jacksonville neighborhoods with sheet metal. If your registers smell musty, your AC runs nonstop July through September, or your upstairs never cools evenly, the culprit is usually failed mastic or crushed flex runs in that 130°F attic space, not ordinary dust. Call (361) 326-5060 and we’ll give you a written price before any work starts.
Why Hollis Air Duct Cleaning Is Fleming Island’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Duct Sealing in Fleming Island work follows The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, leave the site clean. Our technicians are background-checked and uniformed, and our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues.
Every repair we perform in Fleming Island carries our 365-Day Done Right Promise in writing. If the work fails within a year, we return and make it right at no charge, including a free second visit. That’s not a slogan; it’s printed on every job sheet.
Our crews know the local HOA rules that govern contractor signage and exterior venting modifications in master-planned communities here. We pull the proper permissions so you don’t get a compliance letter two weeks later.
Air Duct Sealing in Fleming Island
Air Duct Sealing in Fleming Island means re-mastic-ing the collar and trunk joints on original builder-grade flex systems and re-suspending sagging runs that have collapsed between trusses. This isn’t legacy sheet metal work. Homes in Eagle Harbor and Fleming Island Plantation were built with R-6 or R-8 flex duct hung in unconditioned attics, and after 20-30 years of 130-150°F summer heat cycles, the mastic cracks and the straps fail. A typical sealing job in Fleming Island runs $450 – $850 for a single system, depending on how many joints need attention and whether we need to re-suspend crushed runs.
What We Actually Seal
We apply fresh mastic at the air handler plenum, trunk connections, and register boots. Where flex has pulled away from collars, we reattach and seal with proper mechanical fasteners and mastic, not tape that’ll cook off in the attic. Every joint gets a visual and pressure verification before we close up.
When Sealing Isn’t Enough
Sometimes the flex itself is the problem. Runs pinched between trusses or sagging so they hold water from condensate need to be re-suspended with proper strapping before sealing does any good. We’ll show you camera footage and give you a written price for the full repair, not a band-aid.
Duct Sealing Services in Fleming Island
Duct Sealing Services in Fleming Island address the specific failure modes of post-1990 master-planned construction. The slab-on-grade stucco homes here have long duct runs through hot attics, and the original mastic was never designed for three decades of thermal cycling. When we seal your ducts, we’re stopping the infiltration of 150°F attic air that drives your AC runtime through the roof and creates the condensate that leads to musty odors. A full-system sealing with re-suspension of crushed runs typically falls between $650 – $1,200 for larger homes or dual-zone systems.
Construction Debris Removal
Newer Fleming Island homes often have drywall dust and framing debris left in the ducts at builder handover. We pull that material with negative-air HEPA filtration before we seal, because sealing over debris just traps it. Our Duct Sealing team uses Rotobrush rotary agitation and Nikro negative-air machines to remove source contamination first.
Post-Storm Inspection
Hurricane-season power outages and attic moisture intrusion can shift ductwork and crack seals. We inspect for storm-related displacement and include that assessment in every sealing quote for Fleming Island homes.
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 Fleming Island
We stock filtration and sealing products from Aprilaire, Abatement Technologies, and Guardsman for Fleming Island jobs, so we’re not waiting on Miami warehouse shipments to finish your repair. Our equipment roster includes Rotobrush rotary brush systems and Nikro negative-air machines, the same tools commercial crews use. For homeowners in Eagle Harbor and Pace Island who need compatible filtration upgrades after sealing, we carry Honeywell and Aprilaire media filters that fit the return plenums we commonly see in local homes. Parts on the van mean we finish the job in one visit, not two.
Common Duct Sealing Problems We See in Fleming Island Homes
- Builder handover dust cooked into the system. Drywall and framing debris left in supply and return ducts at closing gets heated by 130-150°F attic air and pushed through every register. That’s why your year-old Fleming Island home smells musty, not because of ordinary household dust.
- Cracked mastic at collars and plenums. The original builder-grade mastic on flex systems hardens and splits after repeated thermal cycling. Sealed-looking joints leak hot attic air, driving up humidity inside the duct and promoting microbial growth you smell before you see.
- Crushed, sagging flex between trusses. Runs hung with minimal support in the attic chase kink and collapse under their own weight over time. Low airflow and hot attic infiltration, not dirt, are the real problem, and sealing alone won’t fix a pinched run without re-suspending it properly.
- Condensate from attic air infiltration. When leaks pull humid outside air into cool ducts, water forms on the flex interior. In Fleming Island’s year-round high humidity, that moisture feeds odor-causing growth that standard cleaning won’t permanently solve without sealing the source.
Pricing for Duct Sealing in Fleming Island, FL
A typical partial sealing of failing joints on a single system in Fleming Island runs $450 – $650. Full-system sealing with re-suspension of multiple crushed runs and complete mastic replacement on a larger home or dual-zone system runs $850 – $1,400. What moves the price: how many linear feet of flex need re-support, whether the air handler plenum requires re-fabrication, and if we find construction debris that needs source removal before sealing.
We give you one flat price per system, agreed in writing before any work starts. No per-vent pricing, no add-ons at the door. You’ll see before-and-after photos of your own ducts, and we’ll explain what we found in plain terms. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Fleming Island
Our crews regularly work in Orange Park, Green Cove Springs, Middleburg, and Jacksonville. Each of these markets has different housing stock and different duct problems, but The Garrison Standard stays the same: written price, written guarantee, background-checked uniformed technicians, and the 365-Day Done Right Promise on every job.
Serving Fleming Island, FL - Our Local Coverage Area
We’re based in the Fleming Island 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 About Duct Sealing in Fleming Island
Builder handover debris is the reason. Drywall dust, framing particles, and insulation scraps get left in the supply and return ducts during construction, then get cooked by 130-150°F attic heat and pushed through your registers. A homeowner in Eagle Harbor called us because every register smelled musty within a month of moving into a home built the previous year. Camera inspection showed drywall dust and construction debris caked along the supply and return ducts, and the flex runs had sagged until they were pinched between trusses, choking airflow in the summer heat. We pulled the system under negative pressure with HEPA filtration, agitation tools and source removal, then sealed the failing joints at the air handler and trunk – the smell cleared and the blower motor stopped short-cycling. Call (361) 326-5060 for a free inspection.
Yes, substantially different. These homes use long runs of flexible duct in unconditioned attics, not the shorter sheet metal runs common in older pier-and-beam construction. The sealing challenge is re-mastic-ing flex-to-collar joints and re-suspending crushed runs, not resealing rigid metal seams. Call (361) 326-5060 and we’ll show you exactly what your system needs.
Northeast Florida’s humidity and 130-150°F attic temperatures create condensate inside leaking ducts, which feeds microbial growth you smell long before you’d notice dust. The odor is usually the first sign of failed mastic or crushed flex pulling hot, humid attic air into the system. Call (361) 326-5060 for a camera inspection that’ll show you the source.
Yes, if your problem is duct leakage. When 150°F attic air infiltrates through cracked mastic or disconnected collars, your AC runs longer to hit the thermostat setpoint. Sealing those leaks can reduce runtime 15-30% in typical Fleming Island homes we’ve worked. It won’t fix an undersized unit, but it removes the load that leaky ducts add. Call (361) 326-5060 for a pressure test that’ll quantify your leakage.
Most master-planned communities here, including Eagle Harbor and Fleming Island Plantation, require HOA notification for any contractor work that involves exterior access or visible modifications. We handle that paperwork as part of our standard process, and our crews arrive in marked vehicles with proper signage that complies with community rules. Call (361) 326-5060 and we’ll confirm your specific HOA requirements when we schedule.
Ready to stop the musty smells and get your AC running the way it should? Call (361) 326-5060 for a free estimate. We’ll give you a written price before any work starts, and every job is backed by our 365-Day Done Right Promise in writing.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Fleming Island since 2004.