Duct Sealing in Jacksonville - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Jacksonville

Duct sealing in Jacksonville typically runs $400 – $900 for a whole-home system, with most jobs completed in a single scheduled visit. If your upstairs rooms stay stuffy while your downstairs over-cools, or your energy bill climbs every summer without explanation, leaking ductwork is the likely cause. Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate with a written price before any work starts.

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We’ve worked in Jacksonville homes since 2004, from the historic bungalows of Riverside and Avondale to the mid-century ranches in Arlington and newer builds on the Southside. Our crews dispatch from the Jacksonville office, so we know the local housing stock and what fails in it. That matters because duct sealing in a 1920s bungalow with original galvanized metal trunks is a different job entirely from sealing flex duct in a 2015 subdivision. We carry the right materials for both.

Our Duct Sealing team uses professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and every technician is background-checked, uniformed, and held to The Garrison Code: arrive inside the window, price in writing, complete the job by the book, leave the site clean. No exceptions.

Why Hollis Air Duct Cleaning Is Jacksonville’s Preferred Duct Sealing Company

Hollis is part of the Garrison Partners family, and we’ve built our name in Jacksonville on one thing that competitors rarely put in writing: the 365-Day Done Right Promise. If our duct sealing 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 Jacksonville customers mention the same points in reviews: the technician showed up in the quoted window, explained what they found with a camera, wrote the price down before touching anything, and the final invoice matched the written estimate exactly. No one likes surprises when a stranger is already inside their home.

Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule. Dispatch and scheduling are coordinated from our Jacksonville office, and crews serve the metro locally, including same-week appointments for most duct sealing jobs.

We know Jacksonville’s specific problems: the oak pollen that blankets the city every March and April, the humidity that keeps AC running six months straight, the post-Irma water intrusion still hiding in walls. That local knowledge changes what we look for and how we fix it.

Duct Repair in Jacksonville

Duct Repair in Jacksonville often starts with a homeowner complaint that sounds like an equipment problem: uneven temperatures, rooms that never cool, a blower motor that runs constantly. In our experience, the real cause is usually damaged ductwork, not the HVAC unit itself. We find crushed branch runs behind walls from old renovations, disconnected flex duct that has pulled free at the collar, and original metal trunks in Arlington ranches that have separated at every joint after sixty-plus years of thermal cycling. A typical duct repair in Jacksonville runs $250 – $600 depending on accessibility and the extent of mechanical damage.

Mechanical Repair Before Sealing

Tape or aerosol sealant cannot fix a duct that is physically crushed, disconnected, or rusted through at the seam. We repair the structural problem first, then seal. In a 1950s Arlington ranch we visited last spring, the original metal ductwork had failed at every joint; sealant alone would have peeled off within a season. We reassembled the trunk with proper supports, applied mesh and mastic, and the system finally held pressure.

Post-Flood Damage Assessment

After Hurricane Irma and the routine summer thunderstorms that drop fifty-plus inches of rain annually, many Jacksonville homes have hidden water damage in duct runs. We inspect for rust, separated insulation, and mold growth before any sealing work. Sealing over damaged duct material traps moisture and makes the problem worse. We remove and replace compromised sections, then seal the intact runs.

Air Duct Sealing in Jacksonville

Air Duct Sealing in Jacksonville is most often needed in homes with forced-air systems that have never had the ductwork properly sealed since installation. The Department of Energy estimates the average home loses 20 – 30% of conditioned air through leaks; in Jacksonville’s older homes with original metal or early flex duct, we’ve measured losses above 40%. That means you’re paying to cool your attic, crawl space, or wall cavities. A typical whole-home air duct sealing in Jacksonville runs $400 – $900, with larger historic homes or complex systems at the higher end.

Mastic and Mesh Application

We seal accessible joints and seams with duct mastic reinforced with fiberglass mesh, not foil tape. Mastic remains flexible, handles the thermal expansion of Jacksonville’s metal ductwork, and lasts decades. Tape dries out and peels, especially in attics that reach 140 degrees in July and August. We apply mastic by hand to ensure complete coverage at every joint, collar, and penetration.

Pressure Testing After Sealing

After sealing, we run a static pressure test to verify the system holds. If the pressure doesn’t improve, we keep looking until we find the leak. In a San Marco home last year, the initial test showed we were still losing air; camera inspection revealed a disconnected return branch behind a knee wall from a 1980s renovation. We reconnected it, sealed the joint, and the pressure finally held. The homeowner’s upstairs bedroom cooled properly for the first time in three summers.

Trusted Brands We Service in Jacksonville

Hollis stocks parts and sealing materials from Abatement Technologies, Guardsman, Rotobrush, and Nikro, the same brands commercial crews use in hospitals and schools. For Jacksonville homeowners, that means no waiting on special orders for standard fittings, collars, or mastic compounds. We carry HEPA filtration products from Honeywell and Aprilaire for jobs that require source removal before sealing. If your system needs a specific component, we can usually source it within 24 hours through our Jacksonville supply relationships. Fast turnaround matters in July when your AC is running fourteen hours a day and every day of delay shows up on your FPL bill.

Common Duct Sealing Problems We See in Jacksonville Homes

• Sealing over active mold in historic homes. In Riverside and Avondale bungalows, we regularly find microbial growth inside original uninsulated metal trunks caused by year-round condensation. Sealing without first removing the growth traps moisture against the seams and feeds the problem. We complete source removal with negative-air machines and HEPA filtration before any mastic goes on.
• Tape failure on 1950s-60s Arlington ranch ductwork. Original metal ductwork in these homes has expanded and contracted through sixty years of Florida summers. Foil tape dries, cracks, and peels at every joint. We remove the old tape, clean the surface, and apply mesh-reinforced mastic that flexes with the metal.
• Disconnected or crushed runs discovered during cleaning. Homeowners call for a duct cleaning and we find a branch run blowing conditioned air into a wall cavity or a crushed flex duct behind a finished basement ceiling. Ignoring these leaves supply and return ducts unbalanced, so oak pollen and humidity keep loading the system even after the accessible seams are sealed.
• Post-Irma water intrusion in flood-prone neighborhoods. In San Marco and Riverside, we still find ductwork with rust, separated insulation, or mold from flooding that homeowners thought had dried out. The humid subtropical air prevents complete drying in enclosed spaces. We replace compromised sections and seal only after the system is clean and dry.

Pricing for Duct Sealing in Jacksonville, FL

We Also Serve Cities Near Jacksonville

Our Jacksonville crews also handle duct sealing in Orange Park, Fleming Island, Middleburg, and Atlantic Beach. The same written pricing, same 365-Day Done Right Promise, same background-checked technicians apply in every community we serve.

FAQs About Duct Sealing in Jacksonville