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.
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After
Before
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Before
AfterFast, Reliable Duct Sealing Across St. Augustine South
If you’re living in St. Augustine South and your AC runs constantly but certain rooms stay stuffy, you probably don’t need a new unit. You need your ducts sealed. In this neighborhood’s 1970s and 1980s ranch homes, flex duct in hot attics loosens at the seams and leaks conditioned air into spaces no one occupies. We see it every week on calls along State Road 207 and in the tree-canopied streets near the Intracoastal. Hollis Air Duct Cleaning dispatches crews from our Miami office, and we schedule St. Augustine South homeowners with arrival windows we actually honor. Call (361) 326-5060 for a free estimate with a written price before any work starts.
Why Hollis Air Duct Cleaning Is St. Augustine South’s Preferred Duct Sealing Company
We’ve been sealing ducts in St. Augustine South long enough to know which streets still have the original 1970s flex runs and which subdivisions got updated in the 2000s but missed the connections. That matters because a crew that treats every home the same will miss the gaps.
Our technicians are background-checked, uniformed, and held to The Garrison Code: arrive inside the window, price in writing, finish by the book, leave the site clean. No exceptions. Our Duct Sealing in St. Augustine South customers get the same standard.
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 book.
Every repair carries our 365-Day Done Right Promise. If the seal fails within a year, we return and make it right at no charge, including a free second visit. That’s written on every job, not implied.
Air Duct Sealing in St. Augustine South
Air Duct Sealing in St. Augustine South means closing the gaps, disconnected joints, and deteriorated mastic in your home’s duct network so the air you paid to cool actually reaches your living spaces. Most homes here lose 20 to 30 percent of conditioned air through leaks in attics and crawlspaces, which in our subtropical humidity also pulls in moisture, pollen, and attic dust. You need it when rooms won’t balance, your energy bill climbs without explanation, or you smell mustiness from the vents after a storm.
Typical duct sealing in St. Augustine South runs $450 to $1,200 for a whole-home system, depending on accessibility and how much of the original ductwork needs attention. We use mastic sealant and metal-backed tape, not duct tape, because the heat in your attic will bake off anything less.
Attic Flex Duct Repair
Most St. Augustine South homes have flex duct running through unconditioned attics. The insulation sleeve separates from the inner liner, collars slip off plenums, and sagging runs create low spots where condensation pools. We cut out damaged sections, install new flex with proper supports, and seal every joint with mastic rated for Florida attic temperatures.
Crawlspace and Raised-Foundation Work
Homes near the wetlands and Intracoastal often sit on elevated block foundations with ductwork underneath. Humidity and occasional flooding corrode metal fittings and wash away old sealant. We replace compromised components and apply fresh mastic that bonds to damp surfaces, then verify with a pressure test before we leave.
Duct Sealing Services in St. Augustine South
Duct Sealing Services in St. Augustine South cover everything from spot repairs on a single loose connection to full-system sealing after hurricane damage or decades of deterioration. Our Duct Sealing team starts with a visual inspection and pressure test to map exactly where your air is escaping, then gives you a written price before touching anything. Most jobs take three to five hours. We also handle Air Duct Cleaning in St. Augustine South and Dryer Vent Cleaning in St. Augustine South if your system needs more than sealing.
After heavy summer storms, we get calls from homeowners near Old Moultrie Road and the Lighthouse area who notice weak airflow and moldy smells. Often the problem isn’t the AC unit. Wind-driven rain and attic humidity have shifted duct runs or degraded seals that were already marginal. A full sealing job restores airflow and stops the attic from breathing into your living space.
Post-Storm Damage Assessment
If your home took water in the attic or crawlspace during the last hurricane season, we inspect for disconnected ducts, saturated insulation, and corroded collars. We document what we find, seal what can be sealed, and flag what needs replacement so you’re not guessing.
Energy Efficiency Upgrades
Some St. Augustine South homeowners seal ducts as part of cutting cooling costs before summer peaks. We pressure-test before and after so you see the improvement in CFM delivery, not just a promise on paper.
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 St. Augustine South
Our trucks carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration products from Honeywell, Aprilaire, and Guardsman. We don’t use hardware-store tape or consumer-grade sealants. For St. Augustine South customers, that means we stock the right width of flex duct, the correct diameter collars, and mastic that cures in high humidity so your job isn’t delayed waiting on parts. Most repairs we finish same visit.
Common Duct Sealing Problems We See in St. Augustine South Homes
- Oak pollen infiltration through attic leaks. Live oaks dominate the canopy here, and spring pollen pulls directly into return ducts through gaps in attic connections. Sealing those paths stops the yellow dusting on your vents and reduces the load on your filter.
- Condensation in sagging flex runs. Florida attic heat hits 140 degrees while your duct carries 55-degree air. When flex duct sags between supports, condensation forms, soaks the insulation, and breeds mold. We re-support and seal to eliminate the low spots.
- Disconnected collars after humidity cycles. The daily expansion and contraction of metal fittings in St. Augustine South’s humidity loosens duct tape and cracks old mastic. We find these failures during inspections on homes along Wildwood Drive and in the Lighthouse Park area regularly.
- Crawlspace moisture corrosion. Elevated homes near the Intracoastal have ducts in damp, vented crawlspaces where metal fittings rust and fiberglass insulation degrades. We replace corroded hardware and seal with materials rated for wet environments.
Pricing for Duct Sealing in St. Augustine South, FL
Whole-home duct sealing in St. Augustine South typically runs $450 to $1,200. Spot repairs on one or two accessible joints start around $180 to $350. Full replacement of deteriorated flex duct in a hot attic can reach $1,500 to $2,800 depending on linear footage and how many plenum connections we rebuild.
What moves the price: accessibility (tight attics take longer), the condition of existing fittings (rusted collars need replacement, not just sealing), and whether we’re working around insulation that also needs attention. 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. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near St. Augustine South
Hollis Air Duct Cleaning schedules duct sealing throughout Northeast and Central Florida, including Jacksonville, Miami, Tampa, and Orlando. Each location operates independently under The Garrison Standard with the same written pricing and 365-Day Done Right Promise.
Serving St. Augustine South, FL - Our Local Coverage Area
We’re based in the St. Augustine South 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 St. Augustine South
We typically schedule St. Augustine South appointments within two to four business days, with dispatch coordinated from our Miami office. Call (361) 326-5060 for the next available window.
Yes, we seal ducts throughout the area, including homes near Old Moultrie Road, the Lighthouse district, and the streets running toward the Intracoastal. If you’re in St. Augustine South, we service your neighborhood.
We answer calls live 24/7 and will schedule urgent appointments for post-storm damage or complete system failures. True emergencies that affect your ability to cool your home get priority scheduling.
Prices are comparable across our Florida markets. St. Augustine South’s older housing stock sometimes means more extensive repairs than newer suburbs, which can push some jobs toward the higher end of our range. We give exact written quotes before starting.
Every duct sealing job carries our 365-Day Done Right Promise in writing. If the seal fails or the repair doesn’t hold within one year, we return and make it right at no charge, including a free second visit. Call (361) 326-5060 to schedule your free estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving St. Augustine South under The Garrison Standard.