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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AfterFast, Reliable Duct Sealing Across Westchester
Duct sealing in Westchester typically runs $450 – $1,200 for a whole-home system, with most single-family jobs landing in the $600 – $900 range. We dispatch crews from our Miami office and can usually book Westchester appointments within 48 hours. Call (361) 326-5060 for a free written estimate.
We’ve worked in Westchester long enough to know the drill: homes built between the 1970s and 1990s, fiberglass duct board sweating in the attic, flex duct runs that have loosened at the collars, and afternoon thunderstorms that send homeowners climbing up to check ceiling vents for water stains. The Garrison Standard means we arrive inside the quoted window, price the job in writing before we touch anything, and leave the site clean. Our Duct Sealing team handles everything from spot repairs to full-system resealing for the ranch-style homes and split-levels that dominate this neighborhood.
Why Hollis Air Duct Cleaning Is Westchester’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. In Westchester, that longevity matters. We’ve sealed ducts in the tract homes off SW 24th Street, near Bird Road, and throughout the neighborhoods around Tropical Park. Roy Castellanos leads our operation, and our technicians are background-checked, uniformed, and expected to follow The Garrison Code on every job: arrive squared away, explain the work in plain terms, and never leave a homeowner guessing about the price.
Our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues. When a Westchester homeowner calls after smelling musty air following a storm, they reach someone who can book the appointment, not a machine promising a callback on Monday.
The 365-Day Done Right Promise backs every seal we apply. If our work fails within a year, we return and make it right at no charge, including a free second visit. That’s written on every invoice, not implied.
We understand the local housing stock. Westchester’s dense suburban layout, much of it built during the 1970s and 1980s construction boom, means original ductwork is often leaky, undersized, and prone to condensation in the South Florida climate. Sealing must address moisture control, not just air loss. That’s the difference between a crew that knows Westchester and one that’s reading from a generic checklist.
Duct Sealing Services in Westchester
Duct Sealing Services in Westchester address the air leaks that waste energy, pull humid outside air into your HVAC system, and create the musty odors that spike after summer thunderstorms. We seal supply and return ducts, air handler cabinets, and plenum connections using mastic and mesh reinforcement rated for South Florida’s year-round humidity. A typical whole-home duct sealing job in Westchester runs $600 – $900, with larger homes or systems with extensive flex duct replacement reaching $1,200. Spot sealing of accessible leaks starts around $450.
Attic Flex Duct and Plenum Sealing
Most Westchester homes have flex duct runs in the attic that connect to a central plenum. These collars loosen over decades of thermal cycling. We disconnect, reseat, and seal each joint with mastic, then pressure-test the system to confirm the fix holds.
Air Handler Cabinet and Return Sealing
The air handler itself is a common leak point that many crews skip. We seal the cabinet seams, filter rack, and return duct connections so humid attic air stops bypassing your filter and entering the conditioned space.
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.
Duct Insulation in Westchester
Duct Insulation in Westchester prevents the condensation that forms when cold supply air moves through hot, humid attic spaces. We install closed-cell foam insulation or replace degraded fiberglass wrap on duct board and flex runs, typically costing $400 – $800 for partial replacement or $900 – $1,500 for full attic re-insulation. This work pairs with sealing; insulation without sealing is a temporary fix because humid air still infiltrates through gaps.
Condensation and Mold Prevention
Westchester’s tropical monsoon climate means attics hit 130°F in July while ducts carry 55°F air. That temperature differential creates sweat on uninsulated or poorly insulated ducts. We size insulation to R-6 or R-8 standards and verify with thermal imaging where accessible.
Insulation Replacement for Failed Duct Board
Original fiberglass duct board in 1970s and 1980s Westchester homes often delaminates after decades of moisture exposure. When the board’s structural integrity is compromised, we replace sections and seal the new connections properly.
Trusted Brands We Service in Westchester
We carry equipment and materials from Rotobrush, Nikro, and Abatement Technologies on every Westchester job. That means no waiting for parts deliveries from a warehouse across the state. For filtration and moisture control products, we stock Guardsman and Honeywell components. When a Westchester homeowner needs a seal completed before a home sale inspection or before the wet season peaks, that local parts availability keeps the job moving.
Common Duct Sealing Problems We See in Westchester Homes
- Sealing only visible registers while ignoring attic flex runs. Many crews seal the supply registers you can see from the living room but leave the attic flex duct and air handler cabinet untouched. Humid outside air keeps entering the system, and the homeowner still gets musty odors after storms.
- Shared dryer vent stacks in dense tract housing. In Westchester, the 1970s – 1990s single-family homes often share plumbing and dryer-vent stacks. Sealing a dryer vent lint pathway isn’t just an appliance fix; it can affect neighboring units in the same stack and is a frequent source of musty odors after afternoon thunderstorms.
- Low-quality tape failing in year-round humidity. Standard foil tape degrades quickly in South Florida’s climate. We’ve peeled off tape jobs that lasted one season. We use mastic and mesh, rated for continuous moisture exposure, so the seal holds.
- Ignoring return duct leaks that pressurize the attic. When return ducts leak in a hot Westchester attic, the system pulls 130°F air into the return, overworks the AC, and drives up bills. We test and seal both sides of the system.
Pricing for Duct Sealing in Westchester, FL
Whole-home duct sealing in Westchester typically costs $600 – $900 for a standard single-family home up to 2,500 square feet. Larger homes or systems requiring extensive flex duct replacement run $1,100 – $1,200. Spot sealing of accessible leaks starts at $450. Duct insulation runs $400 – $800 for partial work or $900 – $1,500 for full attic re-insulation. We price by the system, not by the vent. The price we write down before work starts is the price on the invoice. No per-vent add-ons. No surprises when the van is in your driveway. Call (361) 326-5060 for a free written estimate.
We Also Serve Cities Near Westchester
Hollis Air Duct Cleaning dispatches crews throughout South Florida and maintains coverage in Jacksonville, Miami, Tampa, and Orlando. Each location operates independently under The Garrison Standard. If you’re outside Westchester, we can route you to the right crew.
Serving Westchester, FL - Our Local Coverage Area
We’re based in the Westchester 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 Westchester
Cleaning removes debris; sealing stops the air leaks that let new debris and humid outside air back in. In Westchester’s climate, with HVAC systems running nearly year-round, duct joints and collars loosen continuously. A system cleaned 12 months ago can already be pulling humid attic air through gaps that weren’t addressed. Call (361) 326-5060 and we’ll inspect the seal integrity during your next service.
Yes, if the odor is caused by humid outside air entering through leaks and condensing inside the duct system. We were called to a home near Coral Way and SW 87th Avenue where the homeowner reported musty odors and water stains around ceiling registers after a wet-season storm. Our tech ran a camera inspection and found the original fiberglass duct board in the attic was leaking at the seams, pulling humid outside air into the supply and return ducts. We sealed the leaks with mastic and mesh, then used agitation tools under negative pressure with HEPA filtration to remove the microbial growth before installing new duct insulation. Call (361) 326-5060 if you’re seeing the same pattern.
Many Westchester homes share dryer vent stacks through common walls or roof assemblies, especially in the denser tract developments built in the 1970s and 1980s. Sealing only your unit’s connection while leaving the shared stack unsealed lets lint and moisture migrate between units. We inspect the full stack path and seal at all accessible points so the fix holds for the whole building, not just your laundry room.
Yes. Sealing only supply ducts while ignoring return leaks is incomplete work. In Westchester’s older homes, return ducts often run through hot attics and pull 130°F air through gaps, overworking the AC and spiking energy bills. We seal both sides and pressure-test the complete system.
We use professional-grade mastic and reinforcement mesh rated for continuous humidity exposure, plus negative-air HEPA containment from Nikro and rotary brush systems from Rotobrush when cleaning precedes sealing. For insulation and moisture control, we stock Guardsman and Honeywell products. These are the same tools commercial crews use, not hardware-store supplies. Call (361) 326-5060 for specifics on your job.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Westchester and the greater Miami area since 2004.