Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Fast, Reliable Duct Sealing Across Westbury
Leaky ducts in Westbury don’t just waste energy. They pull humid Long Island air into your system, coat your evaporator coil in grime, and push musty smells through every vent. Hollis Air Duct Hempstead seals ductwork the way it should be sealed: source-removal cleaning first, then a UL 181-rated mastic and mesh system applied to every failed seam. If you’re in Westbury and you’re tired of rooms that never cool evenly or odors that come back weeks after a cleaning, call (516) 559-4917. We write the price down before any work starts, and the 365-Day Done Right Promise backs the job in writing for a full year.
Why Hollis Air Duct Hempstead Is Westbury’s Preferred Duct Sealing Company
Westbury homeowners call us because we approach duct sealing as a diagnostic job first. We don’t show up with a fogger and a coupon. We show up with camera inspection equipment, a negative-air machine, and a written scope of work. Crews serving Westbury are dispatched from our New York City office, and every technician on the truck is background-checked and uniformed. You know who’s walking into your home before they get there.
Our work in Westbury spans the full range of housing stock here: early 20th-century colonials near the LIRR station, 1950s-60s split-levels along Post Avenue, and 1980s-90s colonials in the neighborhoods south of Old Country Road. Each of those eras has its own duct failure patterns. We know them because we’ve worked in them. When you call, you talk to a live person, 24/7. Not a voicemail loop.
Roy Castellanos leads our crew. He’s held a simple standard since day one: arrive inside the window, price it in writing before touching the system, do the job by the book, and leave the site cleaner than we found it. That’s the Garrison Standard. No bait pricing. No moving targets at the door.
Styles & brands we work with
HVAC Duct Sealing in Westbury
HVAC duct sealing in Westbury means locating every air leak in your duct network and sealing it with materials that hold up to this climate. That’s the key distinction. Salt air from the Atlantic and summer humidity levels that stick around for months accelerate corrosion on galvanized steel, dry out duct tape adhesive, and pull flex duct seams apart. A proper sealing job here has to account for all three. We start with a camera inspection to map the system, then source-remove dust and debris with a Nikro negative-air machine, then apply sealing at every joint, plenum connection, and return leak we found. Typical whole-system duct sealing in Westbury runs $850 – $2,200 depending on the home’s size, duct accessibility, and how many failed connections we’re correcting.
Pressurized Leak Testing
Before we seal, we test. A blower door or duct pressurization test tells us how much air your system is losing and where. In Westbury’s mid-century split-levels, the numbers are often stark: 25 – 40% of conditioned air leaving through seams in basements, attics, and crawlspaces. After sealing, we re-test to verify the improvement.
Access Panels and Hard-to-Reach Runs
Some Westbury duct runs are buried in finished ceilings or behind drywall. In those cases we cut clean access panels, seal from the inside, and re-install the panel so it disappears. You don’t get a patch job that shows. We leave the site looking like we were never there, except for the air pressure difference.
Duct Repair in Westbury
Duct repair in Westbury is what happens when sealing alone isn’t enough. Corroded galvanized sections, collapsed flex branches, and disconnected boots all require physical repair before any sealing product goes on. We replace failed sections with code-compliant materials, strap sagging flex runs, and re-hang disconnected trunk lines. A straightforward duct repair job in Westbury – say, replacing a 10-foot section of collapsed flex or a corroded return elbow – typically runs $350 – $900. Larger trunk line replacements in finished basements can run higher, and we write that number down before we start.
Corrosion Repairs in Older Westbury Homes
Homes built before 1980 in Westbury often have galvanized steel ducts that have spent decades in damp basements and humid unconditioned spaces. The zinc coating breaks down, rust forms at the seams, and pinhole leaks appear. We cut out the failed section and splice in a replacement, then seal every seam with mastic rated for the pressure class of your system.
Flex Duct Sag and Separation
In Westbury’s 1980s-90s colonials, flex duct routes through unconditioned attics and crawlspaces. Sagging between joists pulls the inner liner away from the connection collar, and airflow escapes into spaces that don’t need conditioning. We re-support the run with proper strapping, reconnect the collar, and seal the connection. If the flex is collapsed or mold-stained, we replace it rather than seal over a failing substrate.
Trusted Brands We Service in Westbury
We service and seal systems built around equipment from Honeywell, Aprilaire, and Guardsman filtration products, alongside the Rotobrush and Nikro cleaning equipment we run on every Westbury job. We stock common sealing materials and replacement parts in our service vehicles, which means most Westbury repairs happen same-visit rather than waiting on a parts order. If your Aprilaire filter housing has a leak at the cabinet seam or your Honeywell zoning damper is pulling air from the wrong side, we handle it the same day we’re on site.
Common Duct Sealing Problems We See in Westbury Homes
- Salt air corrosion at galvanized seams. Westbury sits close enough to the Atlantic that salt-laden air works its way into basements and crawlspaces. Over two or three decades, galvanized ducts develop rust blooms at every seam and pinhole leaks throughout. Sealing these requires cleaning the surface to bare metal first, then applying mastic – not spraying a coating over active rust.
- Sagging flex duct in 1980s-90s colonials. Homes built during that era in Westbury’s newer sections often used flexible duct in unconditioned attics. Gravity and heat cycles pull the inner liner away from connection collars, re-opening leaks within a season even after sealing. If the flex has sagged more than a foot between supports, we strap it. If it’s collapsed or mold-stained, we replace it.
- Undersized returns in mid-century split-levels. Westbury’s 1950s and 60s split-levels were built for the HVAC equipment of that era. When a modern high-efficiency system goes in, the return side is often too small. That creates negative pressure that pulls humid attic or crawlspace air into every tiny leak in the supply side. Sealing the supply without addressing the return imbalance can make the problem worse. We test, then fix the whole network.
- Original asbestos tape on older seams. In the older sections of Westbury near the LIRR station, many homes still have original ductwork with asbestos tape sealing the joints. That tape is stable if left alone, but disturbing it during cleaning or sealing releases fibers into the airstream. We identify it during camera inspection and handle it with encapsulation or abatement protocols – never by scraping or sanding it off.
See the difference
Before
After
Before
After
Before
AfterPricing for Duct Sealing in Westbury, NY
Whole-system duct sealing in Westbury typically runs $850 – $2,200. That’s the honest range for a house between 1,200 and 3,000 square feet, based on how many linear feet of duct we’re sealing, how much of it is accessible, and whether we’re also repairing corrosion or replacing failed flex. Duct repair alone runs $350 – $900 for most jobs, with larger trunk line replacements going higher. What affects the final number most in Westbury is the age of the ductwork: a 1960s split-level with original galvanized and asbestos tape will cost more to do properly than a 1990s colonial with clean flex. We give you one written price before any work starts. It doesn’t move. Call (516) 559-4917 for a free estimate.
We Also Serve Cities Near Westbury
Our Duct Sealing crews serve Westbury and the surrounding communities, including Hicksville, East Meadow, Hempstead, and Levittown. If you’re in Duct Sealing in Westbury or any neighboring town, the same team, the same pricing standards, and the same 365-Day Done Right Promise apply. One phone number covers it all.
Serving Westbury, NY - Our Local Coverage Area
We’re based in the Westbury 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 Westbury
Yes. Asbestos tape on older duct joints in Westbury – especially in homes near the LIRR station – gets encapsulated or removed under controlled conditions, not scraped or sanded. If encapsulation is appropriate, we seal over the tape with a bridging mastic system that keeps fibers contained and adds a positive seal on top. If the tape is damaged or friable, we coordinate with a licensed asbestos abatement contractor before proceeding. The 365-Day Done Right Promise still applies to the sealing work we perform. Call (516) 559-4917 and we’ll tell you exactly what your system needs after a camera inspection.
Sealing eliminates the source of the odor, not just the symptom. Musty smells in Westbury homes come from humid air being pulled into the duct system through leaks, condensing inside, and feeding microbial growth on dust and insulation. Source-removal cleaning removes what’s there; sealing stops the moisture from coming back. If the ducts aren’t sealed, the odor returns within weeks, because the condition that caused it never changed. Call (516) 559-4917 for a quote on sealing your system properly.
Look in your attic or crawlspace on a hot day. If you see flex lines sagging between supports, especially in Westbury’s 1980s-90s colonials, the inner liner has likely separated from the connection collar somewhere along the run. Another sign is warm air at a supply vent when the AC is running, or a burst of dust when the blower kicks on. Flex duct that’s sagged badly, collapsed, or mold-stained should be replaced, not sealed over. Our camera inspection shows you exactly what’s failed before we quote anything. Call (516) 559-4917 for a free estimate.
In Westbury’s split-level homes, the most common reason is an undersized return plenum. When the return side can’t pull enough air, the system goes into negative pressure and draws unconditioned air from the attic, the crawlspace, or the garage into the supply side – through every leak that sealing didn’t reach, and sometimes through the blower cabinet itself. Cooling capacity drops, especially upstairs. We diagnose this with static pressure testing and repair it by enlarging the return, rebalancing the runs, or sealing the cabinet. Call (516) 559-4917 if you’ve already paid someone and the problem didn’t go away.
It reduces the moisture drive, which is the part that accelerates corrosion. Salt air alone doesn’t rust steel – moisture does. In Westbury, humid air drawn into leaky ducts condenses on cool metal surfaces and creates a brine film, and that’s what eats through galvanized coating. Sealing the ducts stops humid air from entering, which stops the condensation cycle, which slows corrosion at the seams. Sealing won’t reverse existing rust damage; that’s what duct repair is for. Call (516) 559-4917 and we’ll tell you what’s salvageable and what needs replacing.
Contact Hollis Air Duct Hempstead for Duct Sealing in Westbury
On a split-level off Post Avenue, our crew found a 1960s galvanized supply trunk with heavy corrosion at the joints from decades of salt air and condensation. We used camera inspection to map every failed seam, then applied a UL 181-rated mastic and mesh system after source-removal cleaning, restoring static pressure to design specs and eliminating musty odors that fogging alone had never touched. That’s the job we do in Westbury. One written price before we start. A full year of coverage after we finish. Call (516) 559-4917 for a free estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Hempstead, serving Westbury and surrounding communities.