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 Bellmore
Duct sealing in Bellmore typically runs $450 – $1,400 for a whole system, depending on how much rust repair and bypass correction the job actually needs. Most homes here were built between 1950 and 1970, and the original metal ductwork in those capes, ranches, and split-levels has spent decades pulling salt-laden air from the Great South Bay through uninsulated attics and crawlspaces. That combination means sealing work in Bellmore rarely starts with tape. It starts with finding the leaks, the rust, and the disconnected runs hiding behind kneewalls. Call (516) 559-4917 for a written quote before any work begins.
Why Hollis Air Duct Hempstead Is Bellmore’s Preferred Duct Sealing Company
Hollis Air Duct Hempstead operates under the Garrison Standard, which means the price is written down before we touch anything and it does not move at the door. Our technicians arrive in uniform, background-checked, inside the quoted window. When we seal ducts in Bellmore, we walk the system with you first, show you where the air is escaping, and explain what the fix costs before we ask for approval. If you also need Bellmore Dryer Vent Cleaning, we can bundle that into the same visit.
We are part of the Garrison Partners family, in business since 2004. Our equipment roster includes Rotobrush rotary brush systems and Nikro negative-air machines, the same class of tools commercial crews use, not hardware-store gear. For Bellmore homes with salt-corroded ductwork, that equipment matters. A rotary brush can knock rust scale loose without damaging thin galvanized steel. A negative-air machine keeps the dust we stir up from settling back into your living room. Roy Castellanos leads our team, and the standard he enforces is simple: do it by the book, price it before you start, and stand behind it for a year.
Styles & brands we work with
Air Duct Sealing in Bellmore
Duct Sealing means restoring the continuity of the system that moves conditioned air from your furnace or air handler to the rooms you actually live in. In Bellmore, where original galvanized ductwork has spent 50 to 70 years in salt-humid air, sealing is rarely cosmetic. It means finding the pin-holes, the separated joints, the crushed returns, and the disconnected supply runs, then deciding what gets mastic, what gets foil tape, and what needs conversion treatment first.
Rust Repair Before Sealing
Salt air from the Great South Bay works into Bellmore crawlspaces and attics year-round. We regularly find rust pin-holes along the seams of original galvanized duct. If you seal over that without wire-brushing and rust converter, the seam fails again within a year. That is not a guess, it is what the thermal cycling in an uninsulated attic does: the metal expands in summer, contracts in winter, and any weak seam cracks open.
Bypass Correction
Disconnected runs behind kneewalls in cape-style second floors quietly pull fiberglass dust and attic air into the system. Sealing the main trunk means nothing if a 14-foot supply run is lying open eight feet away. We find those with pressure testing and visual inspection, then reconnect and seal them so the air you paid to condition actually reaches the room.
Duct Sealing Services in Bellmore
Duct Sealing in Bellmore jobs here typically cost $450 – $1,400 for a full system. That range reflects what we actually find in homes along the South Shore: some need straightforward joint sealing, others need rust scale removal, converter application, and reconnection of supply runs that were never hooked back up after a previous contractor left.
Whole-System Testing
We do not seal blind. Before and after the work, we test airflow at the registers and check for pressure loss. The goal is measurable: air that was bleeding into an attic or crawlspace should be reaching the rooms instead. On one split-level off Newbridge Road, our techs pulled a blower motor caked with beach sand that had blown past a collapsed return register. After a NADCA source removal with HEPA filtration and agitation tools, we sealed a 14-foot disconnected supply run with mastic and reinforced foil tape. The result was airflow you could feel at every register upstairs.
Materials Matched to the Job
Mastic-only seals on round metal joints crack under the thermal cycling of uninsulated attics that swing 40°F between summer air conditioning and winter heat. In Bellmore, we use mastic where it belongs and reinforced foil tape where flex duct meets metal. The materials are chosen for the conditions, not for the convenience of the installer.
What happens when you call
- 1
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 Bellmore
We carry sealing materials and filtration products from Aprilaire, Abatement Technologies, and Guardsman, along with Rotobrush rotary brush equipment for the cleaning work that almost always precedes a sealing job in Bellmore. When we need to replace a filter housing or a section of flex, we use components that match the system rather than whatever fits. That means faster turnaround when a Bellmore job calls for a specific part, because we stock for the housing stock we see: original 1950s-1970s metal duct, not modern flex runs.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Bellmore Homes
- Rust pin-holes along seams. Original galvanized duct in salt-humid crawlspaces corrodes from the outside in. Sealing without wire-brushing and rust converter first means the seam reopens within a year.
- Cracked mastic on round joints. Uninsulated attics in Bellmore swing hard between summer and winter temperatures. Mastic-only seals crack under that cycling, which is why we use it in combination with reinforced tape where the joint needs to flex.
- Disconnected runs behind kneewalls. Cape-style second floors hide supply runs behind finished walls. When one comes loose, it pulls fiberglass dust and attic air into the system, which undoes any sealing work on the main trunk.
- Beach sand in return ducts. Techs often find beach sand in return ducts of Bellmore homes, a telltale sign of years of windows-open living near Jones Beach. It means filters have been overwhelmed and the return path itself may be compromised, which is a leak point that sealing alone will not fix.
Pricing for Duct Sealing in Bellmore, NY
A typical whole-system duct sealing job in Bellmore runs $450 – $1,400. Jobs on single-story ranches with accessible ductwork land on the lower end. Split-levels and capes with runs through shallow attics and cramped crawlspaces land higher, especially when rust repair is needed first. We write the price before we start. It does not change at the door. If you want an exact number for your system, call (516) 559-4917 and we will schedule a walk-through. The estimate is free and the number you get is the number you pay.
We Also Serve Cities Near Bellmore
Beyond Bellmore, our crews cover Merrick, Wantagh, East Meadow, and Levittown. Many of those homes share the same mid-century construction and the same salt-air exposure, so the sealing issues we see there are consistent with what we find here. If you are in a neighboring community and dealing with ducts that have never been sealed, the fix is the same kind of work.
Serving Bellmore, NY - Our Local Coverage Area
We’re based in the Bellmore 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 Bellmore
Cleaning removes what is inside the ducts. It does not fix where the ducts are leaking. In 1960s split-levels, original metal ductwork has shifted, corroded, and separated over 50-plus years of salt air from the Great South Bay. A cleaning will make the system clean, but if a disconnected run behind a kneewall is still pulling attic air, the system is still losing airflow. Sealing is what closes those gaps. Call (516) 559-4917 and we will tell you which one your system actually needs.
Beach sand in a return duct means the return path has been pulling unfiltered air from somewhere. That is a breach. If sand got in, conditioned air is getting out. The fix usually involves sealing the return run and confirming the filter housing is intact. It is a common Bellmore finding because of the proximity to Jones Beach and decades of summer windows-open living.
You should expect the sealing work to close the leaks that are bleeding air before it reaches the upstairs registers. In a cape, those leaks are often behind kneewalls, where supply runs disconnect and release conditioned air into dead space. The result after sealing should be measurable airflow at the upstairs registers. If the upstairs rooms still do not cool afterward, the problem is elsewhere, and we will tell you that before you spend on work that will not fix it.
We wire-brush the rust scale off first, apply a rust converter to stop the corrosion, then seal with mastic and reinforced foil tape over the treated seams. If the metal is too thin to hold a seal, replacement is the honest answer. Replacement is not always required. But sealing over active rust is not a repair, it is a delay, and we will not do it.
After. Mold remediation removes the contamination. Sealing after that prevents the conditions that let mold return. If you seal first, you may trap moisture and contaminants inside the system. Bellmore’s proximity to the Great South Bay means humidity is a constant factor, so the order matters. Our team will coordinate with the remediation work and seal once the system is clean and dry.
Written by Roy Castellanos, Owner at Hollis Air Duct Hempstead, serving Bellmore and the surrounding South Shore communities.