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 Massapequa
Duct sealing in Massapequa runs $450 to $1,100 for a typical single-family home, depending on how much of the duct network we can reach and how many failed joints we find. Most jobs take four to seven hours and we schedule within a few days, not weeks. If you’ve got rooms that never hold temperature, a furnace that runs constantly, or dust that reappears days after cleaning, the problem is probably air escaping your ducts before it ever reaches a register. That’s what we fix. Call (516) 559-4917 and we’ll give you a written price before any work starts.
Why Hollis Air Duct Hempstead Is Massapequa’s Preferred Duct Sealing Company
Roy Castellanos leads our crew, and he’s the one who answers when you call with questions about a quote. We work in Massapequa weekly, from the Shoreward section down to Biltmore Shores and up through the neighborhoods off Broadway. We know the housing stock here: split-levels with crawlspaces, high ranches with finished basements, and ranches with original sheet metal trunks that were sized for heat only, not the central air added decades later. That local knowledge changes how we approach every job because we’re not guessing at what’s behind a finished ceiling. We’ve already seen it on the next block over.
Every Massapequa job gets a written price before we touch a duct. The number is the number. Our technicians arrive uniformed and background-checked, inside the window we quoted. And every sealing or repair job is covered by the 365-Day Done Right Promise: if it fails within a year, we come back and make it right at no charge. That includes a free second visit. No fine print, no arguing. It’s in writing on every invoice.
Styles & brands we work with
HVAC Duct Sealing in Massapequa
HVAC Duct Sealing in Massapequa usually means finding where conditioned air is leaking from the duct network and closing those gaps with mastic or tape rated for sheet metal and flex. The job starts with a camera inspection of the entire supply and return system. That step matters more in Massapequa than most places because this town’s post-war split-level and high-ranch homes often mix original 1950s-era galvanized trunk lines with later flex-duct additions, creating pressure imbalances that make any sealant migrate unevenly. Seal a section without mapping the whole system and you can make airflow worse, not better. We camera the full run first, every time.
Pressure Imbalance Correction
A short-cycling air handler on a Massapequa split-level is rarely a thermostat problem. It’s usually a crushed flex run or a disconnected joint pulling negative pressure on the main trunk. We find it with the camera, repair the damaged run, then seal all accessible joints with mastic per NADCA standards. After sealing we balance the registers so each room gets the airflow the duct design intended.
Sealing in Finished Basements
Many Massapequa high ranches have finished basements where most of the trunk line is buried behind drywall. We seal what’s accessible through existing openings, diffuser boots, and return chases without tearing out ceiling. When the camera shows a leak we can’t reach from an existing opening, we tell you exactly where the drywall would need to open and what the repair would cost. You decide. We don’t start cutting without a written number in your hand.
Duct Repair in Massapequa
Duct Repair in Massapequa covers what sealing alone can’t fix: crushed flex runs, corroded sheet metal, disconnected boots, and transition points where mixed materials fail under Long Island humidity. When we find a 6-inch flex duct flattened behind a finished-basement ceiling, sealing around it does nothing. The run has to come out. On Shoreward Drive we sealed a split-level where the central air was short-cycling. The camera found exactly that: a crushed flex run pulling negative pressure on the main trunk. We repaired the run, sealed every accessible joint, and balanced the registers. The air handler stopped tripping its high-limit switch and the upstairs bedrooms finally held temperature.
Transition and Mixed-Material Repairs
Older Massapequa additions often connect galvanized trunks to newer flex duct. At those transitions, summer condensation collects and the sealant peels away from the metal under humid load. We repair the transition with mastic rated for both surfaces, then verify with a pressure test before we leave. A repair that holds for one hot August is not the standard. One that holds for a year is the minimum.
Crawlspace and Foundation Joints
On high ranches built in the 1960s, settling foundations pull duct joints apart in crawlspaces. Mastic alone cracks within a season if the structure keeps moving. We inspect the joint and the structure around it before sealing. If the foundation has settled and stabilized, we seal and move on. If it is still moving, we tell you, because sealing it again next year is not a repair, it’s a subscription.
Trusted Brands We Service in Massapequa
We work on systems built around Nikro negative-air machines and filtration from Honeywell and Aprilaire. If your Massapequa home has a media cabinet, an electronic air cleaner, or a whole-house filter from any of those brands, we carry or can source the matching sealing materials and replacement filters same week. We don’t swap in generic parts and call it equivalent. The equipment we run is the same roster commercial crews use: Rotobrush rotary brush systems for cleaning, Nikro negative-air for containment, and filtration verification from Honeywell and Aprilaire. If a brand-specific gasket or boot failed, we order the real part.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Massapequa Homes
- Settling foundations on high ranches pull apart duct joints in crawlspaces. The mastic seals crack within a season if the structure is not stabilized first. We check for movement before we seal so you’re not paying for the same repair twice.
- Mixed galvanized and flex duct in older additions creates condensation at the transitions. Under humid summer loads the sealant peels away from the metal. We use mastic rated for both surfaces and verify with a pressure test.
- Undersized returns in Shoreward-area homes choke airflow once the leaks are sealed. Sealing accessible leaks alone can worsen return-side static pressure and freeze the evaporator coil. We measure static before we seal, not after.
- Crushed flex runs behind finished ceilings pull negative pressure on the main trunk. The air handler short-cycles and upstairs rooms never hold temperature. The camera finds it, and we repair the run before sealing the system.
Pricing for Duct Sealing in Massapequa, NY
A typical whole-system duct sealing in Massapequa runs $650 to $1,100 when we can reach the trunk line, branch runs, and boots from the basement, crawlspace, or attic. Partial sealing of just the accessible supply runs runs $450 to $650. Duct repair, like replacing a crushed flex run or a corroded transition, adds $150 to $400 per repair depending on materials and access. Homes in Shoreward and Biltmore Shores with multiple additions and mixed duct runs tend to land at the upper end because the camera usually finds more than one failure point. The quote we give you before work starts is the price on the invoice. Call (516) 559-4917 for a free estimate.
We Also Serve Cities Near Massapequa
Our crews cover Massapequa and the surrounding communities, including Wantagh, Bellmore, Merrick, and Levittown. If you’re just over the town line and dealing with the same split-level duct problems, call and ask. We may already be in your neighborhood that week. You can also learn more about our Duct Sealing services or see what we do across Duct Sealing in Massapequa on our service area page.
Serving Massapequa, NY - Our Local Coverage Area
We’re based in the Massapequa 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 Massapequa
Dust returns after a cleaning because the ducts are pulling unfiltered air from the crawlspace, basement, or wall cavities through open joints and seams. Sealing those leaks stops the dust at the source instead of just removing what already collected. On Massapequa split-levels, the usual culprits are disconnected boots in crawlspaces and leaky returns behind finished basement walls. Call (516) 559-4917 and we’ll camera-inspect the full system to find where the dust is actually entering.
Yes, in most cases. We seal through existing openings: diffuser boots, return chases, access panels, and utility rooms. If the camera finds a leak we can’t reach from an existing opening, we’ll show you the footage and tell you exactly where drywall would need to open and what that repair costs. We don’t cut until you approve a written price for the whole job.
Because sealing accessible leaks without first measuring static pressure and mapping the full duct network often leaves the biggest leaks untouched, especially on ranches where the trunk line runs through an enclosed ceiling cavity. Our approach starts with a camera inspection of the entire supply and return system, then static pressure readings, then sealing. On Massapequa ranches with original 1950s sheet metal, the largest leaks are usually at the trunk-to-branch connections and return plenum, which a direct-seal-only crew never reaches. Call (516) 559-4917 for an honest assessment of what was done and what can be fixed.
No sealing method is safe if it disturbs asbestos. We do not run aerosol sealant through asbestos-wrapped ducts because the process can dislodge fibers. On those systems we seal accessible joints with mastic applied carefully at the exterior connections and recommend you have the asbestos wrapping professionally assessed before any cleaning or sealing work proceeds. Your health comes before any sealant. Call us and we’ll walk through what’s involved honestly.
Every three to five years for most homes, even with a properly sealed system. Massapequa’s humid summers and the amount of pollen and shore air that moves through these neighborhoods means fine particulate still enters through the return air and settles on coil surfaces and register boots. A sealed system keeps unfiltered crawlspace and wall-cavity air out, which reduces dust loading significantly, but the air moving through the house still carries particles that collect over time. Call (516) 559-4917 and we’ll give you a realistic interval based on your home and system.
If your Massapequa home has rooms that won’t hold temperature, a furnace that runs too long, or dust that comes back too fast, the ducts are talking to you. Call (516) 559-4917 for a free estimate and a written price before any work starts. Roy and the crew will show up on time, camera the system, and tell you exactly what’s wrong and what it costs to fix.
Written by Roy Castellanos, Owner at Hollis Air Duct Hempstead, serving Massapequa and the surrounding South Shore communities.