29.9% of Melville’s 7,519 homes were built in a single decade, 2000 to 2009, and 35.8% have gone up since 2000. The median home dates from 1985. 23.2% of the stock is townhouses and other attached single-family homes, 58.5% is detached houses, and 87.5% of occupied homes are lived in by their owners.
That makes Melville a different kind of insulation market from the post-war hamlets around it. A house built in the 2000s already has insulated walls and a code-level attic, and blowing more into those walls is the wrong job. What costs a Melville owner money is air: ducts running through a hot or cold attic, tall walls that face an attic with nothing but a batt between them, rooms over garages, and fireplace chases open at the top. 76.1% of occupied homes heat with utility gas, 13.3% with fuel oil and 7.7% with electricity, so for most owners the loss shows on the National Grid bill in winter and the PSEG Long Island bill in summer.
Melville is a hamlet in the Town of Huntington, on the east side of the Nassau County line, crossed by the Long Island Expressway, the Northern State Parkway and Route 110. Twice, in the 1950s and in 2001, Melville and its neighbors in the Half Hollow Hills school district proposed incorporating as a single village, and both plans failed, so it remains a hamlet governed by the town.
The houses we insulate in Melville
The Native American name for the area was Sunsquams. It was later Samuel Ketcham’s Valley, then Sweet Hollow, likely for its honey bees, and “Melville” first appears in school records in 1854, probably from mel, Latin for honey. A Presbyterian church went up in 1829 at Old Country and Sweet Hollow Roads, and a trolley to Huntington ran from 1909, with a fare zone at the Duryea Farm, until farmers complained it frightened their animals. 300 of today’s homes predate 1940. In those farmhouses we assume open wall cavities and old wiring until we have looked.
The 1950s left 1,051 homes and the 1960s 1,159, while office development spread along Route 110, and the 1970s added 889: ranches, capes, high ranches and splits. They fail the way Long Island houses of that age fail: settled loose-fill thinning to nothing at the eave, an open gap around the chimney, a garage ceiling under a bedroom, and a rim joist that was never sealed.
The 1980s added 585 homes and the 1990s 753, mostly center-hall colonials with two-by-four walls holding batts, an attic over the second floor and a separate attic over the garage. The weak points are the wall between the garage attic and the bedrooms, the rim between floors, and a family room addition with a low-slope roof and no room above its insulation.
Then the 2000s: 2,251 homes in ten years, and 440 more from 2010 to 2019, many of them large detached colonials with two-story foyers. We come back to those houses below, because the job in them is not what most owners expect.
Melville also has 1,741 townhouses and other attached single-family homes, and a townhouse is its own case. The roof, the siding and often the attic above a row of units belong to an association, and the party wall between units is shared. The owner can usually decide on the rooms, the garage ceiling and the rim inside their own unit; the attic and anything on the outside go through the association’s rules. Buildings of ten or more units are envelopes their owners manage, not jobs for one apartment.
Built since 2000: the walls are full, and the air leaks are overhead
A Melville colonial from 2005 was built to the energy code of its day. Its walls hold batts, its attic has a code-level depth of loose-fill, and its windows are double-glazed. On paper it is an insulated house, and still the upstairs bedrooms run hot in July and the family room with the tall ceiling is cold in January. The reason is almost always overhead.
The heating and cooling for the second floor usually comes from an air handler sitting in the attic, with flexible duct running across the attic floor to each room. That attic is outdoors in everything but name: far hotter than the yard on a summer afternoon, close to the outside temperature on a winter night. Every leaky joint at the air handler, the return plenum and the duct boots dumps conditioned air into it, and duct buried under or lying on top of the insulation gains or loses heat along its whole length.
The rest of the list is short and specific. The two-story foyer or family room has a tall wall whose attic side is bare batts with no air barrier. Tray and vaulted ceilings were insulated in slopes too steep to hold loose-fill. The bonus room over the garage has open floor bays under its knee walls. A gas fireplace sits in a framed chase on an outside wall, and the chase is often open to the attic at the top and uninsulated on its outer face. Recessed lights and bath fans connect the rooms below to the attic above. None of that is fixed by more depth on the attic floor.
We seal before we insulate
Insulation slows heat conducting through a surface. It does nothing about air moving through a gap, and a two-story house with a tall foyer and an attic full of ductwork moves a lot of air.
In a 2000s Melville colonial the sequence is: seal the air handler cabinet, the return plenum and every duct joint and boot with mastic; seal the recessed lights, bath fans, top plates and attic hatch; put an air barrier on the attic side of the tall wall; close the top of the fireplace chase; block and seal the floor bays under the bonus room knee walls. Then insulate the attic floor to depth, the bonus room floor and knee walls, and the garage ceiling. In a 1960s ranch the order is the attic plane, then the rim and the garage.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Melville
Most of our projects run between $3,500 and $12,500. In a 2000s colonial the number moves with the footage of ductwork to seal, how many tall walls face the attic, whether there is a bonus room over the garage, and whether the fireplace chase can be reached from the attic. A townhouse is usually a smaller scope, limited to what the association allows. An older ranch with one attic plane sits toward the lower end. For the foam side of the number, see what spray foam costs.
Open cell foam runs R-3.9 to R-4.2 per inch. Closed cell runs R-6.9 to R-7.1 per inch and also acts as a vapor retarder, which is why it costs more and why it is right in some assemblies and unnecessary in others. All products are manufactured in the United States and meet applicable building code and safety standards. ENERGY STAR says sealing air leaks and adding insulation can save up to 10% on annual energy bills.
Insulation rebates in Melville
Melville buys its electricity from PSEG Long Island, and most of the hamlet is on National Grid gas lines. Because the electric company is PSEG Long Island, NYSERDA’s Comfort Home program is not available to Melville homes.
PSEG Long Island lists a $2,500 insulation rebate, a $1,000 air-sealing rebate and a $500 duct-sealing rebate for market-rate single-family homes, with higher amounts for income-qualified homes and homes in state-designated disadvantaged communities. Two of its rules fit a newer Melville house exactly: insulation must be installed with blower-door-assisted air sealing, and all ductwork in unconditioned space must be duct sealed. The rebates are paid through PSEG Long Island’s participating contractors after a free Whole House Energy Assessment, which includes a check of insulation and drafts, a thermal scan and a blower door test. PSEG Long Island’s rebate list is written for single-family homes, so a townhouse owner should ask PSEG Long Island before counting on it.
National Grid’s Long Island insulation rebate program is not taking new applications, and income-eligible households go through EmPower+. NYSERDA’s EmPower+ program can pay for air sealing and insulation at no cost up to $14,000 for lower-income households (at or below $98,925 for a Suffolk family of four) or half the cost up to $7,000 for moderate-income households (below $131,900 for four), through an EmPower+ contractor. Long Island households should check eligibility on the MyEnergy portal.
The federal insulation tax credit (Section 25C) ended for work placed in service after 31 December 2025, so there is no federal insulation credit on a 2026 job, and New York has no state tax credit for insulation. The rest is in our New York and New Jersey rebate guide.
Code and climate in Melville
46.4% of Melville’s homes were built before 1980, less than half. New York’s first statewide energy code took effect on 1 January 1979, so more than half of the hamlet went up after it, and 35.8% under the codes of the 2000s and later. Suffolk County is Climate Zone 4.
The current edition, the 2025 Energy Conservation Construction Code of New York State, has been in force since 31 December 2025. For a new house it requires R-49 ceilings, or R-38 over the entire ceiling where the uncompressed R-38 runs at full height over the wall top plate at the eaves; R-30 floors, which is the number that applies to a room over a garage; basement and crawl space walls at R-15 continuous, R-19, or R-13 plus R-5 continuous; windows at U-0.27; and no more than 3.0 air changes per hour at 50 pascals.
A house already standing is not held to that table. Unaltered parts do not have to comply, and New York’s code does not require a blower door test when you insulate an existing home. Where an alteration exposes roof or wall cavities, the exposed cavities must be insulated to full depth. ENERGY STAR recommends R-60 for an uninsulated attic in this zone and R-49 where 3 to 4 inches are already down.
Common questions about insulation in Melville
Do you install insulation in Melville, NY?
Yes. Much of our Melville work is the house built since 2000, 35.8% of the hamlet: sealing air handlers and ductwork in the attic, the attic side of two-story walls, bonus rooms over garages and fireplace chases, then topping up the attic floor. We also insulate the 1950s through 70s ranches and high ranches, the 1980s and 90s colonials, and townhouse units where the association allows the work. We do not work on the envelopes of the larger condominium and apartment buildings.
How much does insulation cost in Melville?
Most projects run $3,500 to $12,500. In a newer colonial the price follows the footage of ductwork to seal, the number of tall walls facing the attic, the bonus room and the fireplace chase, not the walls, which are already full. An older ranch with one attic plane and a rim joist sits toward the lower end, and a townhouse is usually smaller still. We give a written scope and price after a free walk-through.
Are there insulation rebates in Melville?
Yes. Melville is PSEG Long Island territory, and PSEG Long Island lists a $2,500 insulation rebate, a $1,000 air-sealing rebate and $500 for duct sealing for market-rate single-family homes, more for income-qualified homes, paid through its participating contractors after a free Whole House Energy Assessment. Comfort Home is not open to PSEG Long Island homes. Income-eligible households can apply to EmPower+. The federal 25C credit ended for work placed in service after 31 December 2025, and New York has no state insulation tax credit.
Our Melville house was built in the 2000s and the upstairs is hot every summer. Will more insulation fix it?
Not on its own. In most houses of that age the upstairs is fed by an air handler and ducts in the attic, and leaky joints there pour cooled air into a space far hotter than outdoors. The tall foyer wall, the bonus room floor and recessed lights let attic heat into the rooms. Sealing the ducts and air handler, sealing the ceiling and the tall wall, and then adding depth on the attic floor usually does fix it. Depth alone, over leaking ducts, mostly does not.
Free energy audit in Melville
In a newer Melville house we spend most of the time in the attic: the air handler, the duct runs and boots, the back of the tall wall, the top of the fireplace chase, the bonus room knee walls and the hatch. Then the garage ceiling and the basement rim. In an older ranch it is the attic plane, the chimney and the rim. If the attic floor is already deep enough and the loss is in the ducts, we say so. Then a written scope and a price. No charge, no obligation.
Call 914-825-6824 or use our contact form. Open 8am–8pm, seven days. We work out of New Rochelle, NY with a 100-plus in-house crew that never subcontracts.
Learn more
- Insulation contractors across Suffolk County
- Insulation in Dix Hills
- Insulation in South Huntington
- Insulation in Huntington Station
- Air sealing
- Insulating the floor over a garage
- Attic insulation