11.5% of Deer Park’s occupied homes heat with electricity, alongside 57.0% on utility gas and 27.5% on fuel oil. The houses are mostly from the boom that followed the Second World War: 33.5% of Deer Park’s 9,323 homes were built in the 1950s and 29.7% in the 1960s, the median dates from 1963, and 84.5% predate 1980. 81.1% are detached houses, 7.6% are townhouses and other attached homes, and 85.1% of occupied homes are lived in by their owners.
Deer Park is a hamlet in the northeastern corner of the Town of Babylon, bordered by Wyandanch and Wheatley Heights to the west, Dix Hills to the north, Brentwood and Baywood to the east and North Babylon to the south. It buys its electricity from PSEG Long Island, and National Grid gas is available on many streets, though not all of them. Most of our work here is the 1950s ranch and the 1960s high ranch, but electric-heated homes get their own look below.
The houses we insulate in Deer Park
Deer Park sits in the pine barrens, and for most of its history it was farmland. Charles Wilson started a large farm here in 1853, about eleven years after the Long Island Rail Road arrived, and the area was known as the “fruit basket” of New York State and famed for its dahlias. It stayed agricultural until the post-war boom reached it. 3.8% of today’s homes predate 1940 and 4.4% date from the 1940s; in the few farmhouses left we check the wall framing and the wiring before anything is blown into a wall.
The 1950s built 3,119 of Deer Park’s homes, the decade the Fairchild Engine and Airplane Corporation opened its factory here, and the house of those years is a one-story ranch or a cape. Loose-fill lies a few inches deep between the joists and stops short of the eaves. Gable vents at each end do most of the venting, and where there are soffit vents, the insulation has often been pushed over them. The top plates of the interior walls, the ceiling fixture boxes and the gap around the flue are open. Some attics of that era hold vermiculite, a gray-brown, pebbly loose-fill that can contain asbestos; it gets tested before anyone disturbs it or piles anything on top.
The 1960s added 2,768 homes and the 1970s 13.2% of the stock, mostly high ranches and splits. The high ranch is a house in two halves: bedrooms and kitchen up, a family room and garage half in the ground below, and a rim joist at eye level between them. Its losses are that rim, the garage ceiling under the bedrooms, a cantilever across the front and a long, simple attic. The 1990s added 7.4% and the 1980s 4.1%, mostly colonials with insulated walls, where the work is overhead.
Not everything in Deer Park is a detached house. There are 711 townhouses and other attached homes, 191 units in two-unit buildings, 230 in buildings of three or four units and 270 in buildings of fifty or more. A townhouse owner’s first question is whether the association or the owner controls the attic. The envelope of a fifty-unit building belongs to its owner or board, and that is a conversation for them, not for the owner of one apartment.
Electric heat in Deer Park: when the heating bill comes from PSEG Long Island
In the 11.5% of homes heated by electricity, PSEG Long Island supplies both the winter heat and the summer cooling, so the same leaks show up on the same bill twice a year: warm air escaping through the ceiling in January, and hot attic air pouring in through the same gaps in August.
Electric heat in a house of this age usually means baseboard. Sometimes it heats the whole house; often it heats a part that was added later, a finished basement, a room over the garage or a converted porch, and those added rooms are where insulation is thinnest. Each baseboard sits on an outside wall with its wire coming through the floor or the wall behind it, and every one of those holes, along with the outlet boxes on the same wall, lets cold air in right where the heater is trying to warm the room. A room over a garage with baseboard heat is often the costliest room to keep warm, and its floor is usually why.
If a heat pump is in your plans, seal and insulate first: it is sized to the heat the house loses, so a tighter house takes a smaller one. PSEG Long Island’s program ties its window rebate, listed at $4 per square foot for market-rate homes, to a whole-house cold climate air source heat pump installed together with, at a minimum, insulation and air sealing. Where central air or a heat pump runs ductwork through the attic, PSEG Long Island requires all ductwork in unconditioned space to be sealed, and lists $500 for duct sealing.
We seal before we insulate
Insulation slows heat conducted through a surface. It does nothing about air passing through a gap, and in a one-story ranch nearly every gap that matters is in the ceiling.
In a Deer Park ranch the order is: identify what the old loose-fill is, and test it if it looks like vermiculite; then seal the top plates, the fixture boxes, the plumbing vent and the bath fan, run the fan duct outside rather than into the attic, close the gap around the flue with sheet metal and high-temperature sealant, and weatherstrip and cover the hatch. Set a baffle at every rafter bay that has a soffit vent so the new insulation cannot block it. Then insulate the attic to depth, and seal the rim joist below. In a room heated by baseboard, seal the wire penetrations and the outlet boxes on the outside wall as well.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Deer Park
Most of our projects run between $3,500 and $12,500. A 1950s ranch attic with clean loose-fill sits toward the lower end. If the attic holds vermiculite, testing and any removal come before our work and are not part of it. A high ranch adds the rim at eye level, the garage ceiling and the cantilever. A room over the garage heated by baseboard adds a floor that has to be opened or filled from below. 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 Deer Park
Deer Park’s electric company is PSEG Long Island, and its gas company is National Grid, which reaches many streets but not every one. The electric company sets the rebate lane: because it is PSEG Long Island, NYSERDA’s Comfort Home program is not available to Deer Park homes.
PSEG Long Island lists a $2,500 insulation rebate and a $1,000 air-sealing rebate for market-rate single-family homes, with higher amounts for income-qualified homes and homes in state-designated disadvantaged communities, paid through its participating contractors after a free Whole House Energy Assessment with a check of insulation and drafts, a thermal scan and a blower door test. Homes heated by electricity, gas, oil or propane all qualify. The insulation must go in with comprehensive, blower-door-assisted air sealing, and its list names single-family homes, so if you own a townhouse, confirm with PSEG Long Island that yours qualifies. PSEG Long Island pays only through its participating contractors; check its list before you sign.
National Grid’s Long Island insulation rebate program is not taking new applications, and income-eligible households now apply to EmPower+. Through an EmPower+ contractor, NYSERDA’s program pays for air sealing and insulation at no cost up to $14,000 for lower-income Suffolk households (at or below $98,925 for a family of four), or half the cost up to $7,000 for moderate-income households (below $131,900 for four). Owners and renters can apply, and Long Island households should check eligibility on the MyEnergy portal.
Green Jobs–Green New York, a NYSERDA loan program, lends $1,500 to $25,000 unsecured over 5, 10 or 15 years, repaid on the utility bill or as a regular monthly loan, once a no-cost energy assessment is done. PSEG Long Island customers who want the on-bill version apply directly through PSEG Long Island. The federal insulation tax credit (Section 25C) ended for work placed in service after 31 December 2025, so there is no federal credit on a 2026 job, and New York has no state tax credit for insulation. The details are in our New York and New Jersey rebate guide.
Code and climate in Deer Park
84.5% of Deer Park’s homes were built before 1980. New York’s first statewide energy code took effect on 1 January 1979, so the ranches, capes and high ranches of the 1950s and 60s were built with no state energy rule at all. Suffolk County is Climate Zone 4.
The 2025 Energy Conservation Construction Code of New York State took effect on 31 December 2025. It asks a new house for R-49 in the ceiling, with R-38 accepted over the whole ceiling where uncompressed R-38 keeps its full height over the wall top plate at the eaves. It asks for R-30 in floors, R-15 continuous, R-19, or R-13 plus R-5 continuous on basement and crawl space walls, U-0.27 windows, and no more than 3.0 air changes per hour at 50 pascals.
An existing Deer Park house is not held to that list. Unaltered parts of the building do not have to comply, and New York’s code does not require a blower door test when you insulate an existing home. Where the work opens roof or wall cavities, such as a room over the garage whose ceiling comes down, 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 there.
Common questions about insulation in Deer Park
Do you install insulation in Deer Park, NY?
Yes. Most of our Deer Park work is the 1950s ranch and cape, 33.5% of the hamlet, and the 1960s high ranches and splits: attic floors, eaves, rim joists, garage ceilings and cantilevers. We also insulate electric-heated homes and the added rooms heated by baseboard, the 1980s and 90s colonials, and townhouse attics where the association allows the work. We do not take on the envelope of the larger apartment buildings, which belongs to their owners.
How much does insulation cost in Deer Park?
Most projects run $3,500 to $12,500. A 1950s ranch attic with clean loose-fill is usually toward the lower end. A high ranch adds the rim joist, the garage ceiling and the cantilever. A room over the garage heated by baseboard adds its floor. If the attic holds vermiculite, testing and any removal come first and are separate from our price. We give a written scope and price after a free walk-through of the house.
Are there insulation rebates in Deer Park?
Yes. Deer Park is PSEG Long Island territory, and PSEG Long Island lists a $2,500 insulation rebate and a $1,000 air-sealing rebate for market-rate single-family homes, more for income-qualified homes, paid through its participating contractors after a free Whole House Energy Assessment. Electric, gas and oil heat all qualify. Comfort Home is not available to PSEG Long Island homes. Income-eligible households can apply to EmPower+, and Green Jobs–Green New York offers loans. The federal 25C credit has ended, and New York has no state insulation credit.
The room over our Deer Park garage has baseboard heat and is always cold. What fixes it?
Usually the floor, not the heater. The garage ceiling under that room is often a thin layer of batts with gaps, and the joist bays between the garage ceiling and the bedroom floor can run open to the outside wall, so cold garage and outdoor air moves under the room all winter. We block and seal those bays at the rim, fill them completely, and seal the garage ceiling, including the joint with the house wall. Then we seal the baseboard wire holes and outlet boxes, and the knee walls or slopes if the room has them.
Free energy audit in Deer Park
In a Deer Park ranch we start in the attic: what the loose-fill is and how deep, whether the eaves are vented and blocked, the top plates, the fixture boxes and the flue. In a high ranch we add the rim, the garage ceiling and the cantilever. In an electric-heated room we look behind the baseboards and under the floor. If the attic is fine and the loss is one room over the garage, 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 North Babylon
- Insulation in West Babylon
- Attic insulation
- Insulating the room over a garage
- Air sealing