Four North New Hyde Park homes in five were built in the space of twenty years. 80.3% of the hamlet’s 4,952 housing units date from the 1940s and 50s, and the 1940s alone account for 46.1%, 2,282 homes. The median home was built in 1949, 95.5% of the stock predates 1980, and only 3.3% has been built since 2000.
North New Hyde Park is an unincorporated hamlet in the southwestern part of the Town of North Hempstead; a small piece with no residents lies in the Town of Hempstead. Its name comes from sitting immediately north of New Hyde Park, but the Incorporated Village of New Hyde Park is a separate municipality; for the village, see insulation in New Hyde Park. The hamlet also takes in the neighborhoods of Floral Park Centre and Lakeville Estates, which are not part of the Village of Floral Park.
94.1% of units are detached houses, 2.4% are attached single-family homes and 2.0% are in two-unit buildings. Buildings of ten or more units do not register at all, and 96.1% of occupied homes are owner-occupied, so nearly every house here is insulated, or not, on its owner’s decision. Heat is 74.3% utility gas, 18.5% fuel oil, 5.1% bottled gas and 2.2% electricity.
The houses we insulate in North New Hyde Park
Houses of the 1940s were built small: capes with an upstairs under the roof, small colonials and early ranches. Capes of that era often left the upstairs unfinished for later owners to build out, so in many of them the ceiling of a first-floor room is the floor of a bedroom, not an attic floor. What surrounds that bedroom is the insulation problem: knee walls framed by an owner with a batt or nothing behind them, floor bays under the knee walls open to the eaves, sloped ceilings with an inch or two of space, and a small flat attic above reached through a closet or a panel in the ceiling.
The 1950s houses, 34.2% of the stock and 1,695 homes, are ranches and capes from the decade the Lake Success Shopping Center opened on Union Turnpike, in 1956. A ranch keeps its losses in one attic: a few inches of old insulation, thinner over the outside walls, with open tops of interior walls, ceiling fixtures and a plumbing stack underneath. Below, the basement rim is bare framing on the foundation, and where a basement was finished later, the rim is behind paneling that was never insulated.
The 9.9% built before 1940, 490 homes, are older frame houses; the hamlet’s designated landmark, the Denton House on Jericho Turnpike, kept its exterior when it became a McDonald’s. Houses of that age may be balloon-framed with empty walls and knob-and-tube wiring, and we check for live wiring before filling anything. The 4.0% from the 1960s add split-levels with a room over the garage. The 2.2% from the 2010s have insulated walls; their losses are ductwork in the attic and the room over the garage.
The 2.4% of attached single-family homes share a wall with a neighbor. Where that wall stops at the attic floor instead of continuing to the roof, the two attics are one air space, and sealing it is part of the job. On gas, 74.3% of homes, savings show on the National Grid bill; on oil, 18.5%, or bottled gas, 5.1%, they show as fewer deliveries.
One job or three: the order that works in a North New Hyde Park house
If you are insulating in stages, around a budget or other projects, the order matters. Some steps bury the access the next one needs, and doing them backward costs more and leaves gaps.
Electrical work comes before anything. A knob-and-tube check, new circuits, ceiling fixtures and a bath fan ducted outdoors all go in before the attic is sealed and insulated. An electrician who has to wade through a foot of fresh insulation afterward disturbs it and cuts new holes in the air barrier.
The first stage is the attic and the rim, the top and bottom of the house, where the largest leaks are. Seal the top plates, the plumbing stack and chimney gaps, the hatch and the fixtures, baffle the eaves, insulate to depth, and foam the rim joist in the basement. In a 1940s cape the knee walls, the floor bays beneath them and the slopes belong to this stage too, because they are the upstairs’ attic.
The second stage is anything a later project will cover. If a basement is going to be finished, the rim and foundation walls get insulated before the framing goes up. If the upstairs of a cape is going to be redone, the slopes and knee walls are done with the walls open. The third is the outside walls, cheapest when the house is being re-sided.
Heating equipment comes last. A new boiler or furnace should be sized for the house after the attic, rim and walls are done, not before. And if you plan to use PSEG Long Island’s rebates, ask the program how it treats work done in parts before you split the job; its rules pair insulation with comprehensive air sealing.
We seal before we insulate
Insulation slows heat through a surface. It does nothing about air moving through a hole. In a 1940s house the same holes run top to bottom: the plumbing stack and the chimney pass from the basement to the attic, and warm air rides up beside them.
In a North New Hyde Park house the order is: in the basement, the sill and rim joist and the gaps where the stack, the flue and the wiring leave the basement; in the attic, the same stack and chimney where they arrive, the top plates of every wall, the ceiling fixtures, and the hatch, weatherstripped and insulated on top; behind the knee walls of a cape, the open floor bays blocked. Then the baffles at the eaves, and then the insulation.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in North New Hyde Park
Most of our projects run between $3,500 and $12,500. A 1940s or 1950s house with an open attic and a basement rim often sits toward the lower end. A cape with a finished upstairs moves up with its knee walls, floor bays and slopes, and filling the outside walls moves it further. Doing the work in stages is possible, but three separate visits usually cost more in total than one.
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 North New Hyde Park
North New Hyde Park’s electric company is PSEG Long Island, and National Grid gas lines are common through the hamlet. PSEG Long Island homes are not eligible for NYSERDA’s Comfort Home program, so the rebates here are PSEG Long Island’s, plus EmPower+ for income-eligible households.
The first step is PSEG Long Island’s free Whole House Energy Assessment, which includes a check of insulation and drafts, a thermal scan and a blower door test. 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, and pays them through its participating contractors. Single-family homes heated with oil, natural gas, propane or electricity are all eligible. Insulation has to be installed with blower-door-assisted air sealing.
EmPower+, NYSERDA’s program for income-eligible owners and renters, pays for air sealing and insulation at no cost up to $14,000 for lower-income households (at or below $98,925 for a Nassau household of four) or half the cost up to $7,000 for moderate-income households (below $131,900 for four); Long Island households should check eligibility on the MyEnergy portal. National Grid’s Long Island insulation rebate program is not accepting new applications. If budget is the reason to stage the work, NYSERDA’s Green Jobs–Green New York program offers unsecured loans of $1,500 to $25,000 over 5, 10 or 15 years after a no-cost energy assessment. A loan is paid back, not a rebate, and PSEG Long Island customers apply for the on-bill version directly through PSEG Long Island.
Each program pays through its own participating contractors, so confirm the contractor with the program before signing. The federal Section 25C insulation credit 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. Read more in our New York and New Jersey rebate guide.
Code and climate in North New Hyde Park
95.5% of North New Hyde Park was built before 1980. New York’s first statewide energy code took effect on 1 January 1979, about thirty years after the median house here went up. Nassau County is Climate Zone 4.
New houses now follow the 2025 Energy Conservation Construction Code of New York State, in force since 31 December 2025. It calls for R-49 in ceilings, with R-38 allowed where it covers the entire ceiling at full, uncompressed height over the wall top plates at the eaves; R-30 floors; basement and crawl space walls at R-15 continuous, R-19, or R-13 plus R-5 continuous; U-0.27 windows; and air leakage of 3.0 air changes per hour or less at 50 pascals.
An existing house does not have to catch up to that table. Parts left unaltered need not comply, and New York does not require a blower door test when an existing home is insulated. When a project opens wall or roof-ceiling cavities, such as a cape upstairs being redone, the exposed cavities are to be insulated to full depth. ENERGY STAR recommends R-60 for an attic with no insulation in this zone, and R-49 for one that already has 3 to 4 inches.
Common questions about insulation in North New Hyde Park
Do you install insulation in North New Hyde Park, NY?
Yes, including Floral Park Centre and Lakeville Estates. Most of the hamlet is the 1940s and 50s house, 80.3% of the stock: capes with finished upstairs rooms, knee walls and open floor bays, small colonials and ranches with thin attic insulation and bare basement rims. We also work on the older houses built before 1940, after a wiring check, on attached homes with shared attics, and on the few newer houses where attic ducts are the problem.
How much does insulation cost in North New Hyde Park?
Most projects run $3,500 to $12,500. A 1940s or 1950s house with an open attic and a basement rim often lands toward the lower end. A cape with a finished upstairs adds knee walls, floor bays and slopes, and filling outside walls adds more. Work split into stages is priced stage by stage, and it usually costs more in total than one visit. You get a written scope and price after a free walk-through.
Are there insulation rebates in North New Hyde Park?
Yes. The hamlet 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, with more for income-qualified homes, paid through its participating contractors after a free Whole House Energy Assessment. Comfort Home is not an option for PSEG Long Island customers. Income-eligible owners and renters can check EmPower+ on the MyEnergy portal. The federal 25C credit is gone for 2026 work, and New York has no state insulation credit.
We can only do part of the job this year. What should come first in our 1940s house?
Any electrical work planned for the attic, then the attic and the basement rim. Those are the top and bottom of the house, where most of the air leaks, and sealing them usually returns the most for the money. In a cape, the knee walls, the open floor bays beneath them and the slopes count as the attic. Leave the outside walls for when the house is re-sided, and replace the boiler or furnace after the insulation, so it is sized for the tighter house.
Free energy audit in North New Hyde Park
In a North New Hyde Park house we start in the basement with the rim, the sill and the holes where the stack, flue and wiring rise, then go up to the attic and behind the knee walls of a cape. We ask what else is planned, a finished basement, new siding, a new boiler, so the insulation can be ordered around it. If the attic is already in good shape, we say so. Then a written scope and a price, staged if you want it that way, with no charge and no obligation.
Call 914-825-6824 or use our contact form. We are open 8am–8pm, seven days, and work out of New Rochelle, NY with a 100-plus in-house crew that never subcontracts.
Learn more
- Insulation contractors across Nassau County
- Insulation in New Hyde Park
- Insulation in Floral Park
- Insulation in Mineola
- Attic insulation
- Basement and rim joist insulation
- What happens during an energy audit