More than half of Floral Park was built before 1940. 52.5% of the village’s 5,658 housing units, 2,972 homes, date from 1939 or earlier, which puts the median house itself in that bracket. Another 32.3% went up in the 1940s and 50s, so 95.6% of the village was standing before 1980, and only 1.7% has been added since 2000. Floral Park is an incorporated village on the western edge of Nassau County, incorporated in 1908. Most of it lies in the Town of Hempstead; the section north of Jericho Turnpike is in the Town of North Hempstead. The Floral Park neighborhood over the line in Queens is a separate place in New York City and is not what we describe here.
72.0% of units are detached houses and 12.0% are in two-unit buildings, 679 homes, with 2.9% in buildings of three or four. 86.8% of occupied homes are owner-occupied. Heat is 80.5% utility gas, 13.4% fuel oil, 2.9% electricity and 2.3% bottled gas. The apartment buildings, 4.0% of units in buildings of ten to nineteen and 4.3% in buildings of twenty to forty-nine, are run as whole buildings by their owners, and a change to the roof or the outside walls is the owner’s decision, not one tenant’s.
The village covers 1.4 square miles with almost nowhere left to build, so insulation in Floral Park happens to old houses, most often while an owner is already renovating one.
The houses we insulate in Floral Park
The street names come from John Lewis Childs, who arrived in 1874 to sell seed, built America’s first seed catalog business, bought up land and named the streets after flowers. The railroad renamed its East Hinsdale station Floral Park in 1888, his flower beds covered more than 200 acres by 1903, and the village kept growing into the 1930s; Village Hall went up in 1936. The 2,972 houses built before 1940 belong to those decades.
A house from the 1900s through the 1930s was framed before anyone put insulation in walls. Behind plaster on wood lath the stud bays are empty, and in the older houses the framing is often balloon style, with bays running unbroken from the cellar to the attic. The attic is frequently a board floor over shallow joists, or a finished room under the roof with knee walls and sloped ceilings, and the cellar sill and rim sit bare on the foundation. Knob-and-tube wiring is possible at this age, and we find out whether any of it is live before a wall or attic floor is covered.
The post-war houses, 611 from the 1940s and 1,219 from the 1950s, are the capes, small colonials and early ranches of that era. The cape loses heat around its half-story: knee walls with a thin batt facing the room and open attic behind, floor joists running under them to the eave, and rafters too shallow to hold much in the slopes. The small colonial has a low hatch attic with a few inches of old fill. The 6.6% from the 1960s and 4.1% from the 1970s add split-levels and ranches, with a bedroom over the garage.
Two-unit buildings are 12.0% of the village. One roof, one cellar and usually one stair serve both apartments, so we scope the building as a whole: the attic over the upper unit, the framing band between the floors, the stair hall and the rim. On gas, 80.5% of homes, savings land on the National Grid bill; in the 13.4% still burning oil, they show up as fewer deliveries.
A built-out village: insulate while the walls are open
Only 0.3% of Floral Park was built in the 2010s and 0.1% since 2020. Houses here are not replaced; they are renovated, one kitchen, bath, roof or attic room at a time. Each of those projects opens part of the building shell for a few days, and that is the cheapest moment the wall, ceiling or roof will ever have for insulation. Once the drywall is hung, the same result costs more.
A kitchen or bath on an outside wall is the common case. With the plaster and lath off, the stud bays are open, and New York’s energy code expects exposed wall and roof-ceiling cavities to be insulated to full depth when an alteration opens them. An older wall with full-dimension studs is a deep bay. Closed cell foam air-seals it and packs the most R-value into the space; open cell foam or dense-packed fiber fills it for less. Either way the top and bottom plates and every pipe and wire hole get sealed first, so the rebuilt wall stops acting as a flue for cellar air.
A new roof is the moment for the attic: with the roofing off, the eaves of a shallow attic can be reached from above and baffled properly, which is hard to do from inside a two-foot crawl. A dormer or attic-room conversion lets the knee walls, slopes and floor edges be built as a sealed, insulated shell from the start. Re-siding does the same for walls, since fill holes through the sheathing disappear under the new siding. The practical rule for a Floral Park owner is to call about insulation while the renovation is being planned, not after the walls are closed.
We seal before we insulate
Insulation slows heat moving through a material. Air moving through a gap carries heat straight past it, and an old house is full of gaps. In a balloon-framed Floral Park house the biggest of them run from the cellar to the attic inside the walls.
So in a pre-1940 house the work runs bottom to top. In the cellar: the sill and rim joist, the plumbing and flue holes, and the bottoms of any open wall bays. In the attic: the tops of the same bays, the chimney chase closed with sheet metal and high-temperature sealant, the stair door or hatch, the light boxes and the bath fan, which should vent outdoors. Then the attic floor gets insulated to depth and the walls get filled.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Floral Park
Most of our projects run between $3,500 and $12,500. In Floral Park the number moves with the age of the house and the access to it. A pre-1940 house with a board floor in the attic costs more than one with open joists, because the boards come up or the fill goes in beneath them, and filling closed walls from inside or outside costs more than an open attic. A cape is priced on its knee walls, slopes and eaves. A two-family is priced as one building. Work done during a renovation, with the cavities already open, usually costs less for a better result.
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 Floral Park
Floral Park’s electric company is PSEG Long Island on both sides of Jericho Turnpike, and most of the village is on National Grid gas lines. Because PSEG Long Island supplies the electricity, NYSERDA’s Comfort Home program does not apply to these houses. The programs that do are PSEG Long Island’s own and, for income-eligible households, EmPower+.
PSEG Long Island begins with a free Whole House Energy Assessment: a check of insulation and drafts, a thermal scan and a blower door test. Its 2026 list gives 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 PSEG Long Island’s participating contractors. Insulation counts only when it goes in with blower-door-assisted air sealing, and ductwork in unconditioned space has to be sealed. The list is written for single-family homes, so the owner of a Floral Park two-family should confirm with PSEG Long Island before counting on it.
NYSERDA’s EmPower+ pays for air sealing and insulation for income-eligible owners and renters: at no cost up to $14,000 for lower-income households, which in Nassau means at or below $98,925 a year for a family 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 taking new applications.
Each of these programs pays only through its own participating contractors, so check the program’s list before you sign. The federal insulation tax credit, Section 25C, ended for work placed in service after 31 December 2025, so a 2026 job carries no federal credit, 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 Floral Park
95.6% of Floral Park was built before 1980. New York’s first statewide energy code took effect on 1 January 1979, and the village’s pre-1940 and post-war houses were all built decades before it. Nassau County is Climate Zone 4.
The code in force is the 2025 Energy Conservation Construction Code of New York State, effective 31 December 2025. A new house under it needs R-49 in the ceiling, or R-38 over the whole ceiling where that depth runs uncompressed over the wall top plates at the eaves; R-30 floors, or R-19 plus R-7.5 continuous; basement and crawl space walls at R-15 continuous, R-19, or R-13 plus R-5 continuous; windows at U-0.27; and air leakage no higher than 3.0 air changes per hour at 50 pascals.
A house already standing is treated differently. Its unaltered parts do not have to meet that table, and New York does not require a blower door test when an existing home is insulated. But exposed wall and roof-ceiling cavities are to be filled to full depth with insulation of at least R-3 per inch, a rule that comes up constantly in a village of renovations. 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 Floral Park
Do you install insulation in Floral Park, NY?
Yes, on both sides of Jericho Turnpike. Most of what we see in Floral Park is old: 52.5% of the village was built before 1940, with plaster walls, empty stud bays, board-floored attics and bare cellar rims, and 32.3% dates from the 1940s and 50s, the capes and small colonials with knee walls and shallow attics. Two-family houses are scoped as whole buildings.
How much does insulation cost in Floral Park?
Most projects run $3,500 to $12,500. A post-war cape with an open attic and a basement rim sits toward the lower end. A pre-1940 house moves up when the attic has a board floor, when the walls must be filled from inside or outside, or when the cellar rim runs around a large footprint. A two-family is priced as one building. Insulating during a renovation, while cavities are open, usually costs less than coming back later. After a free walk-through you get a written scope and price.
Are there insulation rebates in Floral Park?
Yes. Floral 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, with 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 customers. Income-eligible owners and renters can check EmPower+ on the MyEnergy portal. There is no federal 25C credit on a 2026 job, and New York has no state insulation credit.
We are gutting the kitchen of our 1920s Floral Park house. Should we insulate the outside wall while it is open?
Yes, and before the electrician and plumber close anything up. With the plaster off, those stud bays are as reachable as they will ever be, and New York’s code expects exposed cavities to be insulated to full depth anyway. We check that no old wiring in the bays is live, seal the plates and every pipe and wire hole, then fill the bays, often with closed cell foam, which air-seals and gets the most R-value into the depth. Give us the demolition date and we will work around your contractor.
Free energy audit in Floral Park
In a Floral Park house we start in the cellar: the sill and rim, the bottoms of the wall bays, and how the boiler or furnace vents. Then the rooms, to find which outside walls are empty, and the attic floor, eaves, chimney and hatch, or the knee walls and slopes of a cape. If a renovation is coming, show us the plans. If the attic is already fine, we say so. Then a written scope and a price, 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 North New Hyde Park
- Insulation in Elmont
- Insulating an older home
- Wall insulation
- Air sealing