More North Wantagh homes burn oil than gas. 54.5% of occupied homes heat with fuel oil and 36.5% with utility gas, with 7.5% on electricity and 0.9% on bottled gas. Most of those homes come from a single decade: the 1950s produced 68.1% of the hamlet’s 4,334 housing units, and the median home was finished in 1956. North Wantagh is an unincorporated hamlet in the Town of Hempstead with no post office of its own, so its homes carry either a Wantagh 11793 or a Seaford 11783 address, and its children attend Levittown schools.
92.8% of units are single-family detached houses and 4.1% are attached, and 95.1% of occupied homes are owner-occupied. Around the 1950s core sit smaller shares from other eras: 3.2% from before 1940, 9.2% from the 1940s, 7.3% from the 1960s, 5.2% from the 1980s and 2.8% from the 2000s.
A 1950s house on an oil burner is also the kind of house PSEG Long Island’s free assessment puts under a blower door, and that test is the clearest way to see where a North Wantagh house leaks before anyone decides how to insulate it.
The houses we insulate in North Wantagh
The hamlet is cut by three highways, the Southern State Parkway, the Wantagh Parkway and the Seaford–Oyster Bay Expressway, all with exits inside it, and Wantagh Avenue is its main commercial street. The Forest City section, with Forest City Community Park, sits near the line with North Bellmore. Between those roads the 1950s streets are lined with capes and ranches.
In a North Wantagh cape the upstairs is a set of rooms tucked under the roof, and only the gable-end walls are full height. Everything else is a boundary with the attic: short knee walls with a batt on the room side, sloped ceilings holding whatever fit against the roof deck, and a small flat ceiling at the top. The chimney usually climbs through one of the knee-wall spaces with an open gap around it, and the floor joists below the knee walls run out to the eave with nothing blocking them.
The ranch is simpler and wider. Its attic floor spans the whole house, the insulation laid on it has settled lowest where it was thinnest to begin with, near the eaves, and its ceiling is pierced by a hatch that is often a loose square of drywall, by the tops of every interior wall and by the fixtures of later remodels. Where the ranch has an attached garage, the wall and door between garage and house are a second weak point, for cold air and for fumes.
The 399 homes from the 1940s are smaller and plainer, often with an attic too shallow to walk in, and the 138 from before 1940 get a wiring check before any wall is filled. The 227 homes from the 1980s are a different generation: insulated walls, an attic built to that decade’s standard, and often central air with ducts running through the attic outside the insulation. The 178 attached units bring a party wall into the attic.
54.5% oil heat shapes both the payback and the precautions. The savings from sealing an oil-heated house show up as fewer deliveries in a winter, worth more when oil is expensive and less when it is cheap. National Grid gas lines run under many streets here, not all, so converting is possible on some blocks and not others. And a chimney-vented oil burner needs a draft check after the house is tightened, because a tighter house has less spare air for the flue.
What the blower door finds in a North Wantagh house
PSEG Long Island’s free Whole House Energy Assessment includes a blower door test, and its rebates require blower-door-assisted air sealing, so most North Wantagh owners who go after those rebates will see one. A calibrated fan is fitted into an exterior doorway on an airtight panel and pulls air out of the house until the inside sits 50 pascals below the outside. The airflow the fan needs to hold that pressure is the house’s total leakage, reported as air changes per hour at 50 pascals. New York’s code holds a new house to 3.0; an existing house has no required number.
The figure matters mainly as a before-and-after comparison. The real value comes while the fan runs, because every gap in the house is drawing air at once, and a hand, a puff of smoke or a thermal camera finds leaks that are invisible on a still day. A cold streak along a baseboard, air whistling at an outlet on an outside wall, a draft pouring from a recessed light or a closet under the eaves: each is a hole in the envelope showing itself.
In a 1950s North Wantagh house the fan tends to point to the same places. Overhead: the top plates of the partitions, the chimney gap, the hatch, the ceiling boxes and, in a cape, the open floor bays under the knee walls. Below: the rim joist and sill, the holes where the oil fill and vent lines and the water service pass through the foundation, and gaps around the basement windows. In between: the wall and door to an attached garage and any fireplace damper that no longer closes tight.
Sealing guided by the test is sealing that can be checked. The house is tested, the leaks are closed from the biggest down, and the house is tested again, so the result is a measured change rather than an impression. In a house with an oil burner, the last step is a look at how the burner and water heater vent with the exhaust fans running.
We seal before we insulate
Insulation resists heat creeping through plaster, drywall and wood; a gap lets air carry heat straight past it, and in a 1950s house the gaps usually matter more.
In a North Wantagh ranch the sequence is: from the attic, seal the partition tops, electrical boxes, plumbing vent and fixtures, close the chimney gap with sheet metal and high-temperature sealant, weatherstrip the hatch and give it an insulated cover, and set baffles at the eaves; in the basement, seal the rim joist, the sill and every pipe and line through the foundation; seal the wall and door to the garage. Test again, then insulate the attic to depth. A cape adds its knee walls, floor bays and slopes.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in North Wantagh
Most of our projects run between $3,500 and $12,500. Sealing and topping up a 1950s ranch attic, with baffles and the basement rim, is the lower end of the range; the knee walls, slopes and floor bays of a cape push it higher. A 1980s house with attic ducts adds duct sealing and insulation. Any service or venting work on the oil burner is a heating contractor’s job and separate from our price.
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 Wantagh
North Wantagh’s electric company is PSEG Long Island, whatever the mailing address says, and National Grid supplies its gas. NYSERDA’s Comfort Home program is not available to PSEG Long Island customers, so the rebate lane runs through PSEG Long Island.
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. The rebates are paid through its participating contractors after a free Whole House Energy Assessment, which checks insulation and drafts and includes a thermal scan and the blower door test. Single-family homes heated with oil, natural gas, propane or electricity are eligible, insulation must be installed with blower-door-assisted air sealing, and ductwork in unconditioned space must be sealed.
National Grid’s Long Island insulation rebate program is not taking new applications, and income-eligible households now go through NYSERDA’s EmPower+: air sealing and insulation at no cost up to $14,000 for a Nassau household of two earning at or below $79,163, or half the cost up to $7,000 for two earning below $105,550, through an EmPower+ contractor. Long Island households should check eligibility on the MyEnergy portal.
NYSERDA’s Green Jobs–Green New York program offers unsecured loans of $1,500 to $25,000 over 5, 10 or 15 years, either on the utility bill or as a regular monthly loan. They must be repaid, and PSEG Long Island electric customers apply for the on-bill version directly through PSEG Long Island. Each program pays through its own participating contractors, so confirm yours before you sign. 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. Our New York and New Jersey rebate guide has more.
Code and climate in North Wantagh
91.7% of North Wantagh’s housing was built before 1980. The hamlet’s 1950s streets were decades old before New York’s first statewide energy code took effect on 1 January 1979. Nassau County is Climate Zone 4.
Under the 2025 Energy Conservation Construction Code of New York State, in force since 31 December 2025, a new home needs R-49 ceilings, or R-38 over the full ceiling where it stays uncompressed and full height over the wall top plate 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 a blower door result no higher than 3.0 air changes per hour at 50 pascals.
Existing homes are treated differently. Unaltered parts of a house need not comply, and New York’s code does not require a blower door test when you insulate an existing home. Cavities exposed by a renovation are to be insulated to full depth. ENERGY STAR recommends R-60 for an uninsulated attic in this zone and R-49 for one with 3 to 4 inches already in it.
Common questions about insulation in North Wantagh
Do you install insulation in North Wantagh, NY?
Yes, across the hamlet, whether the house carries a Wantagh or a Seaford address, from the Forest City section to the streets along Wantagh Avenue. Most of our work here is the 1950s cape and ranch, 68.1% of the housing: attic floors, eaves, knee walls and slopes, hatches, chimney gaps and basement rims, with the oil burner’s draft checked after sealing. We also work on the 1940s houses with shallow attics, the 1980s houses with attic ducts, and attached homes.
How much does insulation cost in North Wantagh?
Most projects run $3,500 to $12,500. The ranch attic, its eaves and the basement rim make the smaller jobs; knee walls, slopes and the bays beneath them make a cape bigger. Ducts in a 1980s attic add their own sealing and insulation, and any work on the oil burner itself belongs to your heating contractor and is priced separately. The walk-through is free, and the scope and price come in writing.
Are there insulation rebates in North Wantagh?
Yes, through PSEG Long Island, the hamlet’s electric company. It 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 more for income-qualified homes, paid through its participating contractors after a free Whole House Energy Assessment that includes a blower door test. Oil-heated homes qualify. Comfort Home is not open to PSEG Long Island customers. Income-eligible households can check EmPower+ on the MyEnergy portal. The federal 25C credit ended for work placed in service after 31 December 2025, and New York has no state credit.
Our mail says Wantagh (or Seaford). Are we in North Wantagh, and does it change anything?
You may well be. North Wantagh has no post office, so every home in it has a Wantagh 11793 or Seaford 11783 address, and many people call their neighborhood Wantagh or Seaford. For insulation, the address changes nothing. The house sits in the Town of Hempstead, PSEG Long Island supplies its electricity, and the rebates follow the electric company, not the ZIP code. The house decides the scope: when it was built, what is overhead, and what burns in the basement.
Free energy audit in North Wantagh
We start with the leaks you can feel and then go looking for the ones you cannot: the attic floor, eaves, hatch and chimney gap overhead; the knee walls and slopes in a cape; the rim joist, sill and foundation penetrations below; the garage wall and door. We look at how the oil burner and water heater vent. If the attic insulation is adequate and the basement rim is where the air comes in, we say so. You get a written scope and 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 Wantagh
- Insulation in Seaford
- Insulation in North Bellmore
- What happens during an energy audit
- Air sealing
- Basement and rim joist insulation