77.2% of Rocky Point’s occupied homes heat with fuel oil. Utility gas heats 12.5%, electricity 4.2%, bottled gas 2.3% and wood 2.2%, and Rocky Point has little utility gas service for an oil house to switch to. This is a hamlet of owner-occupied houses on the North Shore, in the Town of Brookhaven: 93.9% of its 5,359 units are detached and 93.2% of occupied homes are lived in by their owners.
What makes the housing unusual is how evenly it was built. 12.3% predates 1940, 12.4% is from the 1940s, 17.1% from the 1950s, 15.4% from the 1960s and 20.1% from the 1970s, with a median of 1965. No decade dominates, so a Rocky Point street can hold a pre-war house that has been added onto three times beside a 1970s raised ranch, and the two are different jobs. What they share is the fuel: nearly every heat loss here is bought by the gallon.
The houses we insulate in Rocky Point
The 1970s built 1,077 of today’s homes, more than any other decade. Most are raised ranches and ranches, with some colonials. A raised ranch loses heat at its long attic, where the loose-fill has settled thin and the top plates are open; at the rim joist, sitting on a foundation wall that stands bare above grade; and at the garage ceiling under a bedroom. Those three come before anything else.
The 1950s and 60s added 917 and 825 homes, mostly ranches and capes. The ranch fails overhead, with a shallow attic, bath fans exhausting into it and recessed lights punched through the ceiling. The cape fails at the knee walls, where the insulation faces the bedroom and the attic side is open, and at the floor joists under the knee wall, which run out to the eave and let cold air under the upstairs floor.
The 1980s and 90s colonials, 17.4% of the hamlet, have insulated walls, and blowing more into them rarely pays. Their losses are a rim joist nobody sealed, a pull-down stair with no cover, recessed lights and, where central air went in, ductwork running through a vented attic. Only 5.3% of Rocky Point has been built since 2000.
The 5,200-acre site where RCA ran Radio Central, sending transatlantic radio messages from 1921, is now part of Rocky Point Pine Barrens State Forest. On wooded lots we check that soffit vents are not clogged with needles and leaves before adding attic insulation that depends on them.
At 77.2% on oil, payback is a question of gallons. A house that leaks at the attic, the rim and the chimney chase burns oil to heat air that leaves, and sealing those gaps cuts deliveries in the house that leaks most. With little gas in the streets, most of these houses will stay on oil or move to a heat pump, and a tight envelope makes either one cheaper to run.
Houses from before 1950: the railroad years and the war decade
Rocky Point had its own Long Island Rail Road station from 1895 to 1938, east of Broadway between Prince Road and King Road, with trains east to Wading River and west to Port Jefferson and New York City; a replica holding a Veterans of Foreign Wars museum stands on the site. 660 of today’s homes were built before 1940, and 663 more in the 1940s.
Many are small frame houses that have grown. The original house usually has empty walls, an attic with little height, and a shallow cellar or crawl space under it. Then come the pieces added over the decades: a room on a slab, a porch closed in over piers, a dormer, a second-floor addition with its own roof. Each has its own attic or none, its own floor, and a seam where it meets the original wall. If your house began as a seasonal cottage, the floor and walls were built for summer and are usually the coldest parts of it.
We work these houses piece by piece. In the original house we check for knob-and-tube wiring first, because live knob-and-tube cannot be buried in insulation, and for balloon framing, where wall cavities run open from the cellar to the attic and need blocking at the top and bottom before they are filled. A room over a crawl space gets the crawl space closed and its walls insulated, or the floor sealed and insulated from below with an air barrier under the joists if it sits on open piers. A roof with no attic gets closed cell foam from inside when the ceiling is open, or from above when it is re-roofed. The seams between old and new get sealed.
Where a wood stove is in use, a tighter house can pull smoke back down the chimney when a bath fan runs, so we keep clearances and discuss an outside air supply.
We seal before we insulate
Insulation slows heat through a ceiling, a wall or a floor. It does not stop air, and in an oil house the air that leaks out has already been heated by oil.
In a pre-war Rocky Point house with additions, the sequence is: seal the original attic’s top plates, chimney chase and wiring holes, and block balloon-framed wall tops; then each addition’s attic or roof, and the seam where it meets the old house; then the cellar or crawl space, with the sill, rim and the openings where pipes and the oil line pass. Then insulate. In a 1970s raised ranch it is the attic bypasses, then the rim on the exposed foundation, then the garage ceiling.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Rocky Point
Most of our projects run between $3,500 and $12,500. A 1960s or 70s ranch with one attic and a basement usually sits in the lower half. A pre-1950 house with two or three additions costs more for its size, because each addition’s attic, floor and seam is a separate piece, and filling old walls waits on a wiring check. Crawl spaces that need closing and roofs with no attic that need closed cell foam push the number up.
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 Rocky Point
Rocky Point’s electric company is PSEG Long Island, and the hamlet has little utility gas service. With PSEG Long Island as the electric company, NYSERDA’s Comfort Home program is not available to Rocky Point homes.
The rebate that fits an oil house here is PSEG Long Island’s. It lists a $2,500 insulation rebate and a $1,000 air-sealing rebate for market-rate single-family homes, plus $500 for duct sealing, with higher amounts for income-qualified homes and homes in state-designated disadvantaged communities. Single-family homes with a primary heating fuel of oil are named as eligible, alongside gas, propane and electric. Rebates are paid through PSEG Long Island’s participating contractors after a free Whole House Energy Assessment with a thermal scan and a blower door test, and the insulation has to be installed with blower-door-assisted air sealing.
NYSERDA’s EmPower+ pays for air sealing and insulation for income-eligible owners and renters through an EmPower+ contractor: at no cost up to $14,000 for lower-income Suffolk households (at or below $98,925 for four) or half the cost up to $7,000 for moderate-income households (below $131,900 for four), with up to $1,600 more in HEAR funds. National Grid says the program opened to its Long Island gas customers’ one- to four-family homes on 1 November 2025, but neither National Grid nor PSEG Long Island says whether a home with no gas account qualifies, which is most of Rocky Point. Check eligibility on the MyEnergy portal.
For financing, NYSERDA’s Green Jobs–Green New York program offers unsecured loans of $1,500 to $25,000 over 5, 10 or 15 years, and PSEG Long Island customers apply for the on-bill version through PSEG Long Island.
Programs pay through their own participating contractors, so ask the installer whether they are on the list. 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. Our New York and New Jersey rebate guide covers the rest.
Code and climate in Rocky Point
77.3% of Rocky Point’s homes were built before 1980. New York’s first statewide energy code took effect on 1 January 1979, long after the railroad-era houses and their first additions were built. Suffolk County is Climate Zone 4.
For new homes, the 2025 Energy Conservation Construction Code of New York State has applied since 31 December 2025. It requires R-49 in ceilings, or R-38 over the whole ceiling where the uncompressed R-38 keeps full height over the wall top plate at the eaves; R-30 in floors; R-15 continuous, R-19, or R-13 plus R-5 continuous on basement and crawl space walls; windows at U-0.27; and no more than 3.0 air changes per hour at 50 pascals.
Existing homes are not held to that table. Unaltered parts need not comply, and New York’s code does not require a blower door test when you insulate an existing home. Where an alteration exposes wall or roof cavities, as when an old addition’s paneling comes off, the 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 Rocky Point
Do you install insulation in Rocky Point, NY?
Yes. In Rocky Point we insulate the 1970s raised ranches and ranches, the 1950s and 60s capes and ranches, and the 1980s and 90s colonials. We also take on the pre-1950 houses from the railroad years and the 1940s, working through the original house and each addition: attic, walls, crawl space or cellar, and the seams between them. Nearly all of this work is in oil-heated houses, and we plan it around the chimney.
How much does insulation cost in Rocky Point?
Most projects run $3,500 to $12,500. A 1960s or 70s ranch with a single attic and a basement is usually in the lower half. A pre-1950 house with additions costs more for its size, because each addition has its own attic, floor and seam, and old walls are filled only after a wiring check. Closing a crawl space or foaming a roof with no attic moves it up. We give a written scope and a price after a free walk-through.
Are there insulation rebates in Rocky Point?
Yes. Rocky Point 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. Oil-heated homes are named as eligible. Comfort Home is not available to PSEG Long Island customers. Income-eligible households should 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 insulation credit.
Our Rocky Point house heats with oil. How will we know whether the insulation cut our oil use?
Compare gallons against the weather, not against last year’s total. A mild winter burns less oil whatever you do. If you are on automatic delivery, your supplier already estimates how much oil your house burns per degree day; ask for that figure before the work and again after a full heating season. If you fill on call, divide each delivery by the degree days since the last one. Remember that a boiler making hot water burns oil in summer too, so subtract that baseline.
Free energy audit in Rocky Point
In an older house we go through the original attic and every addition’s attic or roof, look at the seams between them, check the wiring and framing in the walls, and get under the floors into the cellar or crawl space. In a 1970s raised ranch we start in the attic, then the rim joist on the exposed foundation and the garage ceiling. Where a wood stove is in use, we check its clearances and air supply. If one addition is where the heat goes, 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. Open 8am–8pm, seven days. We work out of New Rochelle, NY, a family-owned company since 2015 with a 100-plus in-house crew that never subcontracts.
Learn more
- Insulation contractors across Suffolk County
- Insulation in Miller Place
- Insulation in Wading River
- Insulation in Ridge
- Insulation for older homes
- Crawl space insulation
- Wall insulation