Nearly three Farmingville homes in four heat with oil. Fuel oil warms 73.9% of the hamlet’s occupied homes; utility gas reaches only 16.1%, and electricity and bottled gas 3.9% each. Gas lines run through only parts of Farmingville, so for most owners the question is not whether to switch to gas but how much oil the house can stop burning.
The houses are the Long Island houses of the 1960s and 70s. Of Farmingville’s 5,183 homes, 1,191 were built in the 1960s and 1,468 in the 1970s, 51.3% together, and the median home dates from 1970. 91.8% of the stock is detached single-family houses and 85.1% of occupied homes are owner-occupied, so nearly every job here is one family deciding about one house.
Oil changes the arithmetic. Every hour the burner runs to replace heat lost through the attic floor or the band of framing between floors is paid for in gallons, so a house that loses less heat needs fewer deliveries. Sealing and insulating an oil house tends to pay back sooner than the same work on gas, and it keeps paying if the owners later move to a heat pump, which can then be smaller.
The houses we insulate in Farmingville
Farmingville grew late. The first settlement came in the late 18th century under the names Bald Hills and Mooney Ponds, on sandy hills that were never good farmland whatever the later name promised, and the hamlet had no post office of its own until 1950. The Keibel family worked a 72-acre fruit and vegetable farm here from 1950 until 1982, and Bald Hill, one of the highest points on Long Island, on the Ronkonkoma Moraine where the glacier stopped, carried a ski area from 1965 to 1980. Most of the hamlet’s houses came in those decades. Farmingville is a hamlet in the Town of Brookhaven, and the town’s seat.
The 1,468 homes of the 1970s and 1,191 of the 1960s are ranches, high ranches, splits and early colonials. They went up with thin fiberglass batts and no air sealing at all. Fifty years on, the attic batts have been crushed by storage, pulled back by electricians and thinned at the eaves. The top plates, the plumbing stacks, the chimney chase and the ceiling fixtures are open to the attic.
The 850 homes of the 1950s and 288 of the 1940s are smaller capes and ranches. A cape’s knee walls, the open joist bays behind them and the shallow flat attic above the upstairs rooms are where its heat goes; a small ranch loses it across the whole attic floor. The 535 homes of the 1980s and 336 of the 1990s were built after New York’s first energy code, with fuller walls, but their attic hatches, recessed lights and garage walls leak much as the older houses do.
The 194 homes from before 1940 include the Elijah Terry house of 1823, which stands beside the Bald Hill Schoolhouse of 1850. Houses that old are planned one at a time, starting from what the walls hold and how the house is wired. The 121 homes in buildings of fifty or more units are decisions for their owners and boards, and the 11 mobile homes are a different kind of job; call and we will say whether yours is one we can take on.
The high ranch: garage below, bedrooms above, and the band between them
The most common Long Island house of the 1960s and 70s is the high ranch: a front door at mid-landing, the kitchen, living room and bedrooms up a half flight, and a lower level set partly into the ground with the garage, a family room and the utility room where the oil burner often sits. It has four weak points we find in nearly every one.
The first is the band joist between the two floors. In a high ranch it sits above grade on all four sides, a long line of framing with nothing behind the siding but sheathing and air, and it leaks at every joist bay. Closed cell foam in each bay seals and insulates it in one step. The second is the garage ceiling, which is the floor of the rooms above. Its joist bays often connect to the rest of the house, the batts in them sag or are gone, and the garage air, fumes included, moves into the framing. We seal the bays at the house wall and fill the ceiling, with the garage-side surface closed.
The third is the lower-level family room. Its walls are concrete block below grade and short frame walls above, usually finished with paneling over little or nothing, and it is the coldest room in the house. Those walls get sealed and insulated from inside. The fourth is the stairwell at the front door, a tall wall spanning both levels that is often thinly insulated and open to the attic above. Above all of it sits a long, low attic under trusses, where the eaves are the hardest place to get full depth, so the baffles go in before the blowing starts.
We seal before we insulate
Insulation slows heat moving through a surface. Air moving through a gap carries heat straight past it, and in a hamlet where 73.9% of homes burn oil, that air was heated at the price of a delivery.
In a Farmingville high ranch the order is: seal the attic floor at the top plates, the plumbing stacks, the chimney chase with metal and fire-rated sealant, the bath fans and the ceiling fixtures, then box and weatherstrip the hatch. Baffle every eave. Blow the attic floor to full depth. Downstairs, foam the band joist, seal the garage ceiling bays where they meet the house, fill the garage ceiling, and then seal and insulate the family room walls. Before we close up the utility room we confirm the oil burner still has the combustion air it needs.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Farmingville
Most of our projects run between $3,500 and $12,500. An attic-only job on a 1960s ranch sits near the bottom of that range. A full high ranch job, meaning the attic, the band joist all the way around, the garage ceiling and the lower-level walls, costs more, and the garage ceiling and family room walls are the parts that move the number most. A cape costs more than a ranch of the same size because of its knee walls and slopes.
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 Farmingville
Farmingville is served by PSEG Long Island for electricity. Gas service from National Grid reaches only parts of the hamlet, and many homes heat with oil, propane or electricity instead. Because PSEG Long Island is the electric company, Farmingville homes are not eligible for NYSERDA’s Comfort Home program; the incentives come from PSEG Long Island.
PSEG Long Island’s program names oil-heated single-family homes as eligible, along with gas, propane and electric. It starts with a free Whole House Energy Assessment that includes a thermal scan and a blower door test, and 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. Band joist, basement and crawl space insulation count along with attic, wall and floor, which suits a high ranch. The insulation must be installed with comprehensive, blower-door-assisted air sealing, and the rebates are paid only through PSEG Long Island’s participating contractors, so ask the installer before work starts.
National Grid’s Long Island insulation rebate program is not accepting new applications. NYSERDA’s EmPower+ covers income-eligible owners and renters: at no cost up to $14,000 for lower-income households (at or below $98,925 for a Suffolk household of four) or half the cost up to $7,000 for moderate-income households (below $131,900 for four), through an EmPower+ contractor. National Grid says EmPower+ opened to its Long Island gas customers’ homes on 1 November 2025, but neither utility says whether an oil-heated home with no gas account qualifies, so check eligibility on the MyEnergy portal.
NYSERDA’s Green Jobs–Green New York program lends $1,500 to $25,000, unsecured, over 5, 10 or 15 years, and PSEG Long Island customers apply for the on-bill loan directly through PSEG Long Island. The federal Section 25C credit 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. See our New York and New Jersey rebate guide for each program in full.
Code and climate in Farmingville
77.0% of Farmingville’s homes were built before 1980. New York’s first statewide energy code took effect on 1 January 1979, so the hamlet’s 1960s and 70s high ranches were built before any state energy rules applied. Suffolk County is Climate Zone 4.
Since 31 December 2025, new homes in New York have been built to the 2025 Energy Conservation Construction Code of New York State. It sets ceilings at R-49, accepting R-38 across the entire ceiling where that R-38 runs at full, uncompressed height over the wall top plate at the eaves. Floors are R-30. Basement and crawl space walls are R-15 continuous, R-19, or R-13 plus R-5 continuous. Windows are U-0.27, and air leakage may not exceed 3.0 air changes per hour at 50 pascals.
Existing houses are not pulled up 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 the paneling comes off a family room wall, those cavities must be insulated to full depth. ENERGY STAR recommends R-60 for an attic with no insulation in this zone, and R-49 for an attic that already has 3 to 4 inches.
Common questions about insulation in Farmingville
Do you install insulation in Farmingville, NY?
Yes, throughout Farmingville and the neighboring hamlets of the Town of Brookhaven. Most of our Farmingville work is the 1960s and 70s house, 51.3% of the hamlet: high ranches with a bare band joist, a garage ceiling under the bedrooms and a cold lower-level family room, along with ranches, splits and colonials whose attic batts have thinned. We also insulate the 1950s capes and the houses of the 1980s and 90s. Large apartment buildings are for their owners and boards to decide.
How much does insulation cost in Farmingville?
Most projects run $3,500 to $12,500. An attic on a 1960s ranch is near the low end. A complete high ranch job, with the attic, the band joist all the way around, the garage ceiling and the family room walls, runs higher, and the garage ceiling and lower-level walls move the price most. A cape costs more than a ranch of the same size because of its knee walls. After a free walk-through you get a written price, and a big job can be split into stages.
Are there insulation rebates in Farmingville?
Yes. Farmingville 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 eligible. Comfort Home is not available here. Income-eligible households can check EmPower+ on the MyEnergy portal, and Green Jobs–Green New York loans are available. The federal 25C credit has ended, and New York has no state insulation credit.
Our Farmingville house has a whole-house fan in the hallway ceiling. Should we keep it?
It depends on whether you use it. A whole-house fan is a large opening from the hallway into the attic, closed in winter only by thin louvers, and warm air leaks through it all season. If you run it on summer evenings, keep it, but cover it from the attic side with a sealed, insulated box each fall and make sure the attic has enough vent area to let the air out. If it has not run in years, we can remove it, frame and close the ceiling, and insulate over it like the rest of the attic.
Free energy audit in Farmingville
In a Farmingville high ranch we start downstairs: the band joist from inside the garage and the utility room, the garage ceiling, the family room walls and the oil burner. Then the stairwell wall, and then the attic floor, the eaves and any whole-house fan or open chase. In a cape we go behind the knee walls. If the attic is fine and the loss is the band joist and the garage ceiling, we tell you that. The written scope and price cost nothing, and there is 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 Suffolk County
- Insulation in Selden
- Insulation in Holtsville
- Insulation in Medford
- Garage insulation
- Basement insulation
- Attic insulation