60.8% of Medford’s occupied homes heat with fuel oil. Utility gas heats 26.1%, bottled gas 6.7% and electricity 4.4%, so in most Medford houses every leak is paid for by the gallon. Those houses are not especially old. The median home dates from 1975, and 41.7% of the 8,325 homes went up in the 1970s, with another 18.5% in the 1960s.
Medford is a hamlet in the Town of Brookhaven: 10.8 square miles of flat land crossed by the Long Island Expressway, Route 112, Horseblock Road and Patchogue-Yaphank Road. 79.6% of its homes are detached houses, 9.1% are townhouses and other attached single-family homes, and 90.4% of occupied homes are lived in by their owners. PSEG Long Island supplies the electricity. National Grid gas lines reach only parts of Medford, and many homes heat with oil, propane or electricity.
The houses we insulate in Medford
Medford started as a railroad stop. The Long Island Rail Road opened Medford station in 1843 in a flat stretch of the Central Pine Barrens, on the stage road between Patchogue and Port Jefferson, and in 1907 the railroad set up the Medford Prosperity Farm on 80 acres to prove that crops could be raised in the Pine Barrens. Theodore Roosevelt visited in 1910. Little housing from those decades is left: 417 homes, 5.0% of the stock, predate 1940, and the 1940s added only 0.8%. Those few get their framing and wiring checked before any wall is planned.
The suburb came later. Eagle Estates was built in 1963 along Horseblock Road east of Route 112, after being planned as far back as the 1930s, and the 1960s left 1,544 homes, mostly ranches and capes. A 1960s ranch has a long attic with a few inches of fiberglass batt or loose-fill, a bathroom fan that often blows straight into that attic, a soffit over the kitchen cabinets that is open to the attic from above, and a hallway hatch with nothing on its back. The cape has bedrooms under the roof, knee walls with no air barrier behind them and slopes too tight for a vent channel.
The Long Island Expressway came through in 1970, and the 1970s built 3,471 homes, more than any other decade. The Pines went up in those years east of Buffalo Avenue. A common house of that decade is the high ranch: a front door that opens onto a landing between floors, a garage and family room half below grade, bedrooms and kitchen above. It loses heat in four places. The rim joist around the lower level sits above ground for much of its length and was never insulated. The garage ceiling is the floor of a bedroom. The upper floor often overhangs the lower wall at the front, and that cantilever is open to outside air through its soffit. And the attic has thin batts, pulled back at every light and every wire.
17.3% of the stock dates from the 1980s and 90s and 11.7% has been built since 2000, including 369 homes in the 2010s. Their walls are insulated, so the work is overhead: cathedral ceilings, bonus rooms over garages and attic ductwork. The 757 townhouses and other attached homes and the 307 homes in three- and four-unit buildings raise a question first: who owns the roof and the attic. The 116 mobile homes, insulated in a belly under the floor, need their own plan.
Oil and propane houses: sealing without starving the burner
With 60.8% of homes on oil and 6.7% on bottled gas, the boiler room belongs on every Medford insulation plan. Most oil burners, and many older propane units, take their air from the room around them and send exhaust up a chimney by natural draft. In a leaky house the leaks keep that burner supplied. Tighten the house, run the dryer, a bath fan and the range hood at once, and the basement can be pulled slightly negative; a weak chimney can then stall and spill exhaust back into the room.
That is a reason to test, not to leave the house leaky. In a Medford house with a chimney-vented burner, the draft gets checked before the air sealing and again after it, and if the burner needs its own supply of outside air, the scope says so. A sealed-combustion boiler that pipes its air in and its exhaust out through the wall does not have this issue. Any house with a fuel-burning appliance should have working carbon monoxide alarms on every level, sealed or not.
The payback on an oil or propane house is counted in deliveries: fewer gallons every winter, worth whatever the gallon costs that year, so we show you where the house loses heat rather than promising a dollar figure. If a new burner or a heat pump is coming, do the envelope first. Heating equipment is sized to the heat a house loses, and a tighter house can take a smaller unit that runs longer and more evenly.
We seal before we insulate
Insulation slows heat moving through a ceiling or a wall. It does nothing about air moving through a hole, and warm air leaving through the top of a house pulls cold air in at the bottom. In a Medford high ranch, the bottom is the rim joist and the garage.
The sequence in that house: check the burner draft; seal the chimney chase at the attic floor with sheet metal and fire-rated sealant, never with insulation stuffed into the gap; seal the top plates, the plumbing stack, the wire holes, the recessed lights and the hatch; baffle the eaves; then blow the attic to depth. Downstairs, seal and insulate the rim joist around the lower level, seal the garage ceiling and the front cantilever before filling them, and weatherstrip the door from the garage into the house. Then check the draft again.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Medford
Most of our projects run between $3,500 and $12,500. A 1960s ranch with one open attic to seal and top up sits toward the low end. A high ranch costs more, because the rim joist around the lower level, the garage ceiling and the front overhang are each their own piece of work on top of the attic. A bonus room over the garage or a cathedral ceiling adds more. The foam portion of a job is broken down in our spray foam cost guide.
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 Medford
Medford’s electric company is PSEG Long Island, and its gas company is National Grid, whose lines reach only parts of the hamlet. With PSEG Long Island supplying the electricity, NYSERDA’s Comfort Home program is not open to Medford homes.
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, paid through its participating contractors after a free Whole House Energy Assessment. The assessment includes a check of insulation and drafts, a thermal scan and a blower door test. The rule that matters most in Medford: single-family homes heated with oil, natural gas, propane or electricity are all eligible. The insulation has to go in with blower-door-assisted air sealing, and ductwork in unconditioned space has to be duct sealed. A townhouse owner should confirm eligibility with PSEG Long Island first.
National Grid’s Long Island insulation rebate program is not taking new applications, and income-eligible households now go through EmPower+. If your household income is under Suffolk County’s limit, NYSERDA’s EmPower+ program can pay for air sealing and insulation at no cost up to $14,000 for lower-income households (at or below $98,925 for a household of four) or half the cost up to $7,000 for moderate-income households (below $131,900 for four), through an EmPower+ contractor. Federal HEAR money inside EmPower+ can add up to $1,600 for air sealing, insulation and ventilation, renters can apply, and Long Island households should check eligibility on the MyEnergy portal.
Each of these programs pays only through its own participating contractors, so confirm an installer’s standing with the program before you sign anything. 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 has the rest.
Code and climate in Medford
71.0% of Medford’s homes were built before 1980. New York’s first statewide energy code took effect on 1 January 1979, so the 1960s ranches and nearly all of the 1970s high ranches were built before the state set any energy standard. Suffolk County is Climate Zone 4.
The code in force today is the 2025 Energy Conservation Construction Code of New York State, effective 31 December 2025. A new house must reach R-49 at the ceiling, or R-38 over the whole ceiling where the uncompressed R-38 runs at 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; U-0.27 windows; and no more than 3.0 air changes per hour at 50 pascals.
A 1970s high ranch does not have to be brought up to that table. Unaltered parts of an existing house need not comply, and New York’s code does not require a blower door test when you insulate an existing home. If an alteration opens up wall or roof cavities, though, they must be insulated to full depth, so a lower level stripped to the studs gets its outside walls filled before the drywall goes back. 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 Medford
Do you install insulation in Medford, NY?
Yes. Most Medford work is the 1970s house, 41.7% of the hamlet, and the 1960s ranches and capes, 18.5%, along with the newer colonials, the townhouses where the owner controls the attic, and the few houses older than 1940. Homes heated by oil or propane are the usual case here, and the burner is part of the walk-through. We do not insulate the envelopes of larger apartment buildings. If you are unsure where your home fits, ask on the phone.
How much does insulation cost in Medford?
Most projects run $3,500 to $12,500. A 1960s ranch with a single open attic to seal and top up is usually near the low end. A high ranch runs higher because the lower-level rim joist, the garage ceiling under the bedrooms and the front overhang are separate work on top of the attic. A cathedral ceiling or a bonus room over the garage adds more. You get the scope and the price in writing after a free walk-through, before anything is scheduled.
Are there insulation rebates in Medford?
Yes. Medford 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, more for income-qualified homes, paid through its participating contractors after a free Whole House Energy Assessment. Oil- and propane-heated homes are eligible. Comfort Home is not available to PSEG Long Island homes. Income-eligible owners and renters can apply to EmPower+. The federal 25C credit ended for work placed in service after 31 December 2025, and New York has no state credit.
Our house heats with oil. Is it safe to seal it tight?
Yes, when the burner is checked as part of the job. A chimney-vented oil boiler draws its combustion air from inside the house, and sealing the leaks that used to feed it can weaken the draft when exhaust fans and the dryer run. So the draft is tested before and after the air sealing, and if the burner needs its own outside air supply, the scope includes it. Keep carbon monoxide alarms working on every level. With the burner accounted for, sealing an oil house is routine work.
Free energy audit in Medford
In a Medford house we start where the fuel burns: the boiler or furnace, the flue pipe, the chimney and how well it drafts. Then the attic, the chimney chase, the fan ducts and the eaves. In a high ranch we spend most of the time downstairs, at the rim joist, the garage ceiling and the front overhang. If the attic is in good shape and the heat is leaving through the lower level, 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 with a 100-plus in-house crew that never subcontracts.
Learn more
- Insulation contractors across Suffolk County
- Insulation in Holtsville
- Insulation in Farmingville
- Insulation in East Patchogue
- Air sealing, and why it comes first
- Basement and rim joist insulation
- What happens in an energy audit