Harrison is three different sales on one page, and we would rather say so
than pretend it is one town with one kind of house. A fifth of it is two-family
buildings. A fifth went up in the 1950s. And 6.3% — 612 units — has
been built since 2020, by far the largest very-recent share in Westchester
County.
The houses we insulate in Harrison
The median Harrison home was built in 1962.
48.5% of the stock is detached, 57.5% counting attached houses,
and 60.5% is owner-occupied — both lower than the
villages next door, because 21.6% of Harrison housing sits in
two-family buildings. That is 2,094 units, the second-largest
two-family share in the county after Port Chester. The 1950s account for 20.5%,
pre-1940 for 20.2%, the 1960s for 14.6%. Purchase sits inside the town and has
its own page.
In the two-families the heat leaves in three places and none of them is the
attic. First the cellar ceiling: the boiler, the tank and the mains are down
there, the floor above them has nothing in it, and the cellar is ventilated by a
door that does not shut. Second the common wall, which usually stops at the
top-floor ceiling instead of carrying on to the roof deck, turning the wall
cavity into a shaft from cellar to attic. Third the floor cavity between the two
units, open at the perimeter to the rim joist, so outdoor air reaches the middle
of the building and comes out at the baseboards on both floors. Where one boiler
serves both households the owner buys all of it.
The 1950s ranches and splits are a familiar package: R-19 or less in the
attic, settled and wind-washed thin at the eaves; R-11 in the walls if anything
at all; an open masonry chimney chase running basement to roof; a garage ceiling
under a bedroom with nothing in it; and a rim joist never touched. None of it is
dramatic on its own. Together it is most of the loss, and the attic plane plus
the rim joist does the bulk of the work for a fraction of the full list.
Then the 612 units built since 2020, much of it multifamily near the downtown
rather than houses. Where it is a house the honest service is commissioning, not
insulation. What it has never had is a blower door and a duct tester. We run
both, seal what shows up, and if it is tight you get that in writing.
We seal before we insulate
Insulation slows heat moving through a surface. It does nothing about air
moving through a gap. Pack a leaky attic with cellulose and you have a leaky
attic with cellulose in it — the air still moves, it just moves through
something softer.
In a Harrison two-family the order matters more than usual. Close the top of
the common wall and the cellar ceiling perimeter first, or the cellulose you
blow into the attic sits on top of an open shaft. In a 1950s ranch it is the
chimney chase, the top plates and the garage ceiling. In a 2022 house it is the
pressurized duct system. Then we insulate.
If a quote gives you a depth and never mentions air sealing, it is half a
job.
What insulation costs in Harrison
Most of our projects run between $3,500 and $12,500. In
Harrison the number is driven by unit count and access more than floor area. A
two-family with a cellar ceiling, a common wall to close at the top and two
attic accesses is more labor than a single ranch of the same footprint. A ranch
attic with one chase and a garage ceiling sits near the bottom, and a
commissioning visit on a recent house lower still.
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 Harrison
Harrison has the lowest owner-occupancy of the sound-shore towns at 60.5%,
much of it two-family owners living in one unit and renting the other. If that
is you, ask NYSERDA how the program treats your building rather than assuming.
Harrison is Con Edison for gas and electricity, but Con
Edison’s residential Weather Ready program is not
accepting applications, and its own page points Westchester customers
to NYSERDA and promises news about 2027 incentives. The $4,000 Con Edison
weatherization figure still on their index pages is stale.
The live program is NYSERDA Comfort Home:
$2,500 to air seal and insulate the attic and rim joist,
$3,000 if wall and floor insulation is added,
$2,000 more toward ENERGY STAR windows afterwards. The
contractor has to be on NYSERDA’s Comfort Home list and the house has to meet
the conditions of the whole package. At or below 80% of area median income,
EmPower+ is the route: no cost up to $14,000
downstate, half the cost up to $7,000 at moderate incomes. See
the full New York rebate guide for the
mechanics.
The federal Section 25C tax credit ended for anything placed in service after
31 December 2025. There is no federal insulation credit on a
2026 job.
Code and climate in Harrison
Harrison is the one Westchester town where a real slice of the housing is
really new: 612 units since 2020. Everything else was framed before New York
asked for much at all, and even the 2020s houses predate the current code, the
2025 Energy Conservation Construction Code of New York State,
in force since 31 December 2025 and based on the 2024 IECC.
Westchester is climate zone 4.
It sets R-49 in the ceiling, R-30 in
wood-framed walls (or R-20 cavity plus R-5 continuous, R-13 plus R-10
continuous, or R-20 continuous), R-30 in floors, and R-15
continuous, R-19 cavity or R-13 plus R-5 continuous in basement and crawl space
walls. Anyone quoting R-60 is quoting Connecticut. None of it applies to
a house already standing. The code does not require an existing
building to be altered, only that an alteration not leave you with less R-value
than you started with. ENERGY STAR recommends R-60 for a
retrofit attic in this zone, which is guidance rather than law.
Common questions about insulation in Harrison
Do you install insulation in Harrison, NY?
Yes, and we quote three fairly different kinds of work here: two-family
buildings, which are 21.6% of Harrison housing; the 1950s and 1960s ranch and
split stock; and houses built in the last five years, where the useful job is
testing and duct sealing rather than insulation.
How much does insulation cost in Harrison?
Most projects run $3,500 to $12,500. A two-family costs more than a
single-family of the same size, because there are two attics, a cellar ceiling
and a common wall rather than one attic. A ranch attic with a chimney chase and
a garage ceiling sits near the bottom.
Are there insulation rebates in Harrison?
Yes, through NYSERDA. Harrison is Con Edison territory, and Con Edison’s own
weatherization program is not accepting applications, so Comfort Home is the
live one: $2,500 for air sealing plus attic and rim joist, $3,000 with walls and
floors. EmPower+ covers income-qualified households, and there is no federal tax
credit on a 2026 job.
We own a two-family in Harrison and pay the heat for both units. Where is
the money going?
Usually the cellar and the common wall, not the roof. An uninsulated cellar
ceiling over a boiler room that leaks to outside is a constant drain, and a
common wall stopping at the ceiling instead of the roof deck lets the building
act as one chimney. Those two, plus sealing the floor cavity at the rim, are the
first money we would spend.
Free energy audit in Harrison
We walk both attics if there are two, the cellar, the rim joist and the
common wall, and give you a written scope and a price. No charge, no obligation.
If the house is already tight and the boiler is the real problem, we will say
so.
Call 914-825-6824 or use the form on this page. Open
8am–8pm, seven days. We have insulated hundreds of homes across New York,
Connecticut and New Jersey with a 100-plus in-house crew.