15.6% of Cromwell’s 6,286 housing units are attached houses, 978 townhouses and duplex halves, and most of the rest went up in a single twenty-year rush. The 1970s built 23.2% of today’s stock and the 1980s 23.0%, 1,459 and 1,444 units, as highway building made Cromwell a crossing point for three major routes. By 1980 the town had 10,265 people, over three times its size of forty years before. The median unit dates from 1977.
57.8% of units are detached houses, and 80.3% of occupied homes are owner-occupied. Utility gas heats 38.9% of homes, fuel oil 32.3%, electricity 21.4% and bottled gas 6.4%. For the oil-heated houses, sealing and insulation pay back as fewer deliveries each winter, and Home Energy Solutions treats them the same as a gas-heated house. Most of our Cromwell work is houses and townhouses from 1970 to 1990, which lose heat through air leaks and thin attics rather than empty walls, plus 864 homes from before 1940.
The houses we insulate in Cromwell
Cromwell was the Upper Houses of Middletown until 1851, when the General Assembly made it a town of 1,259 people. It had been a river village of merchants and maritime trades that fell back on farming after the War of 1812, then revived with industry. The J & E Stevens Company, founded in 1843, grew into the largest maker of cast-iron toys in the county, and A.N. Pierson, begun in the early 1870s, became the largest commercial rose grower in the country. John Stevens’s 1853 house is now the home of the Historical Society, and the Middletown Upper Houses Historic District and the Main Street Historic District are on the National Register.
A house of that age usually has walls with nothing in them, balloon-framed in the later ones, and an attic insulated whenever someone got around to it. Irish, German and Italian immigrants who came for the new jobs found housing along the river on lower Main Street, in areas more prone to flooding. The riverfront often sees freshets as the seasons change, and serious floods came in March 1936, in 1955 with Hurricanes Connie and Diane, and in 1984. In a cellar near the river we keep fibrous insulation off the walls, use closed cell foam at the rim joist, and find the old high-water line before planning anything below the first floor.
Cromwell kept its rural character until the mid-20th century. The 1950s, the decade of capes and ranches, built 10.4% of today’s units. A cape leaks at the knee walls and the joist bays that run under its second-floor rooms to the eave; a ranch leaks through its ceiling into a long attic of settled insulation.
Then the highways. Interstate 91 has two Cromwell exits, Routes 3, 9 and 99 run through town, and Route 9, opened at the end of 1989, ties Cromwell to I-95 in Old Saybrook and I-84 in New Britain. The raised ranches, splits, colonials and contemporaries of the 1970s and 80s were insulated when built, which is why owners assume they are done. They are not. The bedroom over the garage usually runs cold because the garage ceiling was never sealed. The cantilevered second floor of a colonial is often open underneath. A contemporary’s cathedral ceiling holds batts with no room to vent. And a pull-down attic stair, recessed lights and an unsealed plumbing chase let the house’s warm air into the attic all winter.
Townhouses and the association’s attic
With 978 attached units, 416 in three- and four-unit buildings and 369 in buildings of five to nine, a large part of Cromwell lives in complexes. The first question for any townhouse is who owns what. In a condominium the roof, the attic and the siding are usually common elements, and work on them needs the association’s written approval, so read the declaration before calling any contractor. If you own your unit and its roof outright, the decision is yours, though the party wall still ties you to a neighbor.
The townhouse weak point is that party wall. In many buildings of the 1970s and 80s it stops at the top-floor ceiling or rises as open framing, so the attic runs as one space over several homes and air moves between units and up into it. The fix is to close the attic along the party-wall line, seal the top plates, lights, fans and attic access, and only then add insulation. A shared attic should be done for the whole building at once.
Some work is the owner’s alone: the ceiling of a tuck-under garage below a bedroom, the rim joist in a basement. The Smart-E Loan accepts a condominium only if it is individually metered, and Home Energy Solutions is written for homes of one to four units, so a townhouse in a larger building should ask the program which route applies.
We seal before we insulate
Heat leaves a house through its surfaces, which insulation slows, and through its gaps, which insulation barely touches. A 1980s Cromwell house went up with batts in the walls and fiberglass on the attic floor; its biggest losses now are air.
In a 1970s raised ranch or 1980s colonial the sequence runs: seal the pull-down stair or hatch, the top plates, the plumbing and flue chases, the wire holes and ceiling light boxes; dam the chimney with sheet metal; baffle the eaves so new insulation cannot block the soffit vents; seal the garage ceiling and the rim of the lower level; then blow the attic to depth.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Cromwell
Most of our projects run between $3,500 and $12,500. In a 1970s or 80s house the number moves with the attic area and what sits in it, an air handler and ductwork included, the garage ceiling under a bedroom, and the cantilevers. A townhouse is priced by the unit or by the building, depending on who controls the attic. A house from before 1940 adds walls to fill. What spray foam costs covers the foam side.
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 Cromwell
Cromwell buys electricity and natural gas from Eversource, and both accounts sit inside Energize Connecticut. Home Energy Solutions is open to customers of Eversource, United Illuminating, Connecticut Natural Gas and Southern Connecticut Gas, whatever fuel heats the house. It is aimed at homes of one to four units; a renter needs the landlord’s approval, and a home that had these services within the last six years is not eligible again yet.
A standard Home Energy Solutions visit has cost a $40 copay since 1 April 2026. An authorized contractor does health and safety tests, a blower-door test to pinpoint drafts and air leaks, a duct test where there is forced hot air or central air conditioning, and up to seven hours of air sealing at no cost, with a $10 hourly fee beyond that. The visit ends with a report of recommended upgrades, rebates and financing. It can all happen in one visit if no barriers are found, but the program may recommend two for a larger house or one built before 1985, which covers much of Cromwell. There may be a waiting list, and the program is subject to available funding.
The 2026 Energize CT insulation rebate pays up to $2.00 per square foot or 75 percent of the total cost, whichever is less, to a maximum of $10,000. It covers attic floors, floored-over attics, walls, basement and garage ceilings and rim joists. An attic floor qualifies if it holds R-19 or less and finishes at R-49 or greater, or R-38 where R-49 is not structurally practicable, which describes many 1970s and 80s attics. Foam on the underside of a roof deck is not on the list, so ask the program before counting on a rebate for it. The insulation must be recommended during a Home Energy Solutions visit, approved before installation, and installed by an approved contractor from the Energize CT Insulation Installers Network.
Income decides the tier. On Energize CT’s 2026–2027 figures for a household of four, $93,681 or less is Income Eligible, with a no-cost visit and up to 100 percent coverage of insulation costs; $93,682 to $124,908 is Enhanced Incentives, with a no-cost visit and up to $2.50 per square foot, a range that varies by zip code; $124,909 and above is the standard tier. If your income sits near a line, ask which tier you are in before paying a copay.
The rebate follows only network installers, so ask any installer who quotes, including us, whether they are in that network, and compare prices after any rebate before you decide. The Connecticut Green Bank’s Smart-E Loan finances insulation with no money down, up to $50,000, at 6.99% APR for 5, 7 or 10 years, 7.49% for 12 and 7.99% for 15 where the lender offers it, on an owner-occupied home of one to four units; it goes through the Green Bank’s participating contractors, so ask whether yours is one. There is no federal tax credit for insulation installed in 2026, because Section 25C ended for anything placed in service after 31 December 2025. Our Connecticut rebate guide has the details.
Code and climate in Cromwell
56.2% of Cromwell’s housing was built before 1980. The town is in climate zone 5A, as all of Connecticut is, and the 2022 Connecticut State Building Code applies to applications filed from 1 October 2022, adopting the 2021 IECC with state amendments.
A new house or addition gets R-60 in the ceiling, or R-49 where the full uncompressed depth reaches over the wall top plate at the eaves; wood-frame walls of R-30 cavity, R-20 cavity plus R-5 continuous, R-13 plus R-10 continuous or R-20 continuous; R-30 in floors; basement walls of R-15 continuous, R-19 cavity or R-13 plus R-5 continuous; and U-0.30 windows. It must also test at 3.0 air changes per hour at 50 pascals on the prescriptive path, and never worse than 5.0. Connecticut’s next code, based on the 2024 IECC, has been adopted in draft, but its effective date has been delayed.
Common questions about insulation in Cromwell
Do you install insulation in Cromwell, CT?
Yes. Most of our Cromwell work is the raised ranches, splits, colonials and contemporaries of the 1970s and 80s, the capes and ranches of the 1950s, and townhouses where the owner or the association says yes. We also insulate the older houses of the Upper Houses and lower Main Street. We do not take on single apartments in the larger complexes, where the envelope belongs to the building’s owner or association.
How much does insulation cost in Cromwell?
Most projects run $3,500 to $12,500. In a 1970s or 80s house the drivers are the attic area and anything in it, such as an air handler and ducts, the garage ceiling under a bedroom and the cantilevered overhangs. A townhouse is priced by the unit or by the building, depending on who controls the attic, and a pre-1940 house adds walls to fill. We walk the house at no charge and put the scope and price in writing.
Are there insulation rebates in Cromwell?
Yes. Cromwell is Eversource for electricity and gas, so Energize Connecticut’s Home Energy Solutions visit is available for a $40 copay on the standard tier, or at no cost for income-qualified households, whatever fuel heats the house. The 2026 insulation rebate pays up to $2.00 per square foot or 75 percent of cost, whichever is less, to $10,000, on work recommended at the visit, approved beforehand and installed by an Energize CT Insulation Installers Network contractor. There is no federal tax credit for insulation installed in 2026.
Our house near the river on lower Main Street has flooded before. Can the cellar be insulated?
Yes, with the right materials. Fiberglass batts between cellar joists or against foundation walls hold water after a flood and have to be torn out, so we avoid them. Closed cell foam at the rim joist and on the upper foundation wall sheds water and dries in place. If the cellar still takes water, the drainage comes first, and the first floor can be insulated from below with closed cell foam. Freshets and the floods of 1936, 1955 and 1984 are why we plan for water there.
Free estimate in Cromwell
Our free estimate is our own walk-through and has nothing to do with the Home Energy Solutions visit or rebate eligibility. In a 1970s or 80s house we go into the attic to check depth, the top plates, the light boxes and any ductwork, then look at the garage ceiling, the cantilevers and the rim. In a townhouse we find the party-wall line in the attic; near the river we start in the cellar. Then a written scope and price, at no charge.
Call 914-825-6824 from 8am to 8pm, seven days a week, or use the contact form. We are based in New Rochelle, NY, and every job is done by our 100-plus in-house crew, which never subcontracts.
Learn more
- Insulation contractors across Middlesex County
- Insulation contractors in Middletown
- Insulation contractors in Portland
- Garage insulation
- Attic insulation
- Basement insulation