Cohasset · Norfolk County
A cold house, a tired air conditioner, or a heat pump question in Cohasset? Tell us what's happening and get connected with an independent HVAC contractor who works in Cohasset.
Cohasset, Massachusetts
Cohasset's housing falls into two broad eras. Census estimates count 910 of the town's 3,244 housing units as built in 1939 or earlier, yet the median home dates to 1968. So one street can hold a radiator-heated house built before 1940 next to a postwar house with ductwork, and the right repair depends heavily on which one you own.
Before any of that: if a carbon monoxide alarm sounds or you smell gas, take everyone outside first. From the yard or a neighbor's house, call 911 or National Grid's gas emergency line. When the house is safe, or when the trouble is simply no heat or no cooling, a call or an online request puts you in touch with an independent heating and cooling contractor who serves Cohasset.
South Shore HVAC Finder only makes introductions. We don't employ technicians or perform repairs; we connect Cohasset homeowners with independent local businesses and lay out, with sources, the town details that shape heating and cooling work here.
Local knowledge
Four local facts that change how a heating or cooling job in Cohasset is planned.
Utilities
Cohasset gets electricity from National Grid's Massachusetts Electric company and natural gas from National Grid's Boston Gas. There's no municipal light plant here, so Mass Save is the rebate program to check for heat pumps and high-efficiency equipment.
Source: Mass.gov
Prewar Houses
Houses from that era usually began with a boiler, cast iron radiators, and little or no insulation in the walls. Before replacing equipment in one of them, ask the contractor to measure heat loss so the new system isn't sized for drafts that air sealing could fix.
Source: U.S. Census Bureau ACS
Coastal Flooding
A February 2025 memo from the Metropolitan Area Planning Council calls flooding a pressing hazard for Cohasset and notes the town has identified 166 coastal flooding pathways. Near the harbor and the cove, where a basement boiler or an outdoor condenser sits matters as much as which model you buy.
Online Permits
As of the town's Building and Inspections page in February 2026, permits were filed online and inspections were set up by contacting the department. The same Town Hall office covers building, electrical, plumbing, and gas inspections, so one office tracks most heating installs.
Source: Town of Cohasset (archived page)
Services
Independent contractors who work in Cohasset handle each job below. Every note ties the work to the town's houses, utilities, or shoreline.
Hire smart
Massachusetts has no single HVAC license. Gas work needs a gas fitter license, oil burner work a Department of Fire Services certificate, ductwork a sheet metal license, and larger refrigeration systems a refrigeration technician license. Most heating and cooling installs need a town permit.
Massachusetts has no single HVAC license. Gas fitters and sheet metal workers can be looked up on the state's occupational license search, and oil burner technicians hold a separate Department of Fire Services certificate with its own verification site. Source
Cohasset's Building and Inspections department at Town Hall, 41 Highland Avenue, handles building, electrical, plumbing, and gas inspections. Ask the contractor to file the permit online and to schedule the inspection with the department. Source
On a lot near the water, ask whether the outdoor unit can go on a raised stand or wall bracket and whether anything in the basement should move higher. A good answer considers your flood map, not only convenience.
Have the written estimate name the equipment, the permits, removal of the old system, and any Mass Save offer the contractor expects you to qualify for. Also settle whether you or the installer submits the Mass Save forms. Source
Costs
In Cohasset, the house itself drives much of the cost. Adding cooling to a plaster-walled prewar home takes more planning than swapping a condenser on a 1970s house that already has ducts, and an older boiler may need parts the technician has to order.
Location adds its own line items: raised pads, brackets, and corrosion-resistant coatings for equipment near the shore. Ask each contractor for a written estimate that separates equipment, labor, permits, and expected rebates, then compare the scope line by line rather than only the bottom number.
Neighborhoods and nearby
Contractors who serve Cohasset work from the village center and the harbor to Beechwood and North Cohasset. Route 3A links the town with Hingham and Scituate, and Route 228 crosses into Hull, so many of them cover those towns too.
Questions
Still not sure? Send a short request and a local pro can answer the specifics.
The age and layout of the house, whether ducts already exist, the fuel you're switching from or to, and how hard the equipment is to reach all matter. Permits and any flood-proofing add to the scope. Get written estimates from more than one Cohasset contractor and compare what each includes.
Timing in Cohasset hinges on the season's backlog, storm conditions, and whether the failed part is in stock. Calling links you with an independent HVAC business that works in Cohasset, and that business sets its own arrival window. If the CO alarm goes off or you smell gas, leave the house and call 911 first.
Building and Inspections at Town Hall covers building, electrical, plumbing, and gas inspections, and its page said in early 2026 that permits are filed online. Your contractor normally pulls the permit and arranges the inspection.
Cohasset has no municipal light plant. Electricity and gas both come from National Grid, a Mass Save sponsor, so Mass Save is the program to check. Offers change, so confirm the current terms with Mass Save or your contractor before you sign.
It's worth asking. The town has studied flooding around Cohasset Harbor and the cove, and outdoor units and basement boilers are the parts of a system most exposed to water. A contractor can suggest raised mounts or relocation, and FEMA's updated flood maps for the town, finalized in November 2016, show which zone your address is in.
Yes, usually without tearing out walls. Ductless mini-splits or small-duct high-velocity systems are common choices for houses without ductwork. Ask the contractor to look at the attic, the basement, and the wall space before recommending one.
Get connected
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