Cohasset · Furnaces
Cohasset furnace blowing cold, cycling, or getting old? Learn what to check, who inspects gas work at Town Hall, and how to reach an independent local HVAC contractor.
Cohasset, Massachusetts
In Cohasset, one Town Hall office sees a furnace job from permit to final sign-off. Building and Inspections at 41 Highland Avenue handles building, electrical, plumbing, and gas inspections and reviews plans for gas code compliance, so the contractor who replaces your furnace deals with a single department rather than several.
Most furnace complaints start smaller than a replacement, though. A clogged filter, a dirty flame sensor, a blocked condensate line, or a thermostat with weak batteries accounts for a lot of cold-air and short-cycling calls. Gas furnaces here burn fuel delivered by National Grid's Boston Gas, and oil furnaces bring their own set of parts and permits.
This page helps you separate the quick checks from the technician's work and plan a replacement if it comes to that. A call or online request connects you with an independent heating contractor who serves Cohasset.
If the blower runs but the air never warms up, the burner may be failing to light or shutting off early. A choked filter can also trip a high-limit switch.
Short cycling wears parts fast. Common causes include an oversized unit, a dirty flame sensor, or poor airflow through blocked returns.
Condensing furnaces make water as they run. A cracked trap or clogged drain line leaks onto the floor and can shut the furnace off.
A furnace that's losing efficiency burns more gas or oil for the same comfort. Compare this winter's bills with last year's to spot the trend.
Local knowledge
Who inspects the work, who owns the house, and where the furnace sits all matter here.
Gas Inspections
As archived in February 2026, the town's Building and Inspections page said the department handles gas, plumbing, and electrical inspections and reviews gas plans. Permits had moved to electronic filing, so ask your contractor for the permit record when the job is done.
Source: Town of Cohasset (archived page)
Owner-Occupied
Census estimates count 2,522 of 3,037 occupied units as owner-occupied. For most Cohasset households, there's no landlord or association to call when the furnace fails, so the maintenance schedule and replacement decision rest with you.
Source: U.S. Census Bureau ACS
Basement Flooding
The town used state coastal resilience money to assess flood risk around Jacob's Meadow, Cohasset Cove, and the James Brook watershed. A furnace sitting on a basement floor in a flood-prone spot can be ruined by a single storm surge, so a raised platform or a move upstairs is worth discussing.
Source: Town of Cohasset (archived page)
Right now
Safety comes first, then a few checks that sometimes solve the problem outright.
Don't investigate. Get everyone out, then call 911 or National Grid's gas emergency number from outside the house.
A filter gray with dust starves the furnace of air. Replacing it is a homeowner job and fixes more no-heat calls than people expect.
Make sure the thermostat is on heat with fresh batteries and the switch near the furnace is on. Leave burner and gas valve components alone.
Plastic intake and exhaust pipes on a side wall can be blocked by snow, ice, or leaves. Clear them gently if you can reach them safely.
What to expect
A technician typically watches a full heating cycle, then works through ignition, flame sensing, gas or oil pressure, the inducer and pressure switch, and blower operation. A combustion and carbon monoxide check around the furnace and flue belongs in any thorough visit.
For replacements, gas piping and appliance changes are inspected by Cohasset's Building and Inspections department. If an oil furnace is being swapped for gas, ask the contractor how the old tank will be removed and to check with the Cohasset Fire Department about any permit that step requires.
In older homes, expect the technician to look at the ductwork and return air as well. Undersized or leaky ducts can make a new furnace perform no better than the old one, and sealing them is often part of a good replacement quote.
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.
Gas furnace work requires a Massachusetts gas fitter license, searchable on the state's occupational license lookup. Oil furnace technicians need a Department of Fire Services certificate, which has a separate verification site.
Many older furnaces are oversized. Ask whether the new unit was sized from a heat loss calculation, not just matched to the old nameplate.
Switching to a high-efficiency furnace usually means new plastic vent pipes and a condensate drain. Ask where both will run and what that changes outside.
Have each contractor itemize the furnace model, ductwork changes, permit, removal of the old unit, and any Mass Save offer that applies.
Costs
Repairs range from a filter or sensor to an inducer motor, control board, or blower, and the price follows the part and the labor to reach it. A furnace jammed into a crawl space or a cramped basement corner takes longer to service.
Replacement cost depends on efficiency rating, venting changes, ductwork repairs, and whether you're converting fuels. In a flood-prone part of town, raising the unit adds to the job but may protect the investment. Ask for an itemized written estimate and whether Mass Save offers through National Grid apply to the model quoted.
More help in Cohasset
Every page below is written for Cohasset homes. Or start from the Cohasset hvac guide.
Questions
Still not sure? Send a short request and a local pro can answer the specifics.
Building and Inspections at Cohasset Town Hall handles gas inspections along with building, plumbing, and electrical work. Your contractor normally files the permit online and calls the department to arrange the inspection.
It depends on the repair and the furnace's condition. A sensor or igniter on an otherwise sound unit is usually worth fixing; a cracked heat exchanger or failed blower on an old, oversized furnace often tips the decision toward replacement. Ask the technician for both options in writing.
If your basement has taken on water before or your address sits in a mapped flood zone, ask a contractor about a raised platform or relocating the furnace. The town has studied flood risk around the cove and Jacob's Meadow, which shows how seriously local flooding is taken.
Cohasset's gas and electricity both come from National Grid, a Mass Save sponsor, so some high-efficiency equipment may qualify. Offers and eligibility change; check Mass Save or ask the contractor to confirm before you sign.
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