HVAC in Cohasset, Massachusetts

Cohasset is in Eversource electric territory, so homeowners qualify for the full Mass Save rebate program. Whole-home heat pump installs have qualified for up to $10,000 back in recent rebate cycles when paired with the required home energy assessment, while ductless and partial systems land in the $2,500–$6,000 range.

The free Mass Save Home Energy Assessment is the first step for Eversource customers. It unlocks the larger heat pump rebates and covers insulation and air-sealing at 75% or more, which helps even Cohasset's larger homes cut load before sizing equipment. The 0% Mass Save HEAT Loan can finance up to $25,000 of qualifying equipment interest-free.

Massachusetts requires a permit for any HVAC system replacement, reviewed by the Cohasset building department. A heat pump retrofit needs a separate electrical permit for the condenser circuits, pulled by a licensed electrician. Coastal and harbor-front properties sit in flood zones and near coastal wetlands, so outdoor units may need elevation and can trigger conservation commission review under the Wetlands Protection Act. Exterior changes on homes in Cohasset's historic district may need additional review. Established contractors handle permits and address flood, salt-air, and historic siting at the visit.

Cohasset costs run toward the upper end of the South Shore, lifted by large homes, coastal logistics, and high-end finishes. A full whole-home heat pump retrofit runs roughly $22,000–$40,000 before rebates given home size; a single-zone ductless mini-split lands at $4,500–$8,000 installed; and a like-for-like gas or oil boiler swap runs $8,000–$15,000. Multi-zone systems for big homes, corrosion-resistant coastal equipment, and flood-elevated units all push costs higher.

Cohasset is an affluent South Shore coastal town in Norfolk County, about 8,300 residents across roughly 3,300 housing units, known for its rocky shoreline, historic village, and large older homes near Cohasset Harbor. The median home is around 66 years old, with a significant stock of grand 19th- and early-20th-century houses alongside mid-century and newer coastal properties.

That older, high-value stock shapes the HVAC work. Many large homes run oil or gas boilers with radiators and have patchy or no central air, making multi-zone ductless mini-splits and full heat pump retrofits common. Oceanfront salt air wears on outdoor equipment, so corrosion-resistant condensers and protected siting matter here.