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Air Conditioning & Heat Pumps in Cohasset, MA

Salt air destroys ordinary outdoor units — and in Cohasset, from Sandy Beach to the harbor to the ocean-facing homes along Jerusalem Road and Atlantic Avenue, almost everything mechanical lives within reach of it. Cooling and heat pump work here is as much about equipment selection and placement as it is about tonnage.

What “coastal-rated” actually means

Standard condenser coils corrode fast in salt air; fins pit, capacity drops, and a unit that should last 15 years is done in 7. For ocean-exposed Cohasset homes we spec equipment with factory anti-corrosion coil treatments (Mitsubishi’s Blue Fin-style coatings and equivalents), stainless or coated hardware, and mounting that keeps the unit out of direct spray and off wet grade. Placement matters as much as the spec — the leeward side of the house buys years of life.

Ductless and central, sized for real Cohasset houses

Older Cohasset homes without ductwork get Mitsubishi ductless systems — multi-zone designs that respect the architecture, installed by a Diamond Contractor with the extended 12-year warranty. Ducted homes get central AC or a cold-climate heat pump, and for the many Cohasset homes on oil or propane, a whole-home heat pump paired with full Mass Save incentives is often the strongest replacement math in town.

What we handle in Cohasset

• Ductless mini-splits with coastal coil protection.
• Whole-home heat pumps — Mass Save HPIN-enrolled, rebates processed at signing.
• Central AC installation and AC repair on all brands.
• Coastal maintenance — coil rinses and inspections that matter double near the water.
• Indoor air quality and dehumidification for damp shoreline basements.

Cohasset questions we hear

How long will a condenser last near the ocean? Unprotected, sometimes half its rated life. Coastal-rated equipment, smart placement, and an annual freshwater coil rinse close most of that gap.

Does salt air void warranties? Some manufacturers restrict coverage on corrosion damage. It’s another reason we spec coated coils near the water — and register every warranty properly at install.

Can a heat pump handle this house as primary heat? Sized to a real load calculation at design temperature, yes — including the big ones. We show you the sizing math before you sign.

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Also in Cohasset: plumbing · heating · all Cohasset services

Cooling nearby: Hingham · Scituate · Norwell

3R Plumbing & Mechanical LLC · 77 Accord Park Drive, Suite D6, Norwell, MA · MA Master Plumber PL17071-M · Mitsubishi Diamond Contractor