The Mitsubishi Diamond Contractor your neighbors have been calling since 1989.

Single‑ and multi‑zone ductless systems engineered for New England winters using cold‑climate H2i® heat pumps. Manual J load calc, line‑set routing review, and commissioning. Mass Save® paperwork prepared by us; rebates landed in your name.

• Diamond tier warranty
• Mass Save® HEAT Loan eligible
• Cold‑climate to −13°F

Ducted central AC retrofits and new construction. We replace what should be replaced and repair what should be repaired; you get the math behind the recommendation, not a sales script.

• Manual J / Manual D sizing
• R‑454B refrigerant ready
• Duct sealing & static pressure

Gas, oil, and propane furnaces; cast‑iron and condensing boilers; indirect water heaters; zone valves and circulators. Seasonal commissioning and combustion analysis on every callback.

• AFUE optimization
• Combustion analysis on report
• Same‑day no‑heat dispatch

Service plumbing under our own master license: water heaters (tank & tankless), repipes, fixture replacement, gas piping, and boiler‑adjacent work that other HVAC shops sub out and we don’t.

• Master plumber PC‑4540
• Gas‑fitting licensed
• Tankless specialists

Custom transitions, plenums, and duct runs cut and brake‑formed at the Stanley Tucker Drive shop. Faster lead times on retrofits and a cleaner finish than off‑the‑shelf fittings.

• SMACNA‑referenced
• Custom plenums & transitions
• Galvanized & spiral

Twice‑a‑year tune‑ups, priority dispatch, and a discount on parts — designed so your equipment ages slowly and your callbacks stay rare. No surprise trip charges for plan members.

• Spring & fall visits
• Priority dispatch
• 15 % parts discount