JamesWu HVAC and plumbing

James Wu HVAC And Plumbing works out of Quincy, and the detail that keeps showing up across three dozen Google reviews is how much of the job runs through diagnosis rather than a straight replacement quote — old wiring sized for a smaller unit, a water heater vented the wrong way, mold hiding inside an AC unit. The company describes itself as owner-operated by James Wu, in business about 10 years, covering Quincy, Boston, North Quincy, Wollaston, Quincy Center, and Marina Bay for heating, cooling, and some plumbing work on the side. Google shows a flat 5.0 across 41 ratings, and the 34 written reviews collected since mid-2025 don't include a single negative one — 14 of them landed in just the past six months. Recent jobs tell a consistent story: a multi-zone Mitsubishi heat pump install turned up 15-year-old wiring undersized for the new units, which got rewired and disclosed to the customer only after the job was done; a chimney-vented water heater with a back-draft problem was swapped for a power-vented unit the same day new heat pumps went in, with the Mass Save rebate paperwork walked through on the spot; mold growing inside a set of AC units got cleared with a careful power-wash the homeowner had worried would make things worse. When a renter's 25-year-old furnace died, James showed up within hours of the call, diagnosed it that day, and had a replacement running within 24 hours. The one figure worth double-checking is tenure — the decade in business is the company's own claim, not confirmed by an outside source. Directory listings also don't agree with each other on the review count, showing 39 ratings in one place and 41 in another, so it's worth cross-checking against the live Google page before booking. Anyone with a heat pump conversion, an aging furnace, or a mini-split job between Quincy and Boston is the target customer here, and across nearly a year of reviews the pattern holds: James does the diagnosis and the install himself rather than routing the job through a separate sales team. Get a written scope and confirm current licensing before signing, as with any HVAC job of this size.