David Heating & Cooling Inc

Three Google reviews is a thin public trail for a company that has pulled 237 building permits — and that gap is the most useful thing to know about David Heating & Cooling. The Merrimac shop has been at this since 1987 by the BBB's count, with about ten employees under owner Stephen T. Allison, and the permit record shows steady, ordinary work: 78 jobs in the past three years, mostly HVAC, at a typical permit value near $7,900. The handful of customers who did write describe the same kind of visit. A new homeowner's maintenance check turned up several system problems that were fixed on the spot, with one part ordered and installed the next day. Another had a boiler serviced after two skipped years, called the price reasonable, and credits the technician with catching an expansion tank leak that was close to bursting. The longest view comes from a customer of 25 years across three homes, who says they're the only ones trusted with heating and cooling and that the crews left the house cleaner than they found it. The licensing picture is what to sort out before signing anything. The Massachusetts registry shows the company's sheet-metal HVAC license as expired. Its own site advertises a Massachusetts master plumbing number and a New Hampshire licence number, neither of which was checked against a registry, and BuildZoom lists Massachusetts sheet metal and plumbing business licenses as active through May 2026 while simultaneously flagging no active license on file and scoring the company 0. The sources disagree, and only the registry settles it — ask for current license numbers and confirm them with the state before work starts. On the other side of the ledger, the BBB has accredited the company since 2005 and grades it A+. Its stated service area runs from Merrimac and Haverhill through Amesbury and Newburyport and up into the New Hampshire seacoast towns, and the work it advertises is the bread-and-butter list: boilers, furnaces, heat pumps, water heaters, gas piping and central air. For a straightforward boiler, furnace, water-heater or heat-pump replacement in the Merrimack Valley, the permit history says this is a shop that does this work constantly. Get the license status current in writing first, and don't expect a wall of online reviews to lean on.