David Heating & Cooling Inc

David Heating & Cooling has been running out of Merrimac for decades — the BBB lists it as A+ accredited since 2005, and the company itself dates back to 1987, now with about 10 employees under owner Stephen T. Allison. It's built around HVAC: heating, cooling, boilers, heat pumps and water heaters, with plumbing and gas work as well, covering Merrimac and neighboring towns along the Massachusetts–New Hampshire line. The clearest pattern in its reviews is repeat, multi-year trust rather than one-off jobs. One customer has called them back across three different homes over 25 years, using them to swap out old boiler and HVAC systems each time and describing the pricing as competitive — sometimes thousands less than alternatives. Another recent review credits a routine maintenance visit with catching a failing expansion tank before it burst. A third reviewer, a new homeowner, said the crew found and fixed issues during a maintenance check and returned the next day once a part came in. Worth checking before booking: the state registry lists its Massachusetts HVAC license as expired. BuildZoom's own profile is inconsistent on licensing too — it shows two Massachusetts licenses (sheet metal and plumbing) as active while the same page also flags no active license on file, so current status is worth confirming directly. Review volume elsewhere is thin — no reviews yet on Angi or BuildZoom — so this read leans on a small number of long-time customers rather than a broad sample. For anyone nearby with an aging boiler or heating system, or who wants a shop that sticks around for decades of maintenance rather than a single visit, this is the kind of contractor people keep calling back — just confirm current licensing before signing anything.