JMH Mechanical LLC

JMH Mechanical is a South Shore HVAC company that keeps coming up in reviews for one thing: showing up fast when a system fails during a heat wave. One customer whose air conditioner quit on a 100-degree day got it running again on short notice; another called on July 3 during a heat wave and had the unit back up in a single visit. Beyond emergency repairs, the company handles full installs — a homeowner who got five estimates before choosing JMH described several conversations and texts with Jay and his crew, who answered questions and explained the process before installing a replacement furnace and AC system. All seven Google reviews from 2026 are five stars, and reviewers describe the work as clean, efficient, and finished without leaving a mess. One customer called it a family-run business. On its own site, JMH lists residential and commercial HVAC work — air conditioning, heating, heat pumps, radiant and geothermal systems, ventilation, sheet metal, and ductwork — serving towns from Brockton and Quincy down through Plymouth, Barnstable, and Hyannis, and says it offers free estimates. A solid call for both a broken AC during a heat wave and a full furnace-and-AC replacement — worth confirming your town falls within its stated South Shore, Greater Boston, and Cape & Islands service area before booking.