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One customer has been calling David Heating & Cooling for 25 years, through three different houses, and in an April 2026 review said they are still the only ones trusted with heating and cooling — polite, willing to answer questions, tidy on the way out. The company works out of Church Street in Merrimac and has been at it since 1987 by the BBB's count: 39 years, ten employees, with Stephen T. Allison listed as owner. The work is residential and commercial heating and cooling — furnaces, boilers, heat pumps and water heaters, installed, maintained and repaired — plus plumbing and natural gas installation. Its own site names a service area running from Merrimac, Haverhill, Amesbury and Newburyport up into the New Hampshire seacoast towns. The permit trail is the deepest thing about them: BuildZoom counts 237 permitted projects, 78 of them in the past three years, mostly HVAC, at a typical permit value near $7,949. The written accounts match that everyday-service shape. A May 2026 customer who had let two years of boiler service slide said the crew took care of it at what they called an extremely reasonable price and caught a leak in the expansion tank while they were there. Another May 2026 review, from a new homeowner, describes a maintenance check that turned up a few issues fixed on site, with one part ordered and a return visit the next day. On Google the company holds 5 stars from three ratings, and the BBB has kept it accredited since 2005 at an A+ grade. Licensing is the thing to pin down before booking. The state registry shows its Massachusetts HVAC licence, 640-SM-B, as expired. The company's own site lists a Massachusetts Master Plumbing licence, number 12976, and a New Hampshire licence, number 2210275 — ask for current copies of both and check them against the state register. For annual boiler and furnace service, a heat pump that needs looking at, or a water-heater swap around Merrimac and the seacoast, this is a long-established shop with free estimates offered through its Angi listing. Settle the licence question first, then get the scope and the price in writing.
David Heating & Cooling was great! As a new homeowner they were very helpful and answered all of our questions. During our maintenance check they found a few issues with the system and were able to fix them on site! One piece they needed to order and came back the next day to repair. Very pleased and will always be using in the future!
Worked with David Heating & Cooling this past year after forgetting to get annual service work done on my boiler the past 2 years. They came out and took care of business at an extremely reasonable price and also caught a leak in my Expansion Tank that was on the verge on bursting and costing me significant dollars. Everyone I dealt with was extremely helpful at the front desk to the technician that came out. Highly recommend
David’s heating and cooling is the BEST! I have been a customer for 25 years. I have lived in 3 locations and they are the only ones I trust to address heating and cooling issues. In each location they have been polite, willing to answer questions, and they left my home even cleaner than it was!!!! They have installed a boiler heating system, and 2 heating & cooling systems for me. In all 3 cases they replaced very old systems. Many of my neighbors have used them as well. There have been no complaints. And their prices were competitive, often thousands of dollars less! The estimate included great name brands. They also will maintain your systems with yearly maintenance checks.
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1 change recorded — last scanned Jul 29, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from David Heating & Cooling Inc. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$5,000 – $11,400
Typical HVAC project around $8,200
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