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Diamond Mechanical is a residential HVAC company based in Weymouth, Massachusetts, installing and servicing heating, cooling, and indoor-air-quality systems. Its website says it is owned and operated by technicians with decades of in-field experience, and offers free estimates. Google reviewers consistently credit a technician named Adi for clear communication, thorough explanations, and careful, code-compliant installations across dozens of jobs from 2024 through 2026. Customers describe full boiler and oil tank replacements, mini-split and heat-pump installations, furnace replacements, and emergency repairs on short notice, including weekend and holiday callouts; several reviewers say Adi walked them through diagnosis and options before recommending a fix rather than the most expensive one, and a 2024 reviewer said the job finished ahead of schedule at about half the price of four competing bids. In several recent reviews, customers say they now call Adi exclusively for both heating and cooling work and have referred him to friends and family. Diamond Mechanical is a strong fit for homeowners across the Weymouth area who want a communicative, detail-oriented HVAC company for installs, repairs, and emergency service, backed by a long, consistent run of specific, positive reviews from 2024 to 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from DIAMOND MECHANICAL. 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
“But fate intervened, and he ended up opening his own HVAC and refrigeration shop, Diamond Mechanical, four years ago.”
We have only had great experiences with Diamond Mechanical. Adi is extremely knowledgeable on all things HVAC and wonderful to work with!
Professional service, great communication and transparent pricing and quote for the service and parts used on the job.
After receiving several bids, I chose Adi at Diamond Mechanical to decommission my existing tankless hot water coil and procure and install a heat pump water heater for my domestic hot water system. His bid wasn't the lowest, but his communication was by far the clearest and most professional. That gave me confidence the job would be done right—and it was. Adi was responsive, straightforward, and easy to work with throughout the project. He answered my questions promptly, presented multiple options, and helped me choose the best solution for my system. I wasn't able to be on-site during the installation, but Adi coordinated directly with the electrician and documented the entire installation with detailed photos so I could independently verify the quality of the work. The installation was completed on schedule, and the workmanship was excellent. Shortly after the installation, an issue arose that initially appeared to be related to the new system. Adi responded quickly, helped troubleshoot the problem, and coordinated with a plumber. It ultimately turned out to be an issue with a different unit at the property, but his willingness to jump in and see it through demonstrated that he truly stands behind his work and cares about his customers. I highly recommend Adi and Diamond Mechanical. If you're looking for a contractor who communicates well, delivers exceptional workmanship, and follows through on their commitments, you won't be disappointed.
Adi is great, very thorough, very detailed, and walked me through everything going on with my system!
Diamond Mechanical was excellent to work with. Adi & his crew installed an HVAC Split system in our home. We had many questions along the way & Adi was very courteous, professional, and knowledgeable. We are very happy with the results & highly recommend Diamond Mechanical!
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2 changes recorded — last scanned Sep 17, 2026.
Honest diagnoses5.0
Same-day emergencies5.0
Fixed an unrelated issue at no extra charge4.4