Verified record
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Harold Brothers Mechanical Contractors. 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
Harold Brothers Mechanical Contractors has run out of Weymouth since 2008, working commercial and institutional mechanical systems — HVAC, plumbing and process piping — across labs, hospitals, schools, stadiums and office buildings in Massachusetts, Rhode Island and New Hampshire. Its Massachusetts HVAC license is verified active with the state, and BBB rates it A+ (the company isn't BBB-accredited). The public review record here is thin — four reviews from 2021 to 2025 — and it's split. In a 2025 review, one customer described the company misdiagnosing an HVAC unit twice, quoting $10,000 for repairs based on a technician's mistaken read that the compressors had failed, then declining to honor a $1,000 discount buried in that quote once the diagnosis proved wrong. A separate 2025 review called the workers lazy and said they wasted time on the job. Against that, another 2025 review described technician Andrew and his helper Cory diagnosing a heating problem within an hour and following through on sourcing a hard-to-find part; an older 2021 review was briefly positive with no detail. Given the small sample here, it's worth asking directly about how a diagnosis and quote get documented before authorizing repair work, particularly for anything above a routine service call.
“It's a blast. Great people. Extreme professionals. Fun place to work. No one bothers you. Don't expect everyone to get it right the first time. There's many styles of work happening at Harold Brothers, which makes great mechanics.”
Andrew and his helper Cory performed an all-star service on my heating system. Andrew was extremely knowledgeable and knew exactly what was needed within an hour of being there. Unfortunately the part I needed wasn’t available and had to be ordered, but Harold Brothers did a great job at sourcing and receiving the part in a timely manner. 10/10, highly recommended.
*Harold brothers misdiagnosed my HVAC unit twice, costing me thousands. They buried a $1000 refund within a $10,000 quote, and then refused to honor the discount when their $10,000 quote turned out to be bogus (their technician mistakenly thought I had failing compressors)* Details below: Before reading this, please look at my other Google reviews and see that, as a small business owner myself, I’ve only ever left positive reviews to support other businesses. However, Harold Brothers’ conduct towards my business was so shockingly unprofessional that I feel compelled to share my experience so others can avoid wasting large sums of time and money as I did. During routine maintenance, when my HVAC had a cooling issue, their technician wrote in his post-visit summary that I had a breaker problem and even provided a written recommendation for an electrician. I then spent $1,000 on parts and labor to have an electrician come out. He very quickly confirmed the breaker was working perfectly and that the issue was with the HVAC unit itself. Harold Brothers returned and subsequently changed their diagnosis to “two failed compressors,” quoting me $10,500 to replace them. To their credit, they admitted their technician’s mistake and reduced the quote to $9,500 to offset the $1,000 I had wasted. For a small business owner like myself, this is an incredibly large sum of money… so I called other HVAC companies to get second opinions. Not only were the other quotes significantly cheaper, but two separate techs immediately expressed doubt that two Carrier compressors would fail at the exact same time. I ultimately decided to pay another $639 for an independent assessment with a different company. Within one visit, the tech called the Carrier support line and confirmed both compressors were operating normally. He quickly identified the real issue: a clogged air duct filled with dust that was blocking airflow and shutting the system down. I asked Harold Brothers to honor the refund they had already promised, but they refused. Their own technician even came back, confirmed the compressors were fine, and apologized — yet the company still refused to reimburse me the $1,000. In short: Harold Brothers admitted their mistake and tried to charge me nearly $10,000 for completely unnecessary work, and then refused to honor the very refund they had built into that inflated quote. For a company that publicly advertises “integrity” and “ethics,” it is hard to believe this is how they conduct business. Until they make things right, I can only recommend other HVAC companies.
Terrible workers who were lazy and wasted tons of time.
Great company and people
Specializes in
Also offers
Languages
Established 2.5 rating
Suggested a cheap fix over a full replacement4.8
Fixed an unrelated issue at no extra charge4.4
Same-day emergencies5.0
Arranged financing and permits for a compressor swap3.9
Old-building expertise3.8