Let’s be real. Managing HVAC systems in a commercial or industrial building in Massachusetts isn’t for the faint of heart. From surprise breakdowns and rising energy bills to vendors who vanish when you need them most, it’s easy to feel like HVAC is where everything unravels.
At Harold Brothers Mechanical Contractors, we’ve worked with property managers, facility directors, and operations teams across New England to make sure HVAC is not the thing keeping them up at night. And while we’re proud to be one of the top mechanical contractors in the region, we also know: we’re not always the right fit for everyone.
That’s why we often get asked: “If not you guys, then who do you trust?”
So we made a list.
These are five commercial HVAC providers in Massachusetts that have earned our respect. They’re experienced, responsive, and serious about helping your building run the way it should—quietly and efficiently.
How We Chose These Providers
Before we get to the list, let’s talk about what we looked for, and what you should look for, too.
Commercial and industrial HVAC isn’t the same as residential service. You’re dealing with bigger systems, more variables, and usually, far more at stake when something goes wrong. That’s why we focused on providers who check these five boxes:
- Proven commercial/industrial HVAC experience: Not just saying they’ve done it—actually doing it, consistently, in buildings like yours.
- Responsive service and strong communication: You need someone who answers the phone, follows up, and speaks your language.
- Clear, transparent maintenance agreements: No vague terms or fine print. You should know exactly what’s included and what’s not.
- Emergency response that works when it matters: Nights, weekends, holidays—if a system fails, you can’t wait.
- A solid track record with facility and property teams: We asked around. These are companies others speak well of—and trust with their buildings.
This list is organized alphabetically, not ranked. And yes, we’ve included ourselves—because we genuinely believe we’ve earned a seat at the table.
1. Harold Brothers Mechanical Contractors
We’re a full-service mechanical contractor serving Massachusetts and beyond, specializing in HVAC, plumbing, and process piping. With in-house engineering and fabrication, we provide seamless project delivery and ongoing system care for healthcare facilities, manufacturing plants, institutions, and other complex environments.
Why We Stand Out
What sets us apart is our fully integrated approach. Construction, service, and maintenance are all under one roof, which means fewer handoffs, faster fixes, and more accountability. Our preventive maintenance programs are customized to fit each client’s needs, and our 24/7 emergency response is staffed by real technicians who know your system.
What our Customers are Saying
“Their professionalism, expertise, and ability to execute complex projects on time have made them our go-to contractor for years. Whether it’s a fast-paced renovation, emergency service need, or large-scale system upgrade, we know we can count on Harold Brothers to deliver consistent results with minimal disruption to our operations. They’re more than a contractor, they’re a true partner in keeping our facilities running smoothly.”
2. J.C. Cannistraro, LLC
Cannistraro is a well-established mechanical contractor providing HVAC, plumbing, and fire protection services across Massachusetts. They’re known for managing large-scale institutional and commercial projects, especially in healthcare, higher education, and government facilities.
Why They Stand Out
Cannistraro shines when it comes to coordination and scale. They use technology like BIM modeling, asset tracking, and prefabrication to bring clarity and precision to complex builds. Their service teams are equipped to manage large, multi-system environments with ease.
What Their Customers Are Saying
“Cannistraro has been an integral part of our facilities team, bringing strong communication, innovation, and reliability to every job.”
3. Muirfield Mechanical
Muirfield is a locally-owned HVAC company that serves both commercial and residential clients. They focus on delivering quality system design, installation, and preventive maintenance, with an emphasis on building lasting customer relationships.
Why They Stand Out
Muirfield’s strength is its personal touch. Their team takes the time to understand the unique needs of your facility and builds maintenance plans that match. You’re never just a number; they follow through, follow up, and show up.
What Their Customers Are Saying
“The people at Mulkern Mechanical are true professionals. They're very responsive and knowledgeable… On a raging blizzard, Joe drove from Mansfield to Chelsea to fix our boiler so our people would have heat. To me, that’s going above and beyond.”
4. Mulkern Mechanical
Mulkern Mechanical is a family-run HVAC contractor providing installation, emergency service, and preventive maintenance to commercial facilities throughout Eastern Massachusetts. They work with schools, co-ops, multi-use commercial buildings, and more.
Why They Stand Out
Mulkern is known for being hands-on and highly responsive. Their team doesn’t just fix problems; they explain them, and they always look for a practical solution that fits the budget. That kind of honesty earns repeat business.
What Their Customers Are Saying
“They always find solutions to HVAC issues while meeting our budget concerns… Mulkern is always there to help.”
5. Service Unlimited Inc.
SUI has been focused exclusively on commercial and industrial HVAC since 1981. They offer full-system evaluations, maintenance, energy optimization, and emergency service across multiple sectors, from manufacturing to education.
Why They Stand Out
Service Unlimited emphasizes data-driven system care. They’re not just fixing what’s broken, they’re monitoring, analyzing, and helping clients avoid problems before they start. Their proactive approach earns trust.
What Their Customers Are Saying
“SUI presented the facts clearly and made sure our needs were fully met. Thoughtful and professional throughout.”
Need Help Choosing the Right HVAC Maintenance Partner?
Think of your HVAC maintenance provider like your building’s primary care doctor. You want someone who knows your system inside and out, checks in regularly, and responds quickly when there’s an emergency. Most importantly, you need a partner who helps you stay ahead of costly problems before they become major disruptions.
Before you sign a maintenance agreement, ask:
- What’s included in the contract—just inspections, or full-service care?
- How fast is emergency response? Do they cover nights, weekends, and holidays?
- Are their technicians OSHA-compliant?
- How often will they be on-site? Will you get detailed reporting?
- Have they worked with buildings like yours?
Next Steps for Hiring a Commercial HVAC Contractor in Massachusetts
Still wondering who to trust with your commercial HVAC maintenance? Now that you've seen five providers who consistently deliver for facility managers across Massachusetts, you’ve got a solid shortlist to work from.
We know how stressful it is to manage HVAC in commercial buildings; emergencies never wait for business hours, and a failed system can cost more than just money. That’s why we put this list together: to help you avoid getting burned by the wrong partner.
Your next step? Before you sign any service agreement, make sure you understand why HVAC maintenance matters in the first place. Read this article: “Why Purchase HVAC Maintenance?”.This article breaks down the long-term value, ROI, and what to expect from a good program.
Harold Brothers has worked with operations teams across New England to keep complex HVAC systems running smoothly. Let’s put together a plan that works for your building, your team, and your bottom line.
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