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Reliable Mechanical Solutions for Your Commercial Building

Get the high-performance mechanical construction that your commercial project  needs to stay on budget and get completed on time. Serving Massachusetts, Rhode Island, and Southern New Hampshire.

Knowledge You Can Trust

Between the Harold Brothers Learning Center, which provides valuable knowledge and resources, and our commitment to educating you every step of the way, you will always feel informed and confident.

EMPOWERING YOUR NEXT STEP

Service You Can Always Rely On

Your commercial property's mechanical systems need exceptional service from installation to maintenance. Our cost-effective repairs prioritize your needs over replacements, ensuring efficiency and longevity. 

SUPPORT EVERY STEP OF THE WAY

Smart, Budget-Friendly Solutions

You deserve safe, reliable, and affordable plumbing and HVAC solutions. In order to stick to your budget we equip our team with the top tools and training so that they can get the job done efficiently and correctly. 

YOU STAY ON BUDGET

Hiring the Wrong Mechanical Contractor is a Costly Mistake That You Can't Afford

Selecting a mechanical contractor is a critical decision for your HVAC or plumbing project. Unfortunately, this also means making the wrong choice has costly consequences.

Hiring the wrong mechanical contractor can lead to:

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Blown Budgets

Putting your trust in the wrong company can cost you both time and money through poor planning and inefficient work. 

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Substandard Work

Companies that employ inexperienced or unlicensed technicians could put you at risk for not meeting state codes, and leave you with a broken system. 

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Broken Promises

The wrong company will ignore your service calls after signing you up for a maintenance contract. 

 

An HVAC technician in a Large Mechanical room with a clipboard in his hand

Harold Brothers: On-Time, On-Budget, and Built to Last

You need a reliable and experienced mechanical contractor who puts your needs first. Since 2008, we’ve been helping Massachusetts property owners and managers across all sectors—Laboratories, Stadiums, Hospitals, Schools, Office Buildings, Multi-Residential Buildings, and more—keep their mechanical systems running smoothly.  With clear communication and expert guidance, you’ll always know where your project stands.

When you need service, we’re always just a call away, providing top-quality work at a fair price. Your comfort, efficiency, and satisfaction are our priorities.

Our Clients

Here are a few examples of the companies that put their trust in Harold Brothers Mechanical.

How to Get Started with Harold Brothers

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Request a Quote

Reach out to us and let us know a little about your project. Are you looking for help with new construction, or service for your existing equipment? Give us a call and let us know.
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Meet with one of our Professionals

Once we understand your project, our team will contact you to assist with construction or service needs.
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Set Your Property Up for Long Term Success

Our team efficiently installs quality products and provides guidance on equipment use. With a Preventative Maintenance Contract, you can ensure ongoing success.
Request a Quote

Why Our Clients Trust Us

“We are grateful to be working with such a great HVAC company like Harold’s brothers who took this matter seriously and helped us in a timely manner. Tyler and Lisa are wonderful to work with.”  

Cory Murphy, Director Of Maintenance - The Cordwainer

“In my experience, Harold Brothers has proven to be an excellent mechanical contractor. The mechanics onsite worked safely and produced quality work. In closing, I am confident that given the opportunity, Harold Brothers Mechanical will be a valuable addition to any project team.”

 

Ryan Dessert, Project Manager -  Wise Construction

“Harold Brothers Mechanical Contractors is my trade partner of choice with both plumbing and HVAC scopes of work. Execution and delivery are always at a very high level. Their winning culture is driven down from both Patrick and John – The Best.”

 

Sean Edwards, VP Operations - Suffolk Construction

“As an owner I love when projects go smoothly and run on a tight, timely schedule – Harold Brothers goes above and beyond to make sure this happens. They have asserted themselves as an elite subcontractor in the mechanical industry – I always look forward to the next project with Harold Brothers.”

Andrew Maher, Owner - Anchor Line Partners

“I would like to commend Harold Brothers Mechanical Contractors, Inc. for an outstanding job on the New Nantucket Intermediate School. From man power to materials, the schedule was managed effectively throughout the project and as a result the project was delivered on time and within the budget. We look forward to working with the Harold Brothers team again in the near future.”

Robert Brait, Project Manager - Brait Builders Corp.

“We can depend on Harold Brothers Mechanical from start to finish. They are always a team player and have earned the reputation as a premier subcontractor from performance, safety and quality with Callahan Construction.”

Patrick Callahan, President - Callahan Construction Managers

“Harold Brothers has been a trusted partner for many years on projects both large and small. They have always been extremely responsive, professional, and team oriented which is why they are such a pleasure to work with which is rare to find. I look forward to doing business for many more years to come!”

Michael Fish, President & CEO - Dellbrook / JKS

Free Download

Get Preventative Maintenance Tips to Avoid Costly Repairs

If you aren't quite ready to purchase a Preventative Maintenance Contract for your equipment, maintaining your system is still extremely important.

Get our free download that will walk you through some of the steps our service technicians take when servicing equipment. We will provide you with some inside information on what to keep an eye on and how to avoid costly repairs. Fill out the form to get your free download.

Make the Right Choice the First Time

Choosing the right mechanical contractor can make all the difference between a seamless project and costly delays, budget overruns, or long-term maintenance issues.

With over 16 years of experience, we’ve helped clients complete projects on time and within budget while ensuring their HVAC and plumbing systems run efficiently. From expert installation to proactive maintenance, we’re here to help you avoid unexpected repairs and downtime—saving you time, money, and stress from the start.

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