Commercial HVAC Service

Commercial HVAC Contractors

For All Commercial Heating and Cooling Needs

M&M Welding and Fabricators are the trusted mechanical contractors and commercial HVAC contractors for all your commercial heating and cooling needs in Maryland, Virginia, and Washington, DC.


When the heating, ventilation, and air-conditioning system on your office, power plant, or business property starts to malfunction, you can feel the changes throughout the entire system, causing discomfort, a change in the air levels, and a risk to your power efficiency.


Commercial Heating and Cooling


Don’t let a malfunction in the HVAC cause disruption with your air filter system or allow it to destroy your heating and cooling comfort. Call upon us as the commercial HVAC repair team that can handle any large property repair, maintenance, or general service.


Our commercial ac repair and service technicians address the causes of these issues to prevent them from reoccurring. Our knowledgeable technicians are here for your commercial air conditioning repair and service needs. Since 1972 businesses have been calling on us, and we are always ready to deliver a satisfactory, on-time repair.

ASME & NBBPVI Certified

We are National Board and ASME Certificate Holders of “R”, “H”, “S”, “PP”, and “U” stamps

Boiler Services & Rentals

Boiler repairs, replacements, installation, re-tubes, and rentals are all available, ranging in size from 220,000 pounds per hour industrial steam boilers to 100 horse power apartment heating units

Preventative Maintenance

Preventative Maintenance Contracts are available for a variety of HVAC systems, including boilers, chillers, pumps, and cooling towers

Complete Retrofits

Let us retrofit your cooling tower, boiler, and more to keep your HVAC system updated and efficient

Commercial HVAC

With Decades of Commercial HVAC Expert Experience

From Washington, DC government facilities to public school systems in Maryland and Virginia, all varieties of businesses have trusted M&M Welding and Fabricators as their commercial HVAC Company.


Our reputation, proven desire for excellence, and friendly and knowledgeable customer service team uphold us to high standards that we then deliver to you in the form of high-quality commercial air conditioner repair and more.


The majority of employees at our HVAC company have been working with us for over ten years, some of them over three decades. Our employee’s commitment to us is because of our commitment to you.


We believe in a strong work ethic, a can-do attitude, and a willingness to always learn, expand, and grow our knowledge for the betterment of our communities.


Commercial HVAC Service

When you need to hire an outside commercial HVAC company to handle your internal maintenance, trust as the professionals who work to the highest standard you expect out of your own employees.


For 45 years we have approached every job with an attitude of “yes, we can” and we have learned every system we can and we approach every issue with a proven solution. Clients maintain a long-term relationship with us because we have always been there for them, from routine commercial HVAC service to 24/7 emergency repair jobs.


Off-hours don’t scare us away from tackling the big issues, so when you need someone you can trust, you can count on us.


Get in, get it done right, the first time, with M&M Welding and Fabricators’ commercial air conditioning service. No one works on boilers, chillers, and more as part of their commercial HVAC service like our team does.

Chiller installs
Piping and boiler equipment

HVAC Service

 A HVAC Company with Proven Results

An improper HVAC service that doesn’t result in a correct repair, installation, or maintenance can lead to owing more money and spending more time than your initial problem entailed.


Our professionals are driven by a strong work ethic to always give 110% at every job and to always make you, our client, satisfied with an excellent finished project.

Commercial HVAC service include:

Boiler repairs, replacements, installation, re-tubes, and rentals

Preventative Maintenance Contracts

HVAC Retrofits

Installation, repairs, and rentals of chillers and generators

Installation & Repair of underground steam system

Complete Steam and Hydronic Systems

And more!

 Commercial HVAC Service in Maryland

No Complex Commercial HVAC Repair is Beyond Our Reach

Commercial HVAC service require large equipment, and that is exactly what we supply. Don’t spend more money on hiring a company that then requires you to rent out the proper equipment. At M&M Welding and Fabricators, we own, maintain, and service our own large equipment for the large jobs.


We are not called the one-stop-shop in mechanical contracting for just any reason. People rely on us for their businesses because we understand what tools are needed, and we deliver with those expectations.

Just some of the many clients who we service include:

MD Transport
montgomery college
Washington County Public Schools
chiller replacements

HVAC Mechanical Contractors

A properly functioning HVAC will filter your air, rid the air of pollutants, and provide a cleaner, easier breathing space for you and your employees.


Don’t risk humid air or pollutants slipping through because of malfunctions or a delay in maintenance. There is peace of mind to be had in hiring M&M Welding and Fabricators, and it is because we don’t let you down.


Mechanical Contractors Near You


For all commercial heating and cooling needs, our HVAC Mechanical Contractors are available near you. Contact us to talk about maintenance or repairs. Our phones are being manned by friendly, knowledgable team members, or you can fill out our online contact form.


Commercial HVAC Companies


If you need 24/7 emergency work, we have the crew for that, too. That’s right — when other commercial HVAC companies are sleeping, we are up and tackling any major problems that come your way. It’s not just about good service, it is about going above and beyond.

Just a Few of Our Certifications


M&M Welding and Fabricators holds the following Certificates of Authorization from the American Society of Mechanical Engineers (ASME) and the National Board of Boiler and Pressure Vessel Inspectors (NBBPVI)

“R” Repair Stamp

“PP” Pressure Piping

“H” Heating Boilers

“S” Assembly of Power Boilers

“U” Pressure Vessels

Talk to Us Today to Discuss Our Commercial HVAC Services