Delivering HVAC and Plumbing Solutions Since 1895
We bring more than 125 years of industry experience to each of our customers.
Build & Design
Providing Opportunities to our Partners
We are actively engaged in creating a culture in which people can be the best version of themselves
Build & Design
Giving Support to our Community
We are Active in the DC Metropolitan Area


Providing Solutions for Over 125 Years


We provide expert care and maintenance for a wide range of commercial HVAC equipment.


W. L. Gary understands the unique plumbing challenges and needs of your facility.


From engineering to full design build, our team specializes in designing and installing full service mechanical systems.


Safety requires constant vigilance. It's our top priority.
Excellence means constant improvement, day after day.
Communication is key, and our team keeps you informed.
Doing the right thing leads to lasting partnerships and relationships with our clients.
Building meaningful connections with our clients and partners is mission critical to our success.
Mechanical Solutions are often complex - but we always find a way to make it work.

Industry Leaders for 120 years

We’ve been providing innovative, lasting, and cutting-edge solutions to our clients for more than a century. Contact us today to learn how we can prolong the life of your equipment, save you money, and reduce your emergency mechanical spends.

24 Hour Emergency Service

HVAC emergencies happen in the middle of the night, and we're ready. Whether you're in charge of an operating room or an office building, contact us today to learn about the benefits of being a service contract customer.

Our Projects

More than a century of excellence and execution



1140 3rd Street, NE Suite 406 Washington, D.C. 20002

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