Mechanical Contractors

A leader in designing, building and maintaining mission critical HVAC, mechanical, plumbing and electrical systems since 1998.

Since 1998, GMS has been recognized as a leading mechanical contractor in the Mid-Atlantic region. Based in Annapolis, MD, we provide design, repair, retrofit and maintenance services for properties in Maryland, Virginia, DC, Delaware and Pennsylvania. Education, healthcare, commercial and government facilities rely on us for their HVAC, mechanical, electrical and plumbing needs. The professional & certified team at GMS is committed to providing the best and most cost-effective mission-critical infrastructure solutions to its customers.

The professional & certified mechanical contractors at GMS are committed to providing the best and most cost-effective solutions to our customers.

Design Build Services

Mechanical Contractors Maryland

Work with GMS as your one-stop-shop to design, engineer, install, service and retrofit the systems you need.

Data Center Cooling

Data Center Solutions

GMS can help you plan, design and build your entire data center cooling and power solution that will position your business for future growth.

Latest from the Blog

Two skilled trade electricians

Beyond the Cubicle: Embracing the Rewards of Skilled Trade Careers

January 12, 2024

As the demand for skilled professionals continues to rise, now is an opportune time to consider the many benefits that come with embracing a career in the trades.

air duct in office having trouble

Troubleshooting Common Issues With Commercial HVAC Systems

September 5, 2023

Not sure what’s wrong with your HVAC? Troubleshoot the top 12 most common HVAC problems for commercial cooling systems and find the source of the problem.

rows of electric heat pumps

What Is Electrification, And What Does It Have To Do With HVAC?

June 5, 2023

Discover the importance of electrification, its relationship with HVAC systems, and how to install an energy-efficient HVAC system in your building.

Who We Serve

24/7 Emergency Services

Our experts are standing by to address your Commercial HVAC or Plumbing emergency.


Preventative Maintenance

Avoid costly repairs with preventative HVAC/Plumbing maintenance. Increase energy efficiency and extend the life of your equipment.

Areas We Serve

Helping Maryland, Virginia, DC, Delaware and Pennsylvania properties & facilities with their mission critical HVAC, mechanical, plumbing and electrical systems since 1998.