GMS: Making The Right Things Happen – Correctly and Promptly


General and Mechanical Services (GMS) of Maryland, is committed to using the most highly skilled technicians and providing them with the highest levels of training. As part of that commitment, GMS uses only Union labor and is an active member of a number of associations, including MCAA, who provide ongoing training and advice for members and their employees:

 The Mechanical Contractors Association of America, Inc. (MCAA)

The Mechanical Service Contractors of America, Inc. (MSCA)


The American Welding Society (AWS)

National Electrical Contractors Association (NECA)

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Hvac Tune-up*

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  • Keep your system efficient & lower energy bills
  • Reduce the need for costly repairs
  • Extend the life of your equipment

Sign up for a commercial maintenance agreement today to earn your free HVAC tune-up*

* includes one free AC unit tune-up per commercial customer. Additional units can be serviced as part of this offer - contact us for information

HVAC Venting - GMS Blog

GMS has created a Blog page - HVAC Venting where we hope to share thoughts and ideas with others in the industry or with those looking for answers to HVAC or mechanical infrastructure issues. Take a look and please feel free to share your thoughts and or comments with us. We'll also try and answer any questions you leave on HVAC Venting

New HVAC System Brings Peace & Quiet to School

GMS Awarded Contract for new GSA Contracting Vehicle - the Building Maintenance & Operations Strategic Sourcing






24 Hour Emergency Services

At GMS, we not only focus on long-term preventative care; we also handle emergencies. More »