At General and Mechanical Services (GMS) of Maryland, we pride ourselves on the quality, passion and experience of our technicians and project managers. Our commitment to providing the best and most cost-effective solutions to our customers is what drives GMS Maryland to encourage individual and company growth through training and a team-centered working style.


At GMS We Value


Provide high quality, reliable service


Be responsive to our customers’ needs


Supply the highest quality products


Provide fair and honest pricing

Areas We Serve

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

Crete United

GMS is a Crete United company. As part of this nationwide network, we join an emerging leader in energy efficiency who is focused on making the places where we work, live, and play healthier. Together, we offer customers a multi-service solution to address needs across HVAC, plumbing, electrical, network cabling, security, access control, and building automation. Trust Crete United and GMS to make every community better and built-environment more sustainable.