Based in Annapolis MD, General & Mechanical Services (GMS) is a leading provider of mission- critical infrastructure solutions and services nationwide. Since 1998, GMS has provided its customers with a “one-stop-shop” for all of their mechanical infrastructure needs including the supply, installation, testing and maintenance of industrial HVAC, mechanical, electrical and plumbing solutions.

The professional & certified team at GMS is committed to providing the best and most cost-effective solutions to its customers.

Commercial HVAC Services

Commercial HVAC

Heating and air conditioning services to help boost productivity & efficiency and reduce costs

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Commercial Plumbing

Plumbing and piping expertise for your facility’s needs, no matter how big or small

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Indoor Air Quality

Combat indoor pathogens and allergens by installing HVAC UV Lighting or Ionization products that clean the air using your existing ventilation system.


Data Center Cooling

Assuring uptime with energy-efficient data center cooling and infrastructure solutions

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Commercial Refrigeration

Whether you're running a family-owned restaurant or a government research lab, no refrigeration repair, installation or replacement job is too small or too big for us.


Design Build Services

Your one-stop-shop to design, engineer, install, service and retrofit the systems you need.

Areas We Serve

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