Our Services
Commercial HVAC
Design, installation, repair, retrofit, and maintenance for commercial HVAC and mission-critical mechanical systems.
Commercial Plumbing
Commercial plumbing and piping solutions for facilities requiring reliable infrastructure and responsive service.
Data Center Power & Cooling
Energy-efficient data center cooling and supporting infrastructure designed to improve uptime, resiliency, and reliability.
Design Build & Infrastructure Solutions
One-stop design, engineering, installation, service, and retrofit solutions across HVAC, mechanical, electrical, plumbing, refrigeration, and indoor air quality.
About Us
General & Mechanical Services, LLC (GMS) is an Annapolis, Maryland-based provider of mission-critical HVAC, mechanical, plumbing, and electrical infrastructure solutions. Since 1998, GMS has served government, healthcare, education, and commercial facilities with design, installation, repair, retrofit, testing, and maintenance services for complex building systems. The company operates as a one-stop resource for commercial HVAC, commercial plumbing, indoor air quality, data center power and cooling, commercial refrigeration, and design-build services. GMS also supports public-sector customers as a GSA Schedule contractor and a GSA Building Maintenance and Operations provider, giving government agencies a streamlined path to procure commercial HVAC, mechanical, plumbing, and electrical services. Its project experience includes government facilities, healthcare systems, educational institutions, commercial properties, data centers, and other environments where system uptime and infrastructure reliability are critical. GMS serves Maryland, Virginia, Washington, D.C., Delaware, and Pennsylvania and provides 24/7 emergency support for commercial HVAC and plumbing needs.