Holmes Mechanical Contractors

Holmes Mechanical Contractors (HMC), is an independent family-owned and operated small business with more than 40 years of experience.  Based in Prince George’s County, HMC serves Maryland, Virginia and Washington, DC and specializes in the installation, repair, service and preventive maintenance of mechanical systems for commercial, industrial, residential and Federal, state and local government applications.  We are a Master HVAC firm with a fully trained staff of professionals with a broad range of technical,project and facilities management expertise.

When you need quality HVAC and mechanical contracting services, HMC is the company to call.  Our technicians are professionals, trained to deliver innovative solutions in most efficient and cost effective manner.

Customer Service


Is to provide innovative and professional HVAC and mechanical services to ensure a safe and healthy indoor air environment.




  • Indoor air quality assessments including installation of the Air Knight system
  • Boilers,chillers & steam heating equipment
  • Building operations and plans
  • Customized systems/software integration
  • Natural energy installations
  • Energy reduction & savings strategies
  • Equipment evaluation & inventory preparation
  • Preventive maintenance
  • Cooling Tower repair and maintenance

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