About HMC

Holmes Mechanical Contractors, LLC (HMC)

About Us

HMC is an independent family-owned and operated small business with more than 40 years of experience. Based in Prince George 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;our team includes trained and certified technicians, facilities &operations professionals and project managers –all committed to achieving timely, quality results.

Ronald E.Holmes, CEO, has been in the HVAC business for more than 40 years, first working with his father in the family general contracting business, then with the US Navy aboard the U.S.S. Oriskansy. Shortly after leaving the Navy, Ron opened HMC. His commitment to service continued during a 38 year career as a Federal sector manager and leader. Upon his retirement from Federal service, Ron made a full-time commitment to the company.


Reach Us

Questions about our services or products, please call or send a message directly to us!

8900 Edgeworth Drive, Suite
Capitol Heights, MD 20743

Phone: 301.808.0707
Emergency: 240.486.2876
Fax: 301.808.0169


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