Gary Truck in front of the White House


Licensed to work in DC, Maryland, and Virginia, W. L. Gary Company, Inc. is named as a Certified Business Enterprise in DC. Our licensed Journeymen and women and Master Mechanics are certified in a wide array of plumbing and HVAC specialties.

Licensed, Bonded, and Insured to perform work in

  • District of Columbia
  • Maryland
  • Virginia

Certified Business Enterprise (CBE)

W. L. Gary Company is a Certified “Longtime Resident Business Enterprise” (CBE) as named by the Department of Small and Local Business Development of the District of Columbia (DSLBD).

Master Mechanics and Licensed Journeymen

W. L. Gary Company employs master mechanics and licensed journeymen and women as well as licensed apprentices in the following specialties

  • Air-conditioning
  • Heating
  • Refrigeration
  • Plumbing
  • Gas fitting



W. L. Gary Company employs individuals certified in

  • ABB Drives
  • Backflow Prevention
  • CCTV inspections
  • Daikin shared refrigerant systems
  • Follet Ice Machines
  • Gas piping
  • Lateral Assessment and Certification Program (LACP)
  • LG shared refrigerant systems
  • Liebert Equipment
  • Manhole Assessment and Certification Program (MACP)
  • Medical Gas
  • Mitsubishi City Multi shared refrigerant systems
  • NASSCO’s Pipeline Assessment and Certification Program (PACP)
  • OSHA 500
  • OSHA 30
  • OSHA 10
  • Power Flame
  • Reznor equipment
  • Stulz
  • UA Star Certified
  • Viessmann Certified
  • Welding 


UA STAR technicians have successfully passed a rigorous exam that ensures technicians have the training and knowledge necessary to complete the complex tasks associated with servicing, repairing, maintaining or retrofitting a wide variety of mechanical systems. To become UA STAR certified, technicians complete a 5-year apprentice training program and have on-the-job work experience.  This means you are being served by a trained, accomplished technician that has skills to do his or her job correctly, safely and efficiently.
Many of W. L. Gary Company’s technicians are UA STAR certified.

Energy Saving Tip

Gary Company Cleaning Condenser Coils on Rooftop Unit

Condenser Coil Cleaning

A slight film of dust or dirt on the condenser coils or evaporator coils can decrease the efficiency of your HVAC unit by as much as 10%, increasing the cost to heat and cool your building.  Have the coils cleaned twice a year to keep the unit running more efficiently.

See more tips

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