Business Details
Emergency
services
Trusted Plumbing & HVAC Solutions Since 1895
W. L. Gary has been delivering expert mechanical solutions since 1895, combining over 125 years of industry experience with a commitment to innovation and client satisfaction. Our licensed Journeymen and Master Mechanics specialize in plumbing, HVAC, and mission-critical construction, serving commercial and industrial clients across Washington, D.C., Maryland, and Northern Virginia. We prioritize safety, efficiency, and sustainability through advanced technologies like hydro-jetting, VRV/VRF systems, and energy optimization services.Our 24/7 emergency response team ensures uninterrupted operations for critical facilities, while our maintenance agreements help clients reduce costs and extend equipment lifespans. Rooted in a culture of integrity and community support, we maintain certifications from leading industry organizations and hold a Certified Business Enterprise designation in D.C.
Services
Plumbing Service
HVAC Service
Hydro-Jetting
Backflow Prevention
VRF/VRV Service
Maintenance Agreements
Energy Services
Mission Critical Construction
Design Assist
Plan and Spec Coordination
Highlights and features
- We offer 125+ years of combined experience in mechanical contracting.
- Our team includes certified Journeymen and Master Mechanics.
- We provide 24/7 emergency service for critical systems.
- Our safety program includes weekly toolbox meetings and job site evaluations.
- We maintain partnerships with leading manufacturers like Daikin and Mitsubishi.
Associations and certifications
- MSCA Green Star Contractor
- Certified Business Enterprise (DC)
Services
Plumbing Service
Our licensed plumbers address emergencies and maintenance needs, from drain cleaning to system retrofits. We use video inspection and hydro-jetting tools to resolve blockages and prevent future issues. Clients benefit from 24/7 availability and free project estimates.
HVAC Service
We maintain and repair commercial HVAC systems, including chillers, boilers, and VRV/VRF units. Our technicians are factory-certified by Daikin and Mitsubishi to ensure optimal performance. Preventive maintenance reduces downtime and energy costs for building operators.
Hydro-Jetting
High-pressure water jetting removes debris and buildup from sewer lines more effectively than traditional cable machines. This non-invasive method restores flow capacity and extends pipe lifespan, with customized maintenance programs available for ongoing protection.
Backflow Prevention
Certified technicians test and maintain backflow preventers to protect potable water systems. Annual certifications and five-year rebuilds mitigate contamination risks while ensuring compliance with local regulations for commercial properties.
VRF/VRV Service
Specialized installation and maintenance for variable refrigerant flow systems. Our factory-trained team optimizes energy efficiency by enabling simultaneous heating and cooling in different zones, reducing overall consumption through shared refrigerant technology.
Questions
What areas do you service?
We serve Washington, D.C., Maryland, and Northern Virginia with 24/7 emergency coverage.
Are your technicians certified?
Yes, our team includes licensed Journeymen, Master Mechanics, and manufacturer-certified specialists.
Do you handle emergency repairs?
Yes, our 24/7 service team responds to HVAC and plumbing emergencies year-round.
What HVAC systems do you support?
We service all commercial systems including VRV/VRF, chillers, boilers, and mission-critical equipment.
How can I prevent plumbing issues?
Regular hydro-jetting and maintenance agreements help prevent blockages and extend system life.
