Business Details
Emergency
services
Trusted HVAC & Plumbing Solutions Since 1895
Since 1895, W. L. Gary has delivered innovative mechanical solutions to commercial and industrial clients across the DC metropolitan area. With over 125 years of combined experience, our team of certified Journeymen, Master Mechanics, and technical specialists provides 24/7 emergency response and proactive maintenance for HVAC, plumbing, and mission-critical systems. We hold licenses in DC, Maryland, and Virginia, maintaining rigorous safety standards through weekly toolbox meetings, job site evaluations, and mandatory protective equipment protocols. Our commitment to energy efficiency is demonstrated through advanced services like VRF/VRV system optimization and hydro-jetting pipe cleaning. As a Certified Business Enterprise in DC, we combine historical expertise with modern technology to extend equipment lifespans, reduce operational costs, and ensure client satisfaction.Our affiliations with Avetta, ISNet, and ConstructSecure verify our adherence to industry-leading quality benchmarks. We specialize in designing full-service mechanical systems from engineering through installation, with particular expertise in mission-critical environments requiring 24/7 technical staffing and data center monitoring. Our patented safety culture emphasizes open communication channels directly to management, ensuring rapid resolution of potential hazards. This combination of longevity, technical specialization, and community engagement has established us as regional leaders in mechanical contracting services.
Services
HVAC Service
Plumbing Service
Hydro-Jetting
Backflow Prevention
VRF/VRV Service
Mission Critical Construction
Design Assist
Maintenance Agreements
Energy Services
Emergency Repairs
Highlights and features
- 125+ years of continuous mechanical contracting experience in the DC Metro area
- 24/7 emergency service with rapid response for critical system failures
- Factory-certified technicians for major HVAC brands including Carrier and Daikin
- Energy-efficient solutions that reduce operational costs by optimizing system performance
- Comprehensive safety program with weekly training and mandatory compliance protocols
Associations and certifications
- MSCA Green Star Contractor
- Avetta
- ISNet
- ConstructSecure
Services
HVAC Service
Our HVAC service division maintains and repairs commercial heating, ventilation, and air conditioning systems across the DC Metro region. With factory-trained technicians certified for major brands like Carrier and Trane, we offer 24/7 emergency response and preventive maintenance programs. Our expertise extends to complex systems including computer room air conditioners, chilled water systems, and variable refrigerant flow installations.
Plumbing Service
We provide comprehensive plumbing solutions for commercial and industrial facilities throughout Washington, D.C., Maryland, and Northern Virginia. Our licensed plumbers specialize in emergency repairs, drain cleaning using hydro-jetting technology, and backflow prevention certification. With experience in both modern and historic infrastructure, we offer maintenance agreements to prevent unexpected system failures.
Hydro-Jetting
Our hydro-jetting service clears sewer lines and piping systems using high-pressure water streams up to 4,000 psi. This method effectively removes grease buildup, root intrusions, and mineral deposits from commercial plumbing systems. We utilize both large tow-behind units for main lines and compact systems for vertical stacks and difficult access points, followed by video inspection to verify clearance.
Backflow Prevention
We install, test, and certify backflow prevention devices to protect potable water systems from contamination. Our certified technicians perform annual inspections and mandatory five-year rebuilds for mechanical backflow preventers. We maintain client records and provide reminder notifications to ensure continuous compliance with local water safety regulations.
VRF/VRV Service
Our factory-certified technicians install and maintain energy-efficient VRF/VRV systems from Daikin, Mitsubishi, and LG. These advanced systems provide simultaneous heating and cooling to different zones while reducing energy consumption. We offer specialized service for heat recovery systems that transfer thermal energy between building areas, optimizing overall efficiency for commercial facilities.
Questions
What areas do you service?
We provide HVAC, plumbing, and mechanical services throughout Washington, D.C., Maryland, and Northern Virginia, including emergency response for critical systems.
Are you available for emergency repairs?
Yes, our 24/7 service team responds to HVAC and plumbing emergencies 365 days a year, with rapid dispatch for mission-critical environments.
Do you offer maintenance agreements?
We provide customized maintenance plans for HVAC systems, plumbing infrastructure, and VRF/VRV installations to prevent unexpected failures and extend equipment lifespan.
Are your technicians certified?
Our team includes licensed Journeymen, Master Mechanics, and factory-certified specialists for major HVAC brands, with mandatory safety training and continuing education.
How do you handle backflow prevention?
We install, test, and certify mechanical backflow preventers annually, with five-year rebuild services and compliance documentation to protect potable water systems.
Can you service VRF/VRV systems?
Yes, our technicians are factory-certified to service variable refrigerant flow systems from Daikin, Mitsubishi, and LG, including heat recovery and multi-zone configurations.
Reviews (5)
Jim Higgins
Feb 07, 2022
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In years of using plumbers both personally and professionally I've never encountered pricing policies as opaque as WL Gary's. They charged over $250 for the plumber to buy basic toilet repair parts. They charged for the plumber's time to generate an invoice even though it's automated. They charge for a full day's rental of a plumbing repair device that's stocked on the truck and was used for less than an hour.
The basic quality of the real plumbing work appears to have been good, and the plumber was pleasant to deal with, but he did have to return to fix a problem with that expensive toilet repair. All in, I can't recall having felt so gouged by a company's pricing and will never darken their doorstep again.
The basic quality of the real plumbing work appears to have been good, and the plumber was pleasant to deal with, but he did have to return to fix a problem with that expensive toilet repair. All in, I can't recall having felt so gouged by a company's pricing and will never darken their doorstep again.
Cam Healy
Oct 27, 2021
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Extremely fast plumbing - fixed toilet, shower drain, and sink water pressure in about half an hour. Had Dave as a technician. Quick and professional Service: Unclog drain
Sandy N.
Dec 12, 2020
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Our house lost the heat for few days and we finally got in touch with Angela, the service coordinator, she was very friendly, and no pain for 7:3am service appointment. Next morning 7:20, Andy already parked and be ready for the 7:30am service. Andy was very polite, knowledgeable and professional. We are very please with them and will recommend to everyone. Wish everyone have a warm and healthy holiday!
Barbara K.
Apr 22, 2020
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My laundry overflow pump failed and caused a water leak into the lobby of our building below. While they were prompt on the emergency call out they charged $1300+ for 20 minutes in the unit. They then charged OT rates for the plumber to sit in his truck for 4 hours waiting for a call back from a parts company. No attempts to manage OT. They were not transparent on pricing, rates, OT charges, number of techs to be sent or cost of parts.
Their staff also were out not working and charged hours - caught them walking back from God knows where on my dime. Also OT hours charges are not made clear in advance. Finally was yelled at my the tech. Get estimates in advance.
Their staff also were out not working and charged hours - caught them walking back from God knows where on my dime. Also OT hours charges are not made clear in advance. Finally was yelled at my the tech. Get estimates in advance.
Linda Escribano
Apr 08, 2020
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We have very old plumbing and use this company frequently. They are always knowledgeable, friendly, and very reasonably priced each and every time. We have had them come to deal with various issues over half dozen times in less than a year. Each time a different problem they easily solved. Their customer service is friendly and return calls quickly if you have to leave a message. Absolutely a solid five stars plus.
