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 team of certified professionals specializes in HVAC and plumbing services, offering tailored solutions for commercial and industrial clients across the Washington, D.C. metropolitan area. We prioritize safety, reliability, and efficiency, ensuring systems operate at peak performance while minimizing downtime and costs. Our long-standing reputation is built on integrity, technical excellence, and a dedication to community partnerships. With 24/7 emergency response capabilities and advanced tools like hydro-jetting and video inspection, we address challenges promptly and effectively.Our affiliations with leading manufacturers and adherence to rigorous safety protocols underscore our commitment to quality. By fostering a culture of continuous improvement and employee development, we maintain the expertise needed to serve diverse client needs. From maintenance agreements to mission-critical installations, we deliver value-driven solutions that extend equipment life and reduce operational expenses. Our core valuesdoing the right thing, pursuing excellence, and open communicationguide every project we undertake.
Services
Plumbing Service
HVAC Service
VRF/VRV Service
Backflow Prevention
Construction Design
Highlights and features
- 125+ years of mechanical contracting experience in the DC Metro area
- 24/7 emergency service with rapid response capabilities
- Factory-certified technicians for major HVAC equipment brands
- Energy-efficient solutions that reduce operational costs
- Comprehensive safety program with weekly job site evaluations
Associations and certifications
- MSCA Green Star Contractor
- Avetta
- IsNET
- ConstructSecure
What people say
24/7 emergency response
Certified technicians
Energy-efficient upgrades
Prompt repairs
Long-term reliability
Services
Plumbing Service
Our plumbing services address commercial and industrial needs with 24/7 emergency response capabilities. We specialize in hydro-jetting, video inspections, and backflow prevention to maintain system integrity. Certified technicians handle repairs, installations, and preventive maintenance for facilities of all sizes.
HVAC Service
We provide comprehensive HVAC maintenance and repair services for commercial buildings. Our factory-certified technicians service equipment from Carrier, Trane, Daikin, and other major brands. Solutions include indoor air quality improvements, refrigerant conversions, and mission-critical system support.
VRF/VRV Service
Specialized installation and maintenance of Variable Refrigerant Flow systems from Daikin, Mitsubishi, and LG. These energy-efficient systems provide simultaneous heating and cooling capabilities while reducing overall energy consumption through shared refrigerant technology.
Backflow Prevention
Certified backflow testing and certification services ensure safe water systems. We install and maintain mechanical preventers, perform annual testing, and offer maintenance contracts to meet regulatory requirements and prevent contamination risks.
Construction Design
Full-service mechanical system design and installation from engineering to completion. Our team handles projects of all scales, specializing in integrating HVAC and plumbing systems for optimal performance in new constructions and major renovations.
People
Mahlet Zewde
Billing Coordinator
23-year veteran of W. L. Gary with expertise in financial operations and client billing processes. Recognized for dedication and service excellence through the Buddy Greer Award.
Ralph Seek
Senior Technician
30-year company veteran specializing in complex HVAC system maintenance. Recipient of the William C. Buddy Greer Dedicated Service Award for exceptional technical contributions and mentorship.
Questions
What areas do you service?
We serve Washington, D.C., Maryland, and Northern Virginia with 24/7 emergency coverage across the metro area.
Are your technicians certified?
Yes, our team includes licensed Journeymen, Master Mechanics, and factory-certified specialists for major HVAC equipment brands.
Do you offer emergency services?
We provide 24/7 emergency response for plumbing and HVAC issues with rapid dispatch to minimize facility downtime.
What HVAC systems do you support?
We service all major commercial HVAC equipment including VRF/VRV systems, chillers, boilers, and mission-critical climate control solutions.
How can I schedule service?
Call 202-723-0676 anytime for emergency service or use our online request form for scheduled maintenance and inspections.
Do you offer maintenance agreements?
Yes, we provide customized maintenance contracts for plumbing, HVAC, and backflow systems to ensure compliance and prevent emergencies.
