24/7/365 Emergency Service

HVAC Service & Maintenance

HVAC Service & Maintenance

A high-performance, energy-efficient building always starts with an intelligent design, but just as important are well-maintained HVAC systems. Most building owners know that environmental comfort is the number one concern for building occupants. Mechanical systems also represent the highest total consumption of energy in most buildings.

Fidelity Mechanical Services has one of the largest and most sophisticated HVAC service groups that serve the Baltimore, Washington, D.C., and Northern Virginia metropolitan areas. We have three Fidelity Mechanical Services locations staffed with hundreds of factory-trained technicians and HVAC system experts. Maintaining high-performance buildings and preventing mechanical failures through proactive planned maintenance is our business.

Planned Maintenance & Service Agreements
24/7 Emergency Service by Factory-Trained Technicians
Central Plant Chiller & Cooling Tower Service, Overhauls, & Replacements
LEED Building Services & Systems Commissioning
Mission-Critical High-Density Cooling Systems
Remote Building Monitoring 24/7/365
Environmentally Friendly Refrigerant Conversions
Variable Frequency Drives (VFD)
High-Efficiency Variable Refrigerant Flow (VRF) Systems
Professionally Engineered Retrofits with Integrated Energy Solutions
Emergency HVAC Rentals

Engineered Retrofits

All too often, other companies replace like-for-like equipment without engineering for today’s shifting requirements and improved equipment efficiencies. When it’s time to build or replace HVAC Systems or fit out a building, Fidelity Mechanical Services offers a single-source solution through our design and installation of mechanical systems—for best-in-class, one-stop service.

Chiller Overhauls & Maintenance

Fidelity Mechanical Services’ Central Plant Group are experts in the overhaul and maintenance of centrifugal, screw, scroll and reciprocating chiller plants. Our technicians are factory-trained in most major brands including York/Johnson, Trane, McQuay, Carrier, Krauss, and Multi-Stack. We offer extremely competitive service, maintenance and overhaul rates with warranty guarantees.

Our Central Plant Chiller Group is backed by our professional engineering and energy consulting experts to further help in equipment selection and operation based on energy models, Integrated Part Load Values (IPLV) of the chillers, as well as optimization considering usage and utility rate schedules.

Mission-Critical Facilities Services

The Fidelity Mechanical Services Critical Facilities Group are experts in mission-critical facility services. Our design engineers and service team understand that your business or organization depends on a reliable infrastructure to support your data center or server room.

Precision power and environmental control are just the beginning. Our proactive approach to infrastructure design and service gives IT professionals and facility managers the confidence and reliability necessary to keep their businesses up and running.

On-site Operations & Maintenance

Fidelity Mechanical Services' On-site Operations and Maintenance Group is a perfect solution for building owners and managers to economically outsource their total HVAC operations and maintenance requirements. We offer full-time, on-site technicians who will intimately understand your building’s mechanical and building controls system. Our technical expertise allows us to keep your buildings operating at their peak performance.

Our on-site teams are backed by in-house professional engineers and energy experts who can further help develop comprehensive mechanical and demand-side energy plans.

Markets We Serve

Fidelity Mechanical Services understands that its clients’ buildings are more than just bricks and mortar. These are facilities that perform life-saving services, educate students, provide valuable research and more. For over 75 years, Fidelity Mechanical Services has serviced a variety of important markets including:
Commercial Buildings
Mission-Critical Facilities
SCIF Facilities
Fidelity Mechanical Services® is the premier provider of HVAC/Mechanical design, installation, and service in the Mid‐Atlantic region.



25 Loveton Circle
Sparks, Maryland 21152


20700 Loudoun County Parkway
Suite 140
Ashburn, Virginia 20147


7001 Muirkirk Meadows Drive
Suite E
Beltsville, Maryland 20705


1416-1422 Desoto Road
Baltimore, Maryland 21230
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