Your Single Source for Energy & Mechanical Services
Distributed Energy & Efficiency Solutions
Modularization & Prefabrication
Engineering, BIM, VDC, Design Build & more

Energy Services & Mechanical Contractors

MEP Services is part of Equans North America and is comprised of the following companies:

  • H.T. Lyons
  • B-G Mechanical
  • Trystate
  • Fred Williams

Equans is the world leader in technical services with businesses in 17 country and some 74,000 employees. Designing and implementing customized solutions to improve customers’ buildings, technical equipment, systems and processes and supporting them in optimizing their use is the mission of Equans.

Equans North America has more than 40 years of experience and its nearly 5,000 employees serve a broad range of customers throughout the commercial, industrial, institutional and municipal segments.

MEP Services is one of Equans’ services operations providing a unique combination of in-house capabilities and the latest technologies to improve asset value, sustainability, resiliency, comfort, energy savings and safety such as:.

Mechanical (HVAC)

  • Heating, ventilation & air conditioning
  • Indoor air quality (IAQ)
  • Boiler & chiller repair – all types
  • “U” & “S” stamps, “R” Board Certification

Facility Services

  • Building operations
  • Emergency service 24/7
  • Preventive maintenance
  • Continuous remote monitoring

Engineering & Planning

  • Mechanical, plumbing & industrial
  • Building Information Modeling (BIM)
  • Virtual Design & Construction (VDC)
  • Energy & project engineering

Distributed Energy Resources

  • Generation & co-generation
  • Renewables
  • Thermal & electrical energy storage
  • Microgrids

Off-Site Construction

  • Modularization
  • Prefabrication
  • Sheet metal fabrication
  • Piping solutions fabrication


  • Design-Build & Design-Assist
  • Integrated Project Delivery (IPD)
  • MEP construction
  • Process piping solutions

Specialty Services

  • Balancing & Testing
  • Commissioning: BCx, EBCx & RCx
  • Building controls service & design
  • Energy management

Energy Efficiency Solutions

  • Energy audits (Levels I, II & III)
  • Energy Efficiency Measures (EEMS)
  • Energy Management Systems (EMS)
  • Building Management Systems (BMS)

Our Companies

MEP Services operates from numerous locations throughout the Northeast to service Pennsylvania, Maryland, Delaware, New Jersey, New York, Massachusetts, New Hampshire, Rhode Island, Connecticut, and Vermont. Our team is able to serve clients in other states.