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Fidelity Building Services Group
- Air One Industries, LLC
- Air Technologies of Oklahoma City, LLC
- Benchmark Automation and Controls
- Central Tech Services, Inc.
- Chesapeake Mission Critical, LLC
- Chesapeake Systems, LLC
- Chesapeake Systems, LLC dba Field Product Support
- Chesapeake Systems, LLC dba GoodTower Services
- Cii Engineered Systems, Inc.
- Cii Service of Central Virginia, Inc.
- Cii Service of North Carolina, Inc.
- Cii Service of Southwest Virginia, Inc.
- CT/HX, LLC
- Cyrco, Inc.
- Darnold Mechanical, LLC
- Environmental Systems Company, LLC
- Fidelity Engineering, LLC
  - Schilling Cleaning Products
  - Sparks Auto Shop
  - Sparks Cleaning Products
  - Sparks Warehouse
- Fidelity Engineering LLC - ServiceX MEP
- Fidelity Mechanical Services
  - Ashburn Warehouse
  - Fidelity Mechanical Services
- Fidelity Power Systems
  - Schilling Warehouse
  - Sparks Warehouse
- Harry E. Nason, Inc. dba Nason Mechanical Systems
- H.E. Neumann Company
- HVAC Control Technology, L.L.C.
- James Lane Air Conditioning Company, LLC
- James Lane Fire Protection
- Lyons Mechanical Services
- Metro Building Services, LLC
- Metro Mechanical, LLC
- PCE LLC
- Smart Building Technologies, LLC
- Sojam, LLC dba Martin J. Braun
- Star Service, Inc. of Houston
- Star Service Inc. of Jackson
- Star Service Inc. of Little Rock
- Star Service Inc. of Mobile
- Star Service, Inc. of NOLA
- St Johns Air LLC
- Systems Contractors, LLC
- System Service & Engineering
- Tropic-Kool LLC
- United Mechanical, LLC

Chesapeake Mission Critical, LLC

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