- HVAC Technicians: Install and maintain heating, ventilation, and air conditioning systems.
- Plumbers: Install and repair plumbing systems.
- Electricians: Install and maintain electrical systems.
- Fire Safety Experts: Install and maintain fire safety systems.
- Duct Installers: Install and maintain ductwork for HVAC systems.
- Pipefitters: Assemble and maintain piping systems.
- Boiler Operators: Operate and maintain boiler systems.