REQUIRED KNOWLEDGE, SKILLS, AND ABILITIES : Comprehensive knowledge of the methods, materials, tools and practices used in HVAC, plumbing, electrical, general maintenance, and computerized energy management procedures and components. Must posses and maintain thorough knowledge of new technologies related to job responsibilities. Ability to interpret and follow the BOCA Mechanical Codes and Arlington County ordinances for proper installation and/or repair of mechanical equipment. Ability to interpret and utilize blueprints and schematics, wiring codes. Ability to observe general building conditions in order to trouble-shoot and repair mechanical systems. Ability to follow written and oral instructions, diagrams, blueprints, schematics (mechanical, electrical and electronic) and manufacturer's manuals, Ability to estimate time and materials needed for small jobs and to perform routine record keeping tasks, written reports and mathematical computations. Ability to inspect, diagnose problems and make repairs or request appropriate support personnel from APS in HVAC, plumbing, electrical systems, and other services. Ability to work cooperatively with school professional and custodial staff and maintenance personnel.