Analyzes and maintains control systems that include electrical, electronic, and pneumatic sensors and actuators; lay out, fabricate, and install mechanical, pneumatic, electrical, and electronic temperature and humidity controls for heating and ventilation systems; repair relays, timers, meters, and switches with local or remote computer control; reads and interprets blueprints. • Keeps records of work performed and supplies used; uses such tools as drill presses, grinders, bandsaws, hand drills, testers, welding equipment, soldering guns, small hand tools, and specialized apparatus; estimates and orders materials and supplies needed to maintain equipment in good working condition; leads and instructs helpers, patients, or inmates.