Subject standing, walking, sitting, repetitive motion, reaching, climbing stairs, bending for extended periods of time, stooping, kneeling, crouching, crawling, pushing, pulling, driving, handling, use of vision, depth perception, reaching, forceful gripping, twisting, balancing, client/customer contact, squatting, working in cramped or confined spaces or areas for extended periods of time to perform the essential functions. Performs skilled journey level work for preventive maintenance, repairs, and additions to County heating, ventilation, air conditioning and refrigeration (HVAC) systems, including preventive maintenance and repairs on large chillers, heating boilers, water treatment systems and associated equipment.