Perform skilled, complex work on the repair, maintenance, and installation of commercial HVAC systems, air conditioning, heating units, heat pumps, hermetic compressors, exhaust fans, economizers, unit and radiant heaters. Demonstrated ability to perform rigorous outdoor and indoor duties including walking, standing, climbing, stooping, squatting, bending, twisting, kneeling, reaching, sitting, lifting, grasping, pushing, pulling, manual dexterity, etc.