Job Requirements (Education, Experience, Professional Associations): Minimum 3 years' experience performing the following: Maintaining, modifying, troubleshooting, repairing, adjusting, calibrating, validating, certifying, testing, and operating domestic and industrial year-round air conditioning and heating units. Essential Duties & Job Functions: Maintain, modify, troubleshoot, repair, adjust, calibrate, validate, certify, test and operate domestic and industrial year-round air conditioning and heating units.