Eighth grade. Must possess a Miami-Dade County Certificate of Competency as a Journeyman in General Mechanical or Journeyman in Air-Conditioning. Must possess a Type II or Universal certification from an EPA recognized certification program in refrigerant transition and recovery service practices in accordance with EPA 40 CFR, Part 82, Subpart F, Section 608 of the 1990 Clean Air Act Amendment. Applicants will be subject to an extensive background investigation, fingerprint check and polygraph examination.