The general purpose of the occupational analysis is to provide workable, basic information dealing with the many and varied duties performed in the air conditioning, refrigerating, and heating occupation. The document opens with a brief introduction followed by a job description. The bulk of the document is presented in table form. Six duties are broken down into a number of tasks and for each task a two-page table is presented, showing on the first page: tools, equipment, materials, objects acted upon; performance knowledge (related also to decisions, cues and errors); safety--hazard; and on the second page: science; math--number systems; and communications (performance modes, examples, and skills and concepts). The duties include installing, troubleshooting, servicing, and repairing refrigeration and air conditioning equipment and warm air heating systems. Included are lists for a standard tool kit, test equipment, and standard supplies. An appendix relates the duties to air conditioning, refrigeration, and heating. (BP)