This task list is intended for use in planning and/or evaluating a competency-based course in heating, ventilation, and air conditioning. The guide outlines the tasks entailed in eight different duties typically required of employees in the following occupations: residential installer, domestic refrigeration technician, air conditioning and heating technician, and maintenance technician. The following duties are covered: brazing, cutting, fitting, and soldering pipe; installing and servicing electrical controls; and installing and servicing compressors, condensers, evaporators, domestic refrigerators, residential heating systems, motors and components, and heat pumps. The occupational duty/task lists are the result of an extensive two-step development process in which information on current occupational requirements was gathered from such sources as consortia, trade associations, and current curriculum materials and was then synthesized by industry representatives, vocational instructors, and state-level representatives. (MN)