# Heating, Air Conditioning, and Refrigeration Mechanics and Installers > Install or repair heating, central air conditioning, HVAC, or refrigeration systems, including oil burners, hot-air furnaces, and heating stoves. - Code: 49-9021.00 (O*NET-SOC; SOC 2018 49-9021) - Family: [Installation, Maintenance & Repair](https://foundation.org.ai/occupations#family-49), one of its 52 occupations - Tasks: 30 tasks (27 core, 1 supplemental and 2 not rated) - Page: https://foundation.org.ai/occupations/49-9021.00 - JSON: https://foundation.org.ai/data/tasks/49-9021.00.json ## What the work is made of 1. Test electrical circuits or components for continuity, using electrical test equipment. Core task · Task 23552 · Rated by 56 people who do the job, August 2022 2. Comply with all applicable standards, policies, or procedures, such as safety procedures or the maintenance of a clean work area. Core task · Task 23557 · Rated by 52 people who do the job, August 2022 3. Study blueprints, design specifications, or manufacturers' recommendations to ascertain the configuration of heating or cooling equipment components and to ensure the proper installation of components. Core task · Task 23558 · Rated by 52 people who do the job, August 2022 4. Discuss heating or cooling system malfunctions with users to isolate problems or to verify that repairs corrected malfunctions. Core task · Task 23554 · Rated by 52 people who do the job, August 2022 5. Connect heating or air conditioning equipment to fuel, water, or refrigerant source to form complete circuit. Core task · Task 23555 · Rated by 51 people who do the job, August 2022 6. Adjust system controls to settings recommended by manufacturer to balance system. Core task · Task 23565 · Rated by 56 people who do the job, August 2022 7. Recommend, develop, or perform preventive or general maintenance procedures, such as cleaning, power-washing, or vacuuming equipment, oiling parts, or changing filters. Core task · Task 23568 · Rated by 55 people who do the job, August 2022 8. Inspect and test systems to verify system compliance with plans and specifications or to detect and locate malfunctions. Core task · Task 23562 · Rated by 52 people who do the job, August 2022 9. Repair or replace defective equipment, components, or wiring. Core task · Task 23553 · Rated by 54 people who do the job, August 2022 10. Install or repair self-contained ground source heat pumps or hybrid ground or air source heat pumps to minimize carbon-based energy consumption and reduce carbon emissions. Core task · Task 23579 · Rated by 51 people who do the job, August 2022 11. Install, connect, or adjust thermostats, humidistats, or timers. Core task · Task 23556 · Rated by 55 people who do the job, August 2022 12. Install auxiliary components to heating or cooling equipment, such as expansion or discharge valves, air ducts, pipes, blowers, dampers, flues, or stokers. Core task · Task 23559 · Rated by 55 people who do the job, August 2022 13. Braze or solder parts to repair defective joints and leaks. Core task · Task 23560 · Rated by 55 people who do the job, August 2022 14. Lay out and connect electrical wiring between controls and equipment, according to wiring diagrams, using electrician's hand tools. Core task · Task 23561 · Rated by 51 people who do the job, August 2022 15. Perform mechanical overhauls and refrigerant reclaiming. Core task · Task 23564 · Rated by 55 people who do the job, August 2022 16. Install expansion and control valves, using acetylene torches and wrenches. Core task · Task 23566 · Rated by 55 people who do the job, August 2022 17. Measure, cut, thread, or bend pipe or tubing, using pipe fitter's tools. Core task · Task 23571 · Rated by 56 people who do the job, August 2022 18. Mount compressor, condenser, and other components in specified locations on frames, using hand tools and acetylene welding equipment. Core task · Task 23570 · Rated by 55 people who do the job, August 2022 19. Install dehumidifiers or related equipment for spaces that require cool, dry air to operate efficiently, such as computer rooms. Core task · Task 23567 · Rated by 51 people who do the job, August 2022 20. Record and report time, materials, faults, deficiencies, or other unusual occurrences on work orders. Core task · Task 23563 · Rated by 56 people who do the job, August 2022 21. Keep records of repairs and replacements made and causes of malfunctions. Core task · Task 23572 · Rated by 55 people who do the job, August 2022 22. Cut or drill holes in floors, walls, or roof to install equipment, using power saws or drills. Core task · Task 23569 · Rated by 54 people who do the job, August 2022 23. Estimate, order, pick up, deliver, and install materials and supplies needed to maintain equipment in good working condition. Core task · Task 23574 · Rated by 55 people who do the job, August 2022 24. Schedule work with customers and initiate work orders, house requisitions, and orders from stock. Core task · Task 23575 · Rated by 55 people who do the job, August 2022 25. Supervise and instruct assistants. Core task · Task 23576 · Rated by 55 people who do the job, August 2022 26. Lay out reference points for installation of structural and functional components, using measuring instruments. Core task · Task 23577 · Rated by 55 people who do the job, August 2022 27. Lift and align components into position, using hoist or block and tackle. Core task · Task 23578 · Rated by 55 people who do the job, August 2022 28. Install or repair air purification systems, such as specialized filters or ultraviolet (UV) light purification systems. Supplemental task · Task 23573 · Rated by 53 people who do the job, August 2022 29. Repair or service heating, ventilating, and air conditioning (HVAC) systems to improve efficiency, such as by changing filters, cleaning ducts, and refilling non-toxic refrigerants. Not rated · Task 23580 · Listed by O*NET analysts, November 2020 30. Test pipes, lines, components, and connections for leaks. Not rated · Task 23581 · Listed by O*NET analysts, November 2020 ## More in Installation, Maintenance & Repair - [Aircraft Mechanics and Service Technicians](https://foundation.org.ai/occupations/49-3011.00): 38 tasks - [Audiovisual Equipment Installers and Repairers](https://foundation.org.ai/occupations/49-2097.00): 11 tasks - [Automotive Body and Related Repairers](https://foundation.org.ai/occupations/49-3021.00): 25 tasks - [Automotive Glass Installers and Repairers](https://foundation.org.ai/occupations/49-3022.00): 18 tasks - [Automotive Service Technicians and Mechanics](https://foundation.org.ai/occupations/49-3023.00): 30 tasks - [Avionics Technicians](https://foundation.org.ai/occupations/49-2091.00): 13 tasks - [Bicycle Repairers](https://foundation.org.ai/occupations/49-3091.00): 14 tasks - [Bus and Truck Mechanics and Diesel Engine Specialists](https://foundation.org.ai/occupations/49-3031.00): 26 tasks - [Camera and Photographic Equipment Repairers](https://foundation.org.ai/occupations/49-9061.00): 15 tasks - 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