Job Description: Install or repair heating, central air conditioning, or refrigeration systems, including oil burners, hot-air furnaces, and heating stoves. Specific Task: * Test pipe or tubing joints or connections for leaks, using pressure gauge or soap-and-water solution. * Test electrical circuits or components for continuity, using electrical test equipment. * Repair or replace defective equipment, components, or wiring. * Discuss heating or cooling system malfunctions with users to isolate problems or to verify that repairs corrected malfunctions. * Repair or service heating, ventilating, and air conditioning (HVAC) systems to improve efficiency, such as by changing filters, cleaning ducts, or refilling non-toxic refrigerants. * Connect heating or air conditioning equipment to fuel, water, or refrigerant source to form complete circuit. * Install, connect, or adjust thermostats, humidistats, or timers. * 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. * Comply with all applicable standards, policies, or procedures, such as safety procedures or the maintenance of a clean work area. * Install auxiliary components to heating or cooling equipment, such as expansion or discharge valves, air ducts, pipes, blowers, dampers, flues, or stokers. * Lay out and connect electrical wiring between controls and equipment, according to wiring diagrams, using electrician's hand tools. * Inspect and test systems to verify system compliance with plans and specifications or to detect and locate malfunctions. * Record and report time, materials, faults, deficiencies, or other unusual occurrences on work orders. * Install and test automatic, programmable, or wireless thermostats in residential or commercial buildings to minimize energy usage for heating or cooling. * Adjust system controls to settings recommended by manufacturer to balance system. * Recommend, develop, or perform preventive or general maintenance procedures, such as cleaning, power-washing, or vacuuming equipment, oiling parts, or changing filters. * Install dehumidifiers or related equipment for spaces that require cool, dry air to operate efficiently, such as computer rooms. * Install magnetic-centrifugal chillers, compressors, or related equipment to cool air temperatures through the use of recirculating water. * Cut or drill holes in floors, walls, or roof to install equipment, using power saws or drills. * Measure, cut, thread, or bend pipe or tubing, using pipe fitter's tools. * Install or repair air purification systems, such as specialized filters or ultraviolet (UV) light purification systems. * Assemble, position, and mount heating or cooling equipment, following blueprints or manufacturer's specifications. * Fabricate, assemble, or install duct work or chassis parts, using portable metal-working tools or welding equipment. * Install radiator controls for room-level zone control heating of residential or commercial buildings. * 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. * Wrap pipes, securing insulation in place with cement or wire bands. Knowledge: Mechanical, Customer and Personal Service, Computers and Electronics Skills: Repairing, Equipment Maintenance, Troubleshooting, Installation Abilities: Problem Sensitivity, Visualization, Deductive Reasoning