Install, service, and repair heating and air conditioning systems in residences and commercial establishments.

Obtain and maintain required certification(s). Comply with all applicable standards, policies, and procedures, including safety procedures and the maintenance of a clean work area. Repair or replace defective equipment, components, or wiring. Test electrical circuits and components for continuity, using electrical test equipment. Reassemble and test equipment following repairs. Inspect and test system to verify system compliance with plans and specifications and to detect and locate malfunctions. Discuss heating-cooling system malfunctions with users to isolate problems or to verify that malfunctions have been corrected. Record and report all faults, deficiencies, and other unusual occurrences, as well as the time and materials expended on work orders. Test pipe or tubing joints and connections for leaks, using pressure gauge or soap-and-water solution. Adjust system controls to setting recommended by manufacturer to balance system, using hand tools. Recommend, develop, and perform preventive and general maintenance procedures such as cleaning, power-washing and vacuuming equipment, oiling parts, and changing filters. Lay out and connect electrical wiring between controls and equipment according to wiring diagram, using electrician's hand tools. Install auxiliary components to heating-cooling equipment, such as expansion and discharge valves, air ducts, pipes, blowers, dampers, flues and stokers, following blueprints. Assist with other work in coordination with repair and maintenance teams. Install, connect, and adjust thermostats, humidistats and timers, using hand tools. Generate work orders that address deficiencies in need of correction. Join pipes or tubing to equipment and to fuel, water, or refrigerant source, to form complete circuit. Assemble, position and mount heating or cooling equipment, following blueprints. Study blueprints, design specifications, and manufacturers recommendations to ascertain the configuration of heating or cooling equipment components and to ensure the proper installation of components. Cut and drill holes in floors, walls, and roof to install equipment, using power saws and drills. Wrap pipes in insulation, securing it in place with cement or wire bands. Measure, cut, thread, and bend pipe or tubing, using pipefitter's tools. Fabricate, assemble and install duct work and chassis parts, using portable metal-working tools and welding equipment.

Mechanical -- Knowledge of machines and tools, including their designs, uses, repair, and maintenance. Customer and Personal Service -- Knowledge of principles and processes for providing customer and personal services. This includes customer needs assessment, meeting quality standards for services, and evaluation of customer satisfaction. Engineering and Technology -- Knowledge of the practical application of engineering science and technology. This includes applying principles, techniques, procedures, and equipment to the design and production of various goods and services. Design -- Knowledge of design techniques, tools, and principles involved in production of precision technical plans, blueprints, drawings, and models. English Language -- Knowledge of the structure and content of the English language including the meaning and spelling of words, rules of composition, and grammar. Building and Construction -- Knowledge of materials, methods, and the tools involved in the construction or repair of houses, buildings, or other structures such as highways and roads. Mathematics -- Knowledge of arithmetic, algebra, geometry, calculus, statistics, and their applications. Sales and Marketing -- Knowledge of principles and methods for showing, promoting, and selling products or services. This includes marketing strategy and tactics, product demonstration, sales techniques, and sales control systems. Computers and Electronics -- Knowledge of circuit boards, processors, chips, electronic equipment, and computer hardware and software, including applications and programming. Physics -- Knowledge and prediction of physical principles, laws, their interrelationships, and applications to understanding fluid, material, and atmospheric dynamics, and mechanical, electrical, atomic and sub- atomic structures and processes.

Troubleshooting -- Determining causes of operating errors and deciding what to do about it. Repairing -- Repairing machines or systems using the needed tools. Active Listening -- Giving full attention to what other people are saying, taking time to understand the points being made, asking questions as appropriate, and not interrupting at inappropriate times. Equipment Maintenance -- Performing routine maintenance on equipment and determining when and what kind of maintenance is needed. Installation -- Installing equipment, machines, wiring, or programs to meet specifications. Social Perceptiveness -- Being aware of others' reactions and understanding why they react as they do. Critical Thinking -- Using logic and reasoning to identify the strengths and weaknesses of alternative solutions, conclusions or approaches to problems. Active Learning -- Understanding the implications of new information for both current and future problem-solving and decision-making. Coordination -- Adjusting actions in relation to others' actions. Reading Comprehension -- Understanding written sentences and paragraphs in work related documents.

Extent Flexibility -- The ability to bend, stretch, twist, or reach with your body, arms, and/or legs. Finger Dexterity -- The ability to make precisely coordinated movements of the fingers of one or both hands to grasp, manipulate, or assemble very small objects. Problem Sensitivity -- The ability to tell when something is wrong or is likely to go wrong. It does not involve solving the problem, only recognizing there is a problem. Manual Dexterity -- The ability to quickly move your hand, your hand together with your arm, or your two hands to grasp, manipulate, or assemble objects. Arm-Hand Steadiness -- The ability to keep your hand and arm steady while moving your arm or while holding your arm and hand in one position. Inductive Reasoning -- The ability to combine pieces of information to form general rules or conclusions (includes finding a relationship among seemingly unrelated events). Trunk Strength -- The ability to use your abdominal and lower back muscles to support part of the body repeatedly or continuously over time without 'giving out' or fatiguing. Oral Expression -- The ability to communicate information and ideas in speaking so others will understand. Deductive Reasoning -- The ability to apply general rules to specific problems to produce answers that make sense. Information Ordering -- The ability to arrange things or actions in a certain order or pattern according to a specific rule or set of rules (e.g., patterns of numbers, letters, words, pictures, mathematical operations).

Performing General Physical Activities -- Performing physical activities that require considerable use of your arms and legs and moving your whole body, such as climbing, lifting, balancing, walking, stooping, and handling of materials. Repairing and Maintaining Mechanical Equipment -- Servicing, repairing, adjusting, and testing machines, devices, moving parts, and equipment that operate primarily on the basis of mechanical (not electronic) principles. Handling and Moving Objects -- Using hands and arms in handling, installing, positioning, and moving materials, and manipulating things. Getting Information -- Observing, receiving, and otherwise obtaining information from all relevant sources. Operating Vehicles, Mechanized Devices, or Equipment -- Running, maneuvering, navigating, or driving vehicles or mechanized equipment, such as forklifts, passenger vehicles, aircraft, or water craft. Performing for or Working Directly with the Public -- Performing for people or dealing directly with the public. This includes serving customers in restaurants and stores, and receiving clients or guests. Making Decisions and Solving Problems -- Analyzing information and evaluating results to choose the best solution and solve problems . Communicating with Persons Outside Organization -- Communicating with people outside the organization, representing the organization to customers, the public, government, and other external sources. This information can be exchanged in person, in writing, or by telephone or e-mail. Inspecting Equipment, Structures, or Material -- Inspecting equipment, structures, or materials to identify the cause of errors or other problems or defects. Communicating with Supervisors, Peers, or Subordinates -- Providing information to supervisors, co-workers, and subordinates by telephone, in written form, e-mail, or in person.