Air Conditioning and Refrigeration Repair : basic electricity for refrigeration, test meter, checking ac voltage, checking resistance with the ohmmeter, compressors, hermetic compressor, semi-hermetic compressor, capacitors and fuses, relays and contactors, transformers, circuit breakers, motor starters, safety controls, evaporator section, thermostats, optional components in condensing unit, wiring schematics, properties of refrigerants, basic mechanical refrigeration system, humidity control, basic air conditioning operation, optional controls, piping, soldering, flare and compression fittings, filter driers and air filtration, fan systems, pulleys and belts, leak testing, charging the system, field repairs of semi-hermetic compressors, heat pumps, window units, preventive maintenance, automotive air conditioning, heat reclaim, refrigeration, tools, geothermodynamics.