Mechanics may also be called heating and air conditioning technicians, or environmental control system installers or servicers. The majority of mechanics are employed in the construction, services, and trade industries. Mechanics work from blueprints, design specifications, and manufacturer instructions to install compressors, motors, condensers, thermostats, fans, ducts, pipes, and other mechanical, electrical, and electronic components into place. They use hand tools such as wrenches, electric drills, pipe cutters and benders, acetylene torches, and hammers to connect parts to duct work, gas and refrigerant lines, and other piping.
Mechanics also use test instruments such as voltmeters, thermometers, and manometers.
After attaching temperature and pressure control testing devices, the mechanics charge the system with refrigerant, and then test it for proper operation, making any necessary final adjustments. After the source is identified and the necessary repairs are made, the unit is reassembled and tested. Mechanics usually work independently, but depending on the job, may work with electricians or sheet metal workers. On large projects, electrical work may be done by electricians, pipe and other component installation by plumbers and pipe fitters, and duct work by sheet metal workers. Mechanics are trained to install and service both residential and commercial heating and air conditioning units and commercial refrigeration systems.