Air-conditioning and refrigeration mechanics work wherever they are required to install heating and cooling systems. These locations can be indoors or outdoors, at factories, industrial plants, restaurants, licensed premises, offices, private dwellings or construction sites. Their work environments can often be cramped, noisy, dirty or humid. Sometimes, they may have to work at heights. They usually work normal business hours, but may be required to be on call, day or night, to conduct emergency repairs.

Air-conditioning and refrigeration mechanics use drills, spanners, screwdrivers, hammers, welding equipment, pumps and grinders to install and repair heating and cooling units. Since their working environment can sometimes be hazardous, they are often required to wear personal protective equipment (PPE), which may include bright and reflective safety gear, hard hats, earmuffs, goggles, masks and enclosed steel-capped boots.