Heating, air conditioning and refrigeration mechanics and installers typically do the following: Use blueprints or design specifications to install or repair HVACR systems. Inspect and maintain customers’ HVACR systems. Test individual components to determine necessary repairs. Repair or replace worn or defective.

A machine is a mechanical structure that uses power to apply forces and control the movement to perform an intended action. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.