Hands-on with commercial refrigeration Maintain and repair HVAC equipment You excel in programs that involve problem-solving and working with your hands. You enjoy grasping new concepts or completing a project or task. You may have started your career in specific areas of HVAC/R and want to switch to another. You also look for the same outcomes with less investment of time and money. It all comes together at CLC. This certificate prepares you to work in a trainee or entry-level position servicing commercial-grade refrigeration appliances, including reach-in and walk-in coolers.