To choose the right type of refrigerant certification, HVAC technicians should consider the type of equipment they work with and the amount of refrigerant involved. For example, technicians working on small appliances with less than 5 pounds of refrigerant should obtain a Type I certification, while those working on high-pressure equipment, such as residential and commercial air conditioning systems, should obtain a Type II certification. Technicians working on low-pressure equipment, such as chillers, should obtain a Type III certification. It’s essential to review the EPA’s guidelines and consult with industry experts to determine the appropriate certification for your specific work.