Which type of mobile AC system will usually require additional time and precautions to extract all the refrigerant?

Mobile AC systems that utilize refrigerants with high pressures, such as R-134a or R-1234yf, typically require additional time and precautions to extract all the refrigerant. These systems often have more complex components and tighter refrigerant lines, making complete recovery more challenging. Technicians must use specialized recovery equipment and follow safety protocols to ensure that all refrigerant is safely extracted and properly disposed of, minimizing environmental impact.