Energy efficiency is a critical factor in refrigerant selection, as it directly impacts the system’s operating costs and environmental sustainability. Refrigerants with higher energy efficiency can reduce energy consumption, leading to cost savings and lower greenhouse gas emissions. When evaluating refrigerants, consider factors such as the coefficient of performance (COP), energy efficiency ratio (EER), and seasonal energy efficiency ratio (SEER). These metrics help compare the energy efficiency of different refrigerants and ensure that the selected refrigerant meets the system’s energy efficiency requirements.