An EEV is a sophisticated component that precisely regulates the flow of refrigerant through the system based on real-time sensor data. Unlike older fixed-orifice systems, an EEV can adjust its opening thousands of times per hour to maintain peak efficiency. This allows our multi-zone systems to deliver the exact amount of cooling needed for each room. You will find EEV technology in our premium Mitsubishi and Cooper&Hunter lines. It is a critical factor in achieving the high SEER2 ratings found in our great deals and more section. Using an EEV also improves the system's ability to provide consistent humidity control during partial-load conditions.