An Electronic Expansion Valve (EEV) is a sophisticated metering device that uses a small stepper motor to precisely control the flow of refrigerant into the evaporator coil. Unlike older mechanical valves, an EEV can adjust its position in hundreds of tiny increments based on data from the system's sensors. This level of precision is what allows Inverter Technology systems to be so much more efficient than traditional on/off units. Most of our Ductless Mini Splits and Multi-Zone Systems utilize EEVs to provide perfect cooling in all conditions. By constantly optimizing the refrigerant flow, the EEV ensures the Compressor never works harder than it needs to. This component is key to achieving the 20+ SEER2 ratings found in our top-tier Cooper-Hunter equipment. While more complex than a Capillary Tube, the EEV is the most important factor in modern high-efficiency cooling. It is the "brain" of the refrigeration cycle.