The EEV is a motorized valve that replaces old-fashioned fixed orifices to provide precise control over refrigerant flow. Our Dual-Zone outdoor units utilize separate EEVs for each port to ensure each room gets exactly what it needs. This is what allows a Bravo Milano 9,000 BTU to run alongside a much larger unit without issues. To ensure these sensitive valves are not damaged during installation, use the vacuum pumps and gauges found in our Installation Kits. If the outdoor unit is on a Wall Bracket, the lack of vibration helps these valves operate with extreme precision. You can see how this technology impacts your daily life through the lower energy bills associated with our Single-Zone systems. It is the most advanced way to manage the "pulse" of an HVAC system.