The inverter compressor is the "heart" of the outdoor unit, regulating the flow of refrigerant. Unlike standard compressors, it doesn't just run at 0% or 100%. The Bravo Milano Series 2 Zone 24,000 BTU uses this to achieve high efficiency. You can see various compressor capacities in our Tri-Zone collection. By adjusting speed, the compressor uses only the energy needed to maintain the setpoint. This technology is what makes modern mini-splits so much quieter than old window units.