The twin rotary design uses two balanced compression chambers to cancel out vibration and noise, making it our quietest compressor yet. This is the heart of the Bravo Milano 18,000 BTU Universal Floor/Ceiling outdoor unit. In a Quad-Zone setup, this design is what allows you to sleep peacefully even with the condenser outside your bedroom window. For the absolute best results, mount the unit on a Wall Bracket with the included vibration-isolating rubber feet. Our Installation Kits provide the heavy-duty electrical connections needed for these high-performance motors. This compressor technology is a major reason why Bravo Milano systems have such high customer satisfaction ratings. It combines industrial-strength durability with library-quiet operation.