*Multiplex refrigeration systems have multiple compressors that are piped with common suction and discharge refrigeration lines. Using multiple compressors in parallel provides a means of capacity control, since the compressors can be selected and cycled as needed to meet the refrigeration load. Please contact us for more detail regarding eligibility and program restrictions. PG&E has additional programs that you may qualify for if you do not meet the eligibility requirements of the Cool Biz Program.