It’s been more than a decade since oil-free magnetic bearing centrifugal compressors hit the HVAC market. With unheard-of part-load energy efficiency and zero oil-related maintenance, these ultra-quiet machines are totally sustainable because there is no oil to change the heat transfer rates in the heat exchangers. Now there are more than 35,000 of them out there logging over 55 million run-hours, and all of them have an initial cost premium.
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