I have been out of the a/c and refrigeration loop for several years, but I have found myself back. I had been an electrical inspector and focusing on that. I have heard about 134a of course, but I know there several new ones out there. Then there are the polyester oils? I will be happy with generalities, but specifics would be nice. Maybe someone knows of some good books or mags on the latest stuff? I am curious about window units, residential central air, Walkin and chest type refrigerators and freezers, etc. Thanks!
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new refrigerants and oils?
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