I am reviving this thread in hope of a rethink on the subject. Parallel compressors have been used in commercial refrigeration for many years. Kysor Warren builds most of Walmart's refrigeration units and as far as I know they use this method exclusively. I spent a few months at their Columbus assembly plant where I saw several models in various phases of construction.
Multiple compressors require suction accumulators and liquid receivers to handle varying load requirements. Residential HVAC systems rely on the can around a hermetic compressor to store idle refrigerant. I don't think this is practical with multiple compressors. FWIW, commercial compressors are not hermetic units.
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