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Anyway to really increase efficiencies of..
packaged closed loop water source heat pumps? In our building we have hundreds of 1/2 ton horizontal discharge, 1.5 and 2.5 ton counterflow floor models. They are Command Aire models with TXV's and no longer in business. They were built in the early 90's so I'm guessing the seer is around 10? (no paperwork). They asked me to look to see if efficiency could be increased as they are rebuilt rather than replacing them because the return and supply ducting and water supplies would all have to be retrofitted. Any ideas...controls, motors, compressors, etc.