Here are some interesting innovations in compressor technology seen at the 2004 AHR Exposition.
The most interesting (at least for me) is a new scroll compressor in the residential size range that Copeland has come up with. What is different about this compressor is that the design allows for multiple changes in operating capacity at a much lower cost and using a simpler design than we have seen in the past. This makes it possible to come up with far more efficient air conditioners and heat pumps at a lower price than ever before, and it allows for some important potential design changes in HVAC (and HVACR) equipment.