Hi all, I'd like an explanation as to how the latest series of inverters seem to manage to double the efficiency of older a/c's. Previously an efficient machine ran with an eer or cop of up to 350%. ie. An input of 1kw for an output of 3.5kw. Recently I've seen several manufacturers claiming efficiencies up to 600%. An example is the Mitsubishi Heavy Industries MHI050705_RAC_SupDelux.pdf < can't post links sadly so that didn't work. The SRK25ZDXA-S claims to use 500w and put out 2.5kw for an eer of 5. Is this because of an increased volumetric efficiency and condensing capacity at 50% load? If so is it simply a case of fudging the figures because the eer would reduce as load did? It's hurting my head so I'd be glad if someone could shed light on what I suspect is pr spin.