134a r 407 r 410 r 22 etc moreover a composition of the inventive subject matter could be used in a novel unit comprising a different ratio of compressor size to coil size for example as compared to an existing refrigeration unit having a compressor size to coil size ratio of x y a new unit can have a ratio of x u2212 z y x z y x y u2212 w or x y w wherein z is at least 10 20 30 50 or even 75 or more of x and wherein w is at least 10 20 30 50 or even 75 or more of y as another example a new unit can have a greater number of or a different configuration of coils one possible composition of the inventive subject matter is the novel bluon u2122 tdx u2122 bluon tdx comprises a mixture of approximately 95 99 wt of 1 1 1 2 tetrafluoroethane i e r 134a at least partially complexed with approximately 1 5 wt of b1 u2122 a non toxic oil blend comprising one or more organic oils wherein the oil blend has an oleic acid to linoleic acid ratio of between 70 30 and 50 50 and preferably approximately 60 40 wt the organic oils of b1 can.