IIRC, 'Freon' was the 'HomeStation' aka Xbox 1.5 (not really Xbox 1.5 since it was probably the same chipset) basicly an Xbox1 with all kinds of extra features & functions. pretty much like Sony's PSX.
now I suppose that the so called 'Xbox Next PC' which is the 3rd
and most expensive version of Xbox2/Xenon, might be concidered
'Freon 2' or 'HomeStation 2'