That isn't consistent with K and C though. -K doesn't exist. And water doesn't become more frozen at -C (well I guess it technically becomes different kinds of frozen).

Zero in that sense represents the absolute limit that one could exist in a particular state, which for F would be comfort? I guess the issue with humans is that 0 would be very subjective. But I think for almost all humans, the limit would be closer to 40F than 0F.