[Buckeye]

As I stated in your other thread, those go down to -300F not C, so its like -149c.
It uses LN2 vapor to cool which does not get as cold as liquid. What makes LN2 and ther Refrigerants cold is when it evaporates or changes state from liquid to gas.

LHe goes down to about -250c or so and that is the coldest they have gotten.