rickman wrote in :

It takes the same amount of heat to
raise a substance 1 degree at 77 °K as it does at room temperature.

Ok, but when I read (or hear on BBC radio science programs) that it takes FAR
more effort (energy) to pump from 2K to 1K than it does from 300K to 299K,
what am I supposed to make of that given what you just said?