A useful way to think about it (and I think what the OOP is saying) is to think about it as a scale from 0-100. Where 0 is like the coldest humans can deal with and 100 is the hottest humans can deal with. Obviously this isn’t strictly true (it gets to like 115 in death valley) but as an imperfect generalization it’s pretty useful.
This doesn’t help at all but last I checked heat death was out and big freeze is in (spreading out to such a level that subatomic particles pull apart into basically nothingness).