Heat death is also the central plot of Asimov's short story, "the last question": https://en.m.wikipedia.org/wiki/The_Last_Question
I came across that just yesterday funnily enough through Scott Adams going on about a podcast featuring it. (American Red Pilled, Let there be light)
I haven’t watched them again now to check if it’s one of them you’re searching for, but these two videos have been posted everywhere last year:
Anyone remembers that video? Wish I could find it now.