You are right that the surge protection feature has nothing to do with heat, but that message does rule out heat as a problem.
However, back to the surge protection message, frankly, we have found here that the ASUS Surge Protection feature often causes more problems than it is worth for some users. It just has too many false positives triggering a shut down when unnecessary. The feature has been around for several years. Typically, if one maker comes up with a good feature, other makers quickly follow suit. Yet pretty sure Gigabyte, MSI, and other motherboard makers have not implemented their own version of this feature. That suggests to me they have not found it worthwhile, or in demand either.
Still, it cannot simply be ignored because it certainly can indicate a failing power supply. So again, back to my first post above and you need to find, beg or borrow a known good supply to swap in there and see if the problem remains, or goes away.
Which is totally immaterial. I suspect you are not the OP's roommate or next door neighbor. And besides, we still don't know if the computer room is air conditioned or not - which is why I asked if the room is climate controlled.