I made this post on the subreddit and I was told to go here with my questions for more technical answers. So this is just the copy of what my reddit post.
"What I understand (at least I think I understand) is that temp shift plates interact in 3x3 area, but do not exchange heat with buildings or objects. That they have thermal mass proportional to their specific heat (since they all have the same mass). And the better their conductivity, the faster they are at transferring heat.
Tempshifts are merely 3x3 buildings.
Tempshifts have 160kg effective thermal mass, compared to a normal tile's 200kg. This is because buildings count for 1/5th their mass.
They have normal building interactions when buried in solid (200x heat transfer) or submerged in fluid (1x heat transfer).
When utilizing them for thermal capacity, it is best to cover as much area as possible.
It is. You can heat up neutronium with tempshifts, but not cool them.