I just asked a very similar question over here: https://reddthat.com/post/29255208
Where I had put together a proposed self build and looking for feedback on it.
I've been running Unraid for a few years and it's been great and really user friendly as well.
This was changed last month, but I think only for air to air systems. Any air to air system which happens to also provide cooling is also included now I believe.