I guess there's not much you can do about it, but imho the RAM usage TaN is generating over time is a bit ridiculous. (Found that problem on a 1.10 version in SimpleLife2 modpack and now have it in my own modpack i'm working at 1.12.2)

My guess would be that the temperature handling is generating a huge amount of data in memory that never gets cleared the right way or it has something to do with seasons. (But could be wrong too about that detail.)

Anyway, i first noticed a unusual RAM usage in the SimpleLife2 modpack a few weeks back when we played it (2 players) and that the server was breaking the 8GB limit after a few hours playing. I even noticed on a day when we didn't played for long (and i already was trying to find the cause of the RAM usage) that it kept increasing even after all players left the server.

Now some days ago, when i added TaN to my own modpack - that ran stable for over 4 days (w/o restart) at 2GB RAM used with 100+ mods - i had that exact problem again, now in 1.12.2.
From a stable 2GB RAM usage, my server went to break it's 8GB limit within 6 hours of no one playing.
Watched it for 2 more days, every day the same: Restart server, play like half an hour, leave it alone for 5-6 hours and the limit was broken again.
I then removed TaN, and it went back to normal again.

I know a while back there was a similar issue (but much faster RAM increase) with heat coils, but as i deactivated players being affected by temperature and there where no TaN items placed at all i guess it's something in the environment temperature handling.

Really hope you could fix that. I really love the mod but it just isn't bearable that a single mod uses more resources then 100 others, nor is it fun if a server is forced to restart every 6 hours