Spectacular! Thank you so much for sharing this handy mod! Now people can make Seasonally themed CAS screens if they'd like.

Question, does this mod change only the freezing behaviour in CAS, or does it disable the temperature mechanic from Seasons altogether?

Great idea to tackle a common problem though. I've got an AnyGameStarter with no Seasons just for custom CAS environments, but this is a good alternative.

Only freezing in CAS.

Okay, after this comment I actually went and looked inside the file to see what you did to disable it only in CAS and... that's actually so trivial. I can't believe Maxis didn't put this check in themselves.

Welp, time to uninstall that AnyGame! And thank you for the mod!

Thank you very much Lenna9 !!! I had waited for this Fix-Mod for years!!! i think it was 10 years ago the last time i used a custom CAS and my sims would freeze to death . I had to stop using them anymore. It was a pity , there were some very cool CAS's. I have played this game since its first release, and i still do XD , thank u again

I've waited a whole decade for this. ? May you find fortune and happiness this year.

Finally i can edit my custom cas without freezing, thank you!

Does this also prevent stray pets from showing up in CAS or do we still need to disable Pets with AnyGameStarter?

No and unfortunately I still can't figure out what's causing this bug - the stray controller seems to have all the necessary checks. But I have 2 potential solutions to this problem:
Fence the lot. This will not fix the bug, but will make it not visible.
Delete all controllers from the lot. You have to move Sim into the lot, force errors on off-world using the Batbox, click "Delete" on every window that appears, move out the Sim (of course, you will also need Stay Thing Shrub) and clean the lot of a Sim references using the Lot Compressor (with new knowledge about neighborhood corruption, I'm not sure this last is necessary). If you do this, it will also fix freezing Sims without my fix.

You don't need to disable Pets at all to have no stray pets in CAS, I never disabled Pets when I made my custom CAS screen, only Seasons (and even that restriction is now gone).

Any mod that disables stray pets altogether works just as fine, MATY's nostrayrespawn is what I use. You can also take this mod out for when you play normally, and just put it in for when you need it, like how I also handle the No Plumbobs mod for example.

Alternatively of course, you can do what @Lenna9 suggested and just fence the lot off on the outside, or clean the lot of controllers (but the latter is honestly more time-consuming than just getting a no-strays mod).

EDIT: The no-stray mod doesn't prevent wolves or the Leader of the Pack from spawning, of course. But these can only show up at night anyway, and I've never seen it become night in CAS before.

Regarding strays, I came up with an idea, but have no way of testing it right now.

Instead of forcing errors on controllers, would it be enough to just delete pedestrian portal objects using Portal Revealer?
Pros: the method's faster.
Cons: while the strays may not appear on the lot (having no feasible way to "arrive" there), it could be that the strays still get spawned, but don't appear.

I'm still unsure whether the generated strays get saved anywhere (get their own character file) or screw up the Sim Creation Index (if last character file in a neighborhood is N001_User0050, and three strays get generated during the CAS lot visit, does the newly created Sim get assigned character file N001_User0051 or N001_User0054 because of the strays?). If neither of those two cases are true, then it truly would help to just delete the portal objects.

@topp
I went ahead and tried it out after strays suddenly started appearing in CAS despite the no stray mod in the folder for some reason...?

Either way, I got rid of both Portal - Pedestrian objects, and left the car portals intact.
My last character file was User00909; I made four Sims and a pet and left the music off during Sim creation.
I heard the ambient wolf/dog noises, but that was it. No actual cat or dog showed up on the lot, or around it. In addition, character files were named 910 through 914 as they should, and there are no stubs that got generated in addition, even during the CAS session (I did monitor it).

So yes, absolutely feasible, and I will keep doing this now each time I am editing the CAS lot in the future.

@LimeyYoshi No stray mod only prevents new strays from generating in your neighborhood, not from appearing on a lot. If your neighborhood already has any strays, nostrayrespawn won't help you - pets that already exist will still be able to spawn on a lot.

Okay, your comment helped me figure out why I had no strays on my previous custom CAS but then they started appearing on my new custom CAS.

My previous CAS was made in an AnyGame that had Seasons disabled but not Pets. There were no neighbourhoods though and the one I edited the CAS lot in was completely empty (no Sims existed in it).
However, when I changed the CAS lot, I put it into a populated n'hood...

Now that I have your mod AND the portals removed from the lot, I can plop down the CAS lot about anywhere now though, so I won't need to worry about that anymore. :D

After reading comments, yeah i had the same problem too about pets appeared in CAS after i edited but what about VisitorController? it can ban all pets like dog, cat, stray and wolves from the lot.

It can, but it would require moving a Sim on the lot, moving them back out, and potentially the stay-things shrub, depending on when you remembered to do that step. Also, do the Visitor Controller settings stick even after moving Sims out? I'm not sure what it modifies.

Visitor Controller has a check to not work in CAS, for some reason.

I can hardly believe this was fixable all this time! Thank you so much for taking the time to make and share this.

NEEDED THIS! AnyGameStarter just Does Not Work for me.

Thank you so much !!! This was loooong needed :D

If I create a CAS room with Seasons enabled and then use it, do I need to use this mod while making the CAS room, or while using it, or during both?

While using it, but it won't hurt during both.