Depends on the water that ur toilet gets. They usually hook up to the toilet reservoir intake (I don’t know the actual word for this, it’s just the backrest part). All the bidets I’ve used have been fine, I haven’t had any thatre like too hot or too cold then again, unlike Goldilocks, I’m not too picky ab temperature.

I actually don’t mind it, especially in the summer. You can get heated ones that cost more. Maybe my anus isn’t that temperature sensitive?