Python scripts?

[gkusiak]

No, I meant to ask this of xbian people, @Nachteule: what's the best way to control a cooling fan for a Pi4 xbian build, so that the fan turns on when the Pi heats up, and stays on until it has reached an acceptable idle temp?
Is this beyond the scope of this forum? Sorry, I'm still very new. I know dev's are working hard, but surely I'm not the only person concerned with this.