Why can't we use APU bleed air for wing anti ice on the A320?
On multiple PPRUNE threads they incorrectly say:


  The APU bleed is much cooler than the engine bleed system, and would be ineffective for WAI.


But the reason is:


  The APU bleed temperature is unregulated and thus could damage the wing slats if used for anti-ice.




Highlight shows regulation of engine bleed temperature.