Originally Posted by LAXtoDEN

You ready? The hottest day in Phoenix was June 26th, 1990. It was recorded at 122 degrees Fahrenheit.

APU max operation Temp: 52 degrees Celsius/125.6 degrees Fahrenheit.

175 has a few max temps, but mostly cold temperature limitations. None that would create an issue from an operational standpoint in Phoenix.

Unless you’re referring to some potential performance issues in hot weather? Single engine climb gradient issues? It does have a tendency to climb like a dog in the summer.