I live in AZ, is the AC on 964's capable of handling the extreme heat in the summers? are there upgrades available?

 

FWIW, while Northern Virginia has its fair share of 100 degree days it's nowhere near as many as Arizona, but my 964's a/c keeps up. It doesn't freeze me out (my truck will do that!) but I can be comfortable in high temps with the a/c on.

 

The 964 AC is pretty good.