I can confirm that the A/C copes very well with the heat in the Perth metro area. This past Summer I had mine set to 24, which I found comfortable on all but the hottest of days. When it was stiflingly hot, I lowered the temperature to 23. Any less than that I find too cold in the cabin. On starting the car in the afternoon, the A/C always blasted out as it tried to cool the cabin, then the fan would gradually reduce in level to around two of the fan-speed indicator bars. In the car park at work I always keep the windows lowered a small amount to prevent the cabin from getting too hot, and I have one of those reflective sunblinds that sits inside the windscreen.
Incidentally, external sunblinds are a better option as they prevent the sun from getting onto the glass in the first place.
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