I live in the Southern Calif desert area. We get hotter than you but you have the humidity on us.
Even with "our" heat, I'd recommend the big Pass. I use the XA100.5 monos and yes they put out some heat so our air conditioning works a little harder for a few months in the Summer and that is just for the hours (maybe 2-6) they are on.
Do you leave your amps on all the time? A nice thing about the Pass is their standby switch. It keep the caps charged with NO heat and draws only a few watts. When I switch the amps on, they sound pretty good right away and get better during the first hour so I don't leave them on 24/7. Their XA.5 amps aren't really limited to their power rating, that's only how much they put out in pure class A. Even the 100.5's may be enough for you (and less heat than the 200.5's).
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