I am a little north from you, but a retired beekeeper here (George R.) used to keep 200 Carnies with no problem.  Now that was before global warming factored in, though, but my new neighbor is bringing in 20 Russians this year.  I believe Russians are Carni-offshoots and they will probably do just fine.  Or my Italians will eat them alive.  The real problem is not heat.  You can have 1000 colonies here, but there is no place for you to place them as our flow is short (two and a half month max) and there aren't many alfalfa fields, which are invariably baled at 15% bloom except for the rare occasion when the fields are just too wet for the guy to cut.  Thank you for the concern though.  Nothing is easy in agriculture, it seems.

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