Several "heat tolerant" varieties I've tried, a few mentioned in this thread - but every single one of them mentioned will eventually poop out severely in a typical Texas summer.
The most heat tolerant variety I've ever grown is Sweet Quartz F1, hands down. Second place might be Sungold, or perhaps Sweet Million (also both cherry type hybrids.) However, even those two eventually experience a major drop off in both production and size of fruits when it gets and stays really hot here.
Another one (besides Sweet Quartz) that will set like crazy in extreme heat is Coyote, but I just don't care for the taste at all.
Purple Haze F1 is worth an honorable mention. I love the flavor, and it does slow down a bit in my summers, but it will at least continue to produce a little if I can keep the plants healthy. I happened upon an F2 PH this year that gave me similar results, both for taste and for production in very hot and humid weather.
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