I would second the recommendations of Rattlesnake & Romano-type beans for warmer areas. In really hot areas, yardlong beans prosper... but most of them taste much different from common snap beans (I have one, Sierra Madre, which comes close).
In the hottest areas, where regular pole beans languish, hyacinth beans are a good alternative. They are beautiful, sweet-scented pole beans, and are highly productive. The cooked flavor of some that I tasted was very similar to regular snaps. They need to be picked young though, and should not be eaten raw.
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