How well does purple leaf heuchera do in full sun in areas with hot summer?

I have read that it does okay in full sun, actually prefers it, but then I have also read that if it is very hot in the summer, that the leaves get damaged .

Anyone with sure knowledge about this through experience?

I am in southern part of zone 6

Thanks for your answers!

p.s. which kind of heuchera would be green during the summer but turn a nice color over the colder months and still be evergreen?

and which types of soil do they prefer?

Would they go well with astilbe interplanted ?

Thanks for your answers!

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