Am I asking something 'wrong'? I can't believe NO ONE has had decent success or dismal failure that can be directly related to heat.

Bag seed does pretty well in the heat I'm dealing with although I'm sure it could be better. Something 'special' surely holds up in indoor Arizona/New Mexico grows with a bit of a heat issue... I'm ready to order a few seeds, but don't want to order blindly if I can help it.