I grew up in Los Angeles, and moved to DFW from Seattle, I'm solar powered, while houston is a little too hot for me, DFW is quite pleasant. As it turns out I'm solar powered, I'd love to go back to Los Angeles, but I'll never be able to afford it again.
But DFW is hotter than Houston? Houston is more humid and can sometimes feel warmer, but DFW is typically 5-15 degrees hotter on the same day in Houston, and the heat there is comparatively bone dry.
As someone who grew up in Los Angeles (California; it's a dry heat) it's a drier heat and not as bad to be out in. I do the state fair every year and hardly notice the temp.