In the polar regions of the Sun where the surface temperatures might be lower....
/jk
On a serious note scientists have long been able to measure that the sun has a large amount of energy available to any possible inhabitants. Until we understood enough physics around plasmas and the composition of stars it makes perfect sense to hypothesise the existence of creatures/life that would be able to utilise that energy for their own version of high temperature life. To be clear, I think that the extreme conditions in every part of the Sun preclude any possibility of life or life like processes.