A blue white fire for eternity would indeed be hot.
And yet. Did you get a lookie at that sea of glass (molten, obviously, to be a sea) mixed with fire?
You notice that nobody in heaven is complaining?
They can take the heat there. That’s why.
God is a hot property. It’s hell, trying to chill out the Spirit, that can’t stand His fiery presence. Kind of counterintuitive, because elevated temperatures spell our doom here. But we don’t have, yet whatever it was that the Angel (Jesus preincarnate?) gave to the men who survived Nebuchadnezzar’s furnace.