Roof turbine to reduce attic heat?

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No turbines or any sort of ventilation

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This cannot be correct.

My journey through it

I recommend adding them based on my experience

I would say you probably at least have gable vents or ridge vents but I've definitely seen houses without anything. If you don't have either of those two, you definitely need to add ventilation.

When we built in '08, I researched this and some think tank in ATL said definitely ridge and soffit vents, but NO to power fans. Use turbine if you want.

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I have both, ridge and soffit and it's still hot during the summer. Was thinking exhaust fan on a thermostat to kick on and off at a certain temp, like 80 degrees, if that could happen during the summer.

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I posted my thread above, so I won't rehash it all. My hip roof made for short ridge vents. It was always melting hot up there. I added the turbines and its a huge improvement. I left my ridge vents and tested for cross-flow. I could find no evidence of air getting short-cycled between the ridge and turbine vents.

That said, I shied away from anything powered. The thought process is too much "suction" will force cold air to get sucked out of your house if it can't feed enough air through the soffit vents.

I'm of the opinion, the more airflow I can get up there the better. I'm no engineer or expert in thermodynamics. But I imagine it like sitting in a hot car. Cracking windows and a 1" crack in the sunroof will help. Putting a box fan on the sunroof will make a huge difference.

I also followed up by blowing a dozen bags of fiberglass insulation on top of my existing insulation. My house maintains at 71 so far, with WAY less cycling than before.

I put in 2 a few years ago when my AC was struggling to keep up.

Made a massive difference in keeping my house cool.