The radiant heat barrier is better investment if you want to try that first, you don't need to install it on any attic spaces that face north and don't get the sun.
I think our electric company installs it but if you get a quote ask that it not go on the north to save a few $$.
You also can diy at HD for $150-200, simple staple to underside of the roof.
I think the other poster had an undersized fan. They have to lower temps
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