We did not need any solar tubes, and after researching solar attic fans, I went with a conventional A/C powered unit with a thermostat. Cost about 1/6th of solar, and moves about 5 to 10 times more air. Also runs until the attic is cool, not until the sun goes down. No roof penetration require was another big point.
Just my thoughts, which when combined with about $3 will get you a good cup of coffee.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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