Im about to purchase a home and I ahd an inspection done. i was advise that the attic temp was a 130 degrees and the air flow was different temp going to the addition of the house than the other part of the house could poor insulation be the problem or the attic not vented correctly and the ducts not right
I personaly would not buy a solor fan. A ridge vent vents the whole roof not just a circle. Power vents leave hot moist air trapped in the rafter bays.
Ridge vents have no parts to fail, and work 24/7, no matter if the sun is shining or not.