I checked out fans at Home-Depot today. They have three GAF Master Flow fans: pr1 1000 cfpm, 1600 sq. ft., $49.95, pr2 1250 cfpm, 2400 sq. ft., $67.95, pr3 1600 cfpm, 3200 sg. ft., $89.95
I also looked at white elastomeric roof coatings. Kool Seal #63-300 Energy saving up to 35%, reflects 90%+ $12.79. I think that the Kool seal sound like a good idea. I would need 3 or 4 gallons just for above the equipment room.
I don’t know when you have upgraded this but the price on attic fans appears to be outdated as i cannot find them at those prices