This has been extensively studied in several university papers and the end result was that any type of power roof fan system draws moisture and reduces the living space energy efficiency. The entire roof underside is foamed which results in a sealed envelope which also insulates the living space below attic. No gable vents, no soffit vents, the entire roof becomes a moisture and temperature barrier for the house below. Cooling costs are reduced also for the entire structure including 2 story homes.Colt Carson said:… my attic uses a powered fan at the very top of the roof to exhaust the hot attic air. ..
Have done several homes with this method in tropical climates.
As for termites, they are always present, if not in your home, then down the street with a neighbor or public building(s). That is why we unconditionally tent each building about every decade at a simple cost of about 1k per building. It also clears other critters