Radiant barrier, thermal barrier as the OP calls it (Reflectix brand name) can help on a garage situation, however, when used over the entire home yields limited results. Specifically, you will save 1.5 to 1.8% of your electric bill during the cooling months.
Attic fans, which have already been confused with solar fans, are generally a waste of money. Solar fans, at 900.00, only run at the claimed CFM rating at solar noon and stop working before the attic has cooled. Often this is at 11pm to 2am. You are far better off simply adding additional inexpensive static roof vents.
The vents do extend the roof life, however, the actual replacement schedule will be an economic one. Home owners insurance increases dramatically once the roof is ten years old.
If the OP wants scientific evidence to support my claims, just ask me.
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