I think @Toymeister said it best. I will add to answer the OPs question, it is NOT necessary to poke a hole in the roof to add attic ventilation. Our garage fan blows it's garage hot air into the attic which then exhausts through the venting along the edges of the roof and a couple long vents at the crown.
We had Solar Guys (?) put in a garage fan and insulate the garage door. They did an excellent job, and a reasonable price. It works. But, it does not get the garage COOL. It keeps it from getting unbearably hot. If it is in the high 90's outside and a bright sun shiny day, the garage will still get close to 90.
My BIG concern, that I did not think of at the time, if the garage fan creates a vacuum in the garage, which you can feel when you open the door into the house. I am concerned that when it is running, that low pressure is pulling some of the house AC cooled air out. I am probably going to put a few more vents on the garage door in an attempt to reduce the low pressure.
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