there are a lot better ways to cool attic than installing solar fans and cheaper. You can buy an attic roof fan from Home depot for around 100 dollars and have a handy man or roofer install it
also vents in garage door would be very helpfull to have a good air flow thru the garage and into the attic thru a vent in the garage ceiling

as has been mentioned before, the ceiling vents may have insurance implications, because they affect the integrity of the fire rated ceiling in the garage. Just sayin

"The Solar Guys" out on 441/27. They advertise in the paper , phone books, etc Good Luck with your move

Here is a GREAT article advising against using either solar or powered attic ventilators (not to be confused with a whole house attic fan).

Fans in the Attic: Do They Help or Do They Hurt? | GreenBuildingAdvisor.com

Here is another interesting article.....
Don't Let Your Attic Suck | The ASHI Reporter | Inspection News & Views from the American Society of Home Inspectors

This is a controversial subject, with folks feeling strongly on both sides. I just suggest doing your homework. I have nothing to gain either way of course, but it is a question I get asked about on a regular basis.

Frank

I was heard a salesman quote a customer , 799 per unit... This was a couple of weeks ago. Was 849 but was on sale for the 799 price.

This is really a great article . Tells you everything you need to know about attic fans.