I prefer an electric attic fan. They will have a temperature setting at the fan for when it should turn on and off. Some have a humidity setting also. I wired a switch to mine up North so if it was going to be an especially hot day I could manually turn it on before the heat built up in the attic. Open the attic stair access 6 or 8 inches and crack a window or gragage door to draw the heat out of the garage. I am wondering if an electrical device on the roof of my house will act as a lightning rod. A third alternative is a whole house fan in the garage ceiling exhausting into the attic which is probably a bad idea because if it is too powerful it could force air out the soffitt vents and potentually clog then with insulation.
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