My wife and I were just looking at homes and notice there was no insulation over the garage space in the Villa we looked at. (this is common in new construction) If you can access the space, have insulation added, at least a R-30 rating, over the garage, and you should notice a hugh difference. After the insulation, consider adding a supply air register to add a little conditioned air (air conditioning) to the garage. Sometimes, if the air handler is in the garage, a supply grill can be added in the duct work, with little effort. Don't leave the supply open fully, or you could effect the supply air balance, (the amount of conditioned air needed in each room of your home.) Hope this helps to cool you down.
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