Need to define "cool". We put in an attic fan for the garage and roll down shades in the lanai. It got cooler. Probably would not want to live in either, but it helped. To do the lanai right, you need the screens replaced with windows and the A/C installed. Not interested in living in the garage so can was enough. You do have to pay attention to what you store in the garage. Wife put some shoes in the attic. Good thing she has plenty.
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