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I'd re-think the insulation. Since I got the attic insulated, I can open windows at night and cool the place down, then close them in the morning, and even on a 100 degree day it will stay below 70 until 5 or so. Of course this is in northern Nevada, where it usually drops below 60 at night even on the hottest days. May not do as well in more humid areas. But even so, your ground-source A/C wouldn't have to work nearly as hard.
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