Only R13 in the walls with 1/2" sheathing and 5/8 wood siding. 2' overhangs helps with the sun, only the back wall heats up in the afternoon but I'm adding a wash room and porch back there that will help that. R30 in the ceiling keeps the attic heat up there where it belongs. 12kbtu a/c in the wall has no problems at all keeping it cool inside. Only two windows helps too.
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