Will insulating my attic make a noticeable difference?
Yes it will make a noticeable difference, but I'd be hard-pressed to do that on a place I was renting. With free natural gas, I'd be tempted to get a NG generator and run bigger A/Cs. I'm surprised you need AC that bad in central WV. I grew up in southern WV w/o AC--and never really needed it up in the mountains... Good luck.