Are you on a foundation or do you have a crawl space? Check into spray foam insulation. I think they can spray down into existing walls now. That stuff is amazing. Put more insulation in the attic. Old windows can let a lot of air out as well.
Sitting on a full basement. I may look into adding some insulation to the attic. We've got that fluffy, loose stuff that kinda looks like the polyfill you'd find in a stuffed animal. The windows are 12 years old. Would that be considered "old" for purposes of energy efficiency/ AC effectiveness?
