[jyl]

I've read about people putting air circulation systems in their homes. Basically a duct and fan, moving air from top floor to basement, runs intermittently on a timer.

You guys have separate a/c systems for upstairs and downstairs? That must be a TX/South thing, I've never had that. We have terribly ineffective a/c on the upper floors, but it is because of the difficulty of fitting central heat/air ducts into an old house.