I could get some window units, as I do have plenty of windows. It's that electric bill you mentioned - wouldn't be thrilled to see the cost. I do get a nice cross-breeze through the house and have shade to the SW and W, which helps for the hottest part of the day. The fish don't get to experience the cross-breeze though and I know they're stressed.
Maybe someday when I'm older I'll break down and get AC.