I work from home and have a number of computers that heat up my office so the AC runs quite a bit during the summer.
My highest electric last year was $250 for July. Lowest was $75 in November.
Highest gas was $35 for January, lowest was $19 for August.
Just installed a new AC unit, the radiator fins on the original unit from 99 were all corroded - a blast from the hose and they just fell off. The installer said the old unit was a SEER 10, the new one's SEER 15 so I'm expecting the electric bill to be lower this summer.