At my old apartment, only 840 sqft, my electric bill hit over $350 in the summers. Second floor heat trap with shitty windows and two 20 year old air conditioners and ancient appliances. On days with the outside temperature at 100 degrees, I was lucky to keep the inside temperature at 85. I hated that shithole.
I moved in July to a newly renovated apartment in the same complex. Bottom floor. much better windows, new air conditioners, new appliances. Added a washer/dryer to the mix which got used heavily. This summer it hit 100 degrees, I was able to keep it at 65 degrees no problem, and my bill went down to $110.
It also helps that Pennsylvania now has power choice. I was able to drop 25% from my bill just due to new competition from suppliers and not having to automatically get my power from Excelon.