We've written before about how to cut back on the costs of utilities. Until now we have ignored one huge option. If you have central air, you can control the settings. You can decide if you want the AC to be at 72 during the day, but go to 74 at night because it's cooler. Or maybe no one is home during the day and t doesn't matter if it's set at 75 from 9am to 6pm. 
Utilizing these control functions on your central air can cut down costs dramatically. Be careful, though, our AC randomly resets itself to 85 degrees sometimes. Not fun to come home to.
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