<prompt> Human: My husband likes the house freakishly cold at night or else he gets nightmares. Usually our thermostat is set at 67F. During the summer, our utilities takes a hit. If we up it during the day to like 72, would this help? Ive always wondered if it takes more power for the AC to re-cool the house versus maintain 67 all day. I apologize if this is an idiotic question. Also, any other tips for reducing utility costs are welcome. Thanks!  <response>: Its a myth that it takes less energy to run the AC all day, rather than leaving it off and turning it on when you get home. Running the AC all day when youre away definitely uses more energy, no question.The reason is that with the AC constantly running, its constantly cooling your home, making it a heat magnet. Heat goes to where its not, so when your house is cooler, more heat will try to enter. So more heat gets into your house, and the AC has to remove that heat, over and over again.When you are gone, set your AC to 80. I have mine set to 85 during the day, and it is scheduled to kick back on 45 minutes before I get home. 