In almost all residential scenarios, it is significantly cheaper and more energy-efficient to let your air conditioner run steadily at a comfortable temperature all day rather than turning it completely off when you leave and back on when you return. When you shut an AC off entirely, your home gains massive amounts of heat, forcing the system to work at maximum capacity for hours to cool the building down, which consumes more energy than maintaining a steady baseline. However, utilizing a programmable or smart thermostat to raise the temperature by 5 to 7 degrees while you are away offers optimal energy savings.
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