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I don't believe it is good practice to shift temperatures to save a little. I think this is hard on the A/C unit.
I don't think it hurts it. The worst thing for A/C units is rapid on/off cycling and modern electronic thermostats prevent that. A/C units work more efficiently under certain conditions, such as the moderate outdoor temperatures at night. Keeping the house at a constant temperature means that the A/C unit must work longer and less efficiently than if it was set back during the day and run more at night. Many people are more comfortable with a slightly cooler temperature at night than during the day. That doesn't even take into account the savings gained from setting the A/C back during the day or TOU pricing.
 
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