Assume you do not have a separate humidifier. I would use 80 from say 6am to 12 midnight. Then say 70 from midnight to 6am. The idea is to dehumidify the home with the night setting.
Try it for a night and see what it does for your homes humidity.
My experience is that the home is usually over 60% in the summer with the temp set at about 76. I use a separate dehumidifier to keep it under 60%
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