Recommended:

http://www.consumerreports.org/air-conditioners/best-setting-for-central-air-conditioning/

78° F when you’re at home.
85° F when you’re at work or away.
82° F when you’re sleeping.
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As for my own use, room and air conditioner:

75° to 77° F when I am at home.
85° F or off when I am at work or away.
79° to 80° F when I am sleeping.

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http://www.bounceenergy.com/blog/2013/07/home-temperature-air-conditioner-summer/

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Try:

72° to 79° F when you’re at home.
80° to 90° F or off when you’re at work or away.
77° to 82° F when you’re sleeping.