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The programable thermostate is a good choice.
Change the filters on the cold air returns, and have an A/C guy come out and top off the freon charge. (makes them mor efficient). Have him inspect the cleanliness of the coiling coil.
I would think that any properly sized system would not run constantly when set to 86. But 90 during the day and 86 at night should keep it dry and not cost you an arm and a leg.
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