Your thermostat measures temperature only, but comfort in Southwest Louisiana is a humidity verdict: 76 degrees at 65% indoor humidity feels worse than 78 at 50%. AC removes moisture only while it runs, and it runs only until the temperature set point is satisfied - which is why a house can be 'cool' and clammy at the same time.
The three levers, in order of cost: runtime (correct sizing and fan settings keep the coil working longer per cycle), airflow (a slower blower across a cold coil wrings out more water), and dedicated dehumidification (a whole-home unit for houses whose envelope or occupancy loads moisture faster than any AC cycle can remove it).
Target: indoor relative humidity between 45-55% through the summer. A $20 hygrometer on the wall tells you more about your AC's real performance than the thermostat ever will.
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