Tried to set ours here to around 20°C (~70°F), but it barely even reaches 23°C (~74°F) even in the middle of the night. I still consider myself lucky being able to run the AC for most of the day though, so I'm not complaining.
Even more so since my AC's thermostat is located just inside the air intake. Perhaps it registers a far lower temperature than the rest of the room. It's easily compensated though by setting the thermostat lower than the target ambient temperature (here, it's 25°C or 77°F), I guess.