This isn’t entirely a problem with your thermostat. If it’s 26C and humid, all your thermostat can do is to call for cooling. (Maybe it can call for stage 1 or

This isn’t entirely a problem with your thermostat. If it’s 26C and humid, all your thermostat can do is to call for cooling. (Maybe it can call for stage 1 or stage 2. You are unlikely to have anything that can do stand-alone dehumification.) So it can’t actually achieve a comfortable and efficient target.