In the summer, a dry and cool effect is more desirable. Using a ceiling fan could reduce cooling costs by allowing you to raise the setting of the thermostat or use it in place of air conditioning. I maintain that it is strictly a matter of the temperature setting, and that the air conditioner will kick in only when the temperature exceeds the thermostat setting. The air conditioner is controlled by the thermostat. If there is a humidity control adjacent to the thermostat, it controls a furnace-mounted humidifier.
Comfort is a combination of temperature and humidity conditions.
Air conditioners are also dehumidifiers and control both air temperature and humidity level. The idea of controlling an air conditioner by humidity level is a good one. Some new air conditioners, with variable speed or two speed compressors, are designed to be able to operate in this manner. They dehumidify the air without a major investment in cooling the air. This type of equipment can provide comfort at a lower expense than a traditional air conditioner.