My understanding of most Carrier thermostats is that if you set the thermostat to 80 degrees, and turn OFF the humidity feature, the AC unit will run to maintain a temperature of 80 degrees and then shut off. If you set the thermostat to 80 degrees, and turn ON the humidity feature, the AC unit will still run to maintain a temperature of 80 degrees. BUT, when the humidity level in the house is higher than the humidity feature setting, the AC will continue to run and will "overcool" the house to about 3 degrees lower than the thermostat setting, or 77 degrees. So, the house will only be cooled to 77 degrees when you have a high humidity situation. When the humidity is low, the house will be maintained at 80 degrees and never go below that temperature. The humidity feature is a compromise feature that allows you to save energy by using a higher than ideal thermostat setting, while still maintaining some level of humidity control. I would only use the humidity feature when the house is going to be vacant.
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