Honeywell Thermostat: TH8320R & TH8321R VisionPro
Re: THERMOSTAT OVER-COOLS
With a Honeywell VisionPro or Prestige thermostat, the most common reason for the thermostat to overcool is Dehumidification.
When either thermostat is configured to dehumidify, there is a setup option for "OVER COOL LIMIT" which can be set from 0 to 3 deg.
When the sensed humidity level is higher than the Dehumidify setting, the thermostat will over-run the cooling in an attempt to maintain humidity.
WHAT TO CHECK: If the space temperature is lower than the Cooling Setpoint and the A/C is still operating, check the Dehumidify Mode and setting to see if the thermostat is trying to dehumidify.