Quote:
Originally Posted by retiredguy123
I have a Carrier thermostat like yours, but I never turn on the dehumidify control. This control will overcool your house to about 3 degrees below the temperature setting, which will make the house too cold. I have never had an issue with high humidity. I have no idea what the Honeywell device is controlling. Hopefully, it is not adding moisture to your house which will work against the dehumidify setting on the Carrier thermostat.
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Something is not right. Dehumidification mode should always maintain temperature at setpoint. The duct heaters should cycle to maintain constant temperature.
Cooling only will not help since relative humidity is based on two factors. The amount of vapor in the air and the dry bulb temperature. The cooling stays on longer so that water vapor is removed in the chill water coil. It also lowers the dry bulb temperature. Reheat brings the dry bulb temperature back to setpoint.
There are several different definitions of humidity. RH is it is the amount of water vapor present in air expressed as a percentage (%RH) of the amount needed to achieve saturation at the same temperature.
Saturation is when the air can not hold any more water vapor at a given temperature and pressure and condensation on surfaces begins.