What is your room humidty at night? If it is real low the hh will have to be set higher and if it is real high you may not need it at all.
According to the Environmental Protection Agency, the recommended humidity for indoor environments should range between 30% and 50% relative humidity.
Alot of homes have an AC unit that is too small and as a result it runs continuously causing the house to become very dry, (relative humidity below 20%) On the other hand, an AC unit too big doesn't run enough thus causing high humidity levels in the home, (>70%.)