With the appropriate thermostat, the new heat pump we put in this Winter will dehumidify as well as cool. Basically, it just lowers the fan RPM to make the coils colder, dropping more water out of the air. A thermostat with a humidity sensor (and a couple of more wires to the control board) is need to use the function.
I was told this was a bad practice because it unbalances the system and increases the back pressure. I was doing it more to move air to the family room. The builder screwed up the HVAC big time.
Which is the idea of the HVAC mode above.