Out door dew point determines inside dew point
Unoccupied home in FL is wet (+55%RH) or dry depending depending on the outdoor dew point.
The a/c is off and the home is unoccupied. Following quickly indicates an air change in 3-5 hours. Adding occupants raises the indoor humidity. Raising the indoor temperature lowers the indoor %RH. Significant cooling lowers %RH. Ultrimate control of the indoor %RH requires a good dehumidifier. Second graph shows same house occupied and dehumidified