I have been waiting all summer to answer this question. This is 1,700 sqft. finished basement that I monitor. There are two occupants in the home 12 hours per day. No fresh air ventilation or dehumidification this week. The basement was <53%RH for the week. The outdoor dew point average <40^F for the week. This is a cool basement without much space heating yet. At higher outdoor dew points, I needed dehumidification.
I posted the data from my Hobo loggers.
WI 50RH Bsmnt No dehu.pdf