What's the best temp and humidity to hang my harvest in?

what is the best humidity to get a proper dry from my harvest. Also a temp range to stay in.
I have them hanging on a string with all leaves still on, inside a wooden grow box I built. It is pretty dark in there but gets a slight bit of light.
Should I put a fan in there? Or a humidifier
Humidity right now is 36%
Temp is 68 F

They will dry real fast in that low of humidity, mine is around 50 percent and buds take about 7-10 days to dry out. Without a fan in your box keep an eye out for mold!

I dry in average 60 to 70% humidity, 23 degree temps =) usually 7 days drying