Found my answer from High Times January 2013 - Wax On, Making Soleventless hash the Nikka T way Story by Ry Prichard
Nikka T on the subject of Drying temp and humidity.
"Also, Keep temperatures in the drying area between 40F and 68F depending on how quickly you want to remove the water (which will vary according to strain), and keep the relative humidity between 15 and 50 percent. there are certain strains were I like to keep the humidity and temps on the higher end of that range to create the appearance desired by the patient or client...." - Nikka T