In Scotts book he talks about drying roots in a drying room with lots of shelved screens in place and in that room he has a wood stove out in the middle of the room and the screens are around the edge of the room.
He said that when he brings fresh washed roots into the room he will build a fire and heat the room up to around 90 degrees but that is the MAX he will let it get to. If it starts getting hotter than that he opens windows to cool is off.
He said that initial 90 degree period only last 12 hours and then he trys to maintain a temp of around 70 degrees in the room.
He did say that on cool damp mornings he would fire up the stove again and heat it back up for a few hours to help combat the moisture in the air.
His room was probably not like what we have today in a modern home - basically air tight, insulated well, HVAC system air space with basically no moisture issues.
I don't use any heat when drying mine - just let them air dry in HVAC system air space 72/73 degrees and they dry perfectly, nice color, nice shape, the wrinkles you want.
If I needed to dry some faster for some reason - I would consider buying a little space heater, and possibly a de-humidifier and a fan and include those in my drying room but I would keep the heater out away from the seng so that it was not blasting heat directly on the seng - but just warming up that room a bit (say up in the 80-85 degree range). A little extra heat and air circulation from the fan and a de-humidifier and you would have some ideal drying conditions.