I can't keep it between 20-40 degrees. I have a heater to warm it up but then it gets too warm. So turn on the fans and it gets too cold. Do these not have a auto thermostat? Am I suppose to sit here 24 / 7 adjusting fans?
.... No they do not each have a thermostat and frankly do not need one as their temp is set by the water cooling loop so you just control the temp of the water. That ensures that all the miners run the same temp and makes for a much simpler/lower cost system. I assume you have a radiator w/fan so just connect a thermostat to the system to turn fans on/off (and turn the heater off) at the desired temps. It ain't rocket science...