Ditto what everybody else has said. I have mine set at 1 with the probe hanging close to the carboy. I've got it set to 52 for a lager primary right now. The freezer probably kicks for a minute or so once or twice every hour in my 70 degree basement. If you are worried about the fridge turning off and on a lot, use the Anti-short cycle (AsD) setting. You can use this to set a minimum time between cycles. I have mine set to 5 minutes, meaning after the freezer turns off, at least 5 minutes have to go by before it'll kick back on, regardless of temp.