I had a bit too high expectations on the device. I came out of an automatic fan, which regulates to a predetermined target temperature. The is not quite like that. The unit will beep if a penetrant temperature limit is exceeded and then regulates the fan on maximum. It would make sense, in my opinion, if it were possible to ask all fans to maximum is exceeded in order to eliminate heat buildup. But I have not yet found a control which has this setting. Unlike the other reviews, the temperature sensors keep quite well for me. Temperatures could get there to + -5 degrees. What would appear adequate for me.