Product review (5 stars): Having some issues - Not any more
I am using this to keep the temperature normal(35-40 degrees) on my deep freeze freezer.  For some reason (even when the door is kept close) this thing will get anywhere from 40 degrees to 20 degrees without changing the dial or opening the door.  It almost completely froze my keg because the temperature dropped so drastically.  I have the thermostat set to 40, and temp gauge is in the middle of my freezer with a freezer thermostat right next to it.  Is anyone else having an issue with this if so were you able to resolve it?  I noticed that one guy put his in a class of water, i might give that a try.

**UPDATE**
I finally got my temperature regulated in my freezer and every time i check my freezer it is sitting perfectly at 38 degrees.  I figured out what the issue was.  My freezer was not turned to the coldest setting and was having an issue keeping up.  After I read the directions and figured it out it now works perfectly.