Product review (4 stars): I came upon a customer review that gave great advice on improving the temperature
I have bought 3 of these units this past week.  When I unpacked them and plugged them in, all of them struggled to get under 50 degrees overnight.  Upon doing research, I came upon a customer review that gave great advice on improving the temperature.  I will pass this along to you...carefully pull or pry the temperature control knob off.  There is a small set screw to the left of the temperature control knob stem.  Over the last 2 days I have been turning the set screw clockwise to lower the temperature of each unit.  Now all 3 units are maintaining temperatures below 40 degrees.  This is awesome and they are working great!  The only negative I would offer about this cooler would be the wire shelves - they bow/bend when the shelf is full of soft drinks.