We had an unusual size space for a refrigerator. 24 inches is the typical and the next lowest one was 15 inches.This 20 inch under counter built-in was perfect for our situation. Seems to be cooling very well, and provided much needed space for our main fridge.  I would change it to be able to cool below 41, like 38 would be ideal, but I'm not seeing a big diffeeence in the way my beer tastes.