The service manual is
here
From
here there is this on ambient temp:
Ambient Temperature: The cooling system of your wine cabinet has the ability to cool a maximum of 25 degrees below the ambient temperature in the room. Therefore, you want to place the unit in a room which will not exceed 78 degrees. Otherwise, the unit will not have the capacity to keep the wine at a desirable 55 degrees. On the other hand, you want to make sure the temperature in the room does not fall much below 55 degrees. The unit only has the capacity to cool the wine inside and cannot exceed the ambient temperature of the room. In addition, the unit is designed only to cool to a minimum temperature of 50 degrees.