Good freeze, low power consumption

I have the deep coolness are in an unheated room on the ground floor -> lumber room. Unfortunately I have what the size of the unit goes miscalculated, I do not get it, unfortunately in the basement, which is the door to close. The interior is really big here a lot goes in, in relation to the size.

The power consumption is measured with a gauge, the chest stands at level 3 out of 5, I came in a month to 10.5 KwH which coincides approximately with the manufacturer's instructions. These are inside -17 degrees Celsius.

I am satisfied with the device. The power consumption would probably be even better if the chest would be in an even cooler room.