Im not sure I understand your question. If you dont have a laser thermometer that can give you an instant temp I would suggest placing your thermometer on the bottom, close door, come back in 10 minutes, note temp. Place thermometer in the middle and repeat. Place the thermometer at the top and repeat. Compare your temps....
My temps.
Bottom shelf against the door
Middle shelf by door
Top shelf by door
I didn't open the door I just pulled the cord out to my premarked spots.
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