Square feet means nothing by itself.
You also need to have the height in order to obtain the volume.
Then you also need:
required working temperature,
insulation type and thickness,
type and quantity of product to be kept in cold room,
how often and at what temperature new product gets put into the room.
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According to the Energy Star chart, 12,000 BTUs will cool a room of 450 up to 550 square feet. I'd stay on the low end of that.
Around a million. plus or minus a few.
It will cool approx 550 sq feet, depending on amount of direct sunlight in room and amount of people in room being cooled.
5
14,000