700 to 1000
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1800 btus
1 mile = 5280 ft so 18000 ft = 3.409091 miles.
18000 sq ft = 0.41322 acres
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.