Around a million. plus or minus a few.
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10 ft x 20 ft room = 200 square feet
200 yd = 600 ft
It will take 300000 btus at 12000 a ton and a ton of air will be 400 sq feet so. 10000 sq ft divided by 400 is 25 tons of air then multiply 25 times 12000 btus and you get 300000
200 ft * 900 ft = 4.13 acres (to 2 dp).
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.