About 18000 BTUH. Rule of thumb is 400 sq ft / ton, 1 ton = 12000 BTUH.
its usually about 20 btu's per square foot
No, you will need closer to 3 tons. Especially if it is room where many people assemble, then you`ll need more.
Square feet is two-dimensional. A flat area 20 feet wide by 10 feet deep is 200 square feet. But cubic feet is three-dimensional. Think of a box 12" wide by 12" deep by 12" high. That's a cubic foot. To determine cubic feet, take the width x depth x height (in inches) and divide by 1728.
sorry
Feet
Four tiles are needed.
The room is 144 square feet.
0
186 square feet, 190 to be safe.
144 square feet = 16 square yards.
12' x 12' = 144 square feet
240 square tiles are needed
144 !
13.333 square yards.
About five (4.975) such boxes.
640
A minimum of 144 square feet. Just multiply length by width - the answer is the square footage.