Yes, a 4.5 ton air conditioner would be the minimum size for 2000 square feet.
about 75000 btu
Depends where you live, the old rule of thumb is 500 square feet for 1 ton.
One ton per 1000 sq ft.
acdirect.com has a sizing chart- go to the site and determine the zone you live in... it's easy.
986,532,940,800 square feet.
40,000 square feet
The size of the area that a portable air conditioner will keep cool varies depending upon the number of BTU's the unit has. For example, a 12000 BTU air conditioner will cool an area between about 500-600 square feet while a 8000 BTU air conditioner will cool an area of approximately 300-350 square feet.
If it's a square room then the room size is 14 feet by 14 feet
Illinois comprises about 1.6 trillion square feet.(1,614,661,171,200 square feet)
The size of china in square feet is about 2 million feet.
12000btu hr