The required tons of AC for installation differs based on the factors like the area of the room and the cooling requirement. The approximate tons of AC required based on the area are listed,
AC required for 120 sq ft- 1 ton
AC required for 170 sq ft- 1.5 ton
AC required for 250 sq ft- 2 ton
AC required for 300 sq ft- 2.5 ton
AC required for 400 sq ft- 3.5 ton