How much can 1 ton of ac unit cool the area in cubic feet?

As a rule of thumb (HVAC Equations Data and Rules of Thumb2nd Ed)

offices, commercial: : sq. ft / ton 

Banks court houses: : sq. ft / ton 

police station post office : : sq. ft / ton 

Restaurant: : sq. ft / ton 

Kitchen: : sq. ft / ton 

Hospitals: : sq. ft / ton 

Residential: : sq. ft / ton

 Apartment: : sq. ft / ton 

School: : sq. ft / ton 

library & museum: : sq. ft / ton 

malls: : sq. ft / ton

This role of thumb may be not applicable for KSA or AUE 

in KSA  we may use the following

- m2/ton for office and normal working area

- m2/Ton for public gathering area\\\\ food court

- m2 /Ton for mosque theater auditorium etc