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Scenario: one fairly large office room, open area about 70' x 40'. With 10-15 people on average. Using the ~400 btu/hr per person figure less than 1 ton of cooling required to deal with just people. I also estimate less than 1/2 ton of cooling for computers/laptops/tv's and one full size refrigerator. And heat load from sun during the day is minimal.
What would happen if this one room, occupied only from 7a-6p and cooled by a single unit, is done with a unit rated at say 30 tons ? I figure 5 tons is needed at most under worst heat load conditions.