Defaults reflect this space type, including its typical equipment/metabolic load of ~500 BTU/hr. Same engine as the main calculator.
| Cooling load | — |
A classroom is the purest occupancy-driven load: 30 students at ~600 BTU each is ~17,000 BTU/hr of people — typically more than the entire envelope load of the room. This is why the common Indian coaching-centre answer is two 2T splits for a 400 sq ft room that would take a single 1.5T as a bedroom.
Thirty people also exhale: without fresh-air exchange, CO₂ climbs past 1,500 ppm within a period and attention measurably drops. Recirculating splits don't ventilate — pair them with exhaust/fresh-air provision, and accept that ventilation air adds load (the estimate's occupant count carries most of it).
A typical classroom / coaching centre (~400 sq ft) needs about 29,860 BTU/hr — a 2.5 ton unit in moderate US conditions, or two split units in hot Indian conditions (57,700 BTU/hr).
A typical Indian classroom / coaching centre of ~400 sq ft carries roughly 57,700 BTU/hr in hot conditions — a two split units. Adjust with the calculator above for your exact room and city.
Typically two 2T splits for a ~400 sq ft room — about 4 tons total, two-thirds of it pure occupant load. One unit per side gives even coverage and redundancy during board-exam season.
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