Defaults reflect this space type, including its typical equipment/metabolic load of ~800 BTU/hr. Same engine as the main calculator.
| Cooling load | — |
A 90 sq ft study with one occupant and a laptop carries one of the lightest loads in the house — and it's where India's 0.75T size and the US 5,000–6,000 BTU window class earn their keep. Buying 1.5T 'to be safe' here produces textbook short-cycling: the room hits setpoint in four minutes and turns into a damp refrigerator.
Small rooms are sensitive to boundary changes: leave the door open and the AC suddenly serves the corridor too. Either size for the closed room and keep it closed, or include the connected area honestly. The 5% borderline logic in our calculators matters most at these small sizes, where one step is a 33% capacity jump.
A typical study / small room (~90 sq ft) needs about 3,780 BTU/hr — a 1.5 ton unit in moderate US conditions, or 1 ton in hot Indian conditions (10,080 BTU/hr).
A typical Indian study / small room of ~90 sq ft carries roughly 10,080 BTU/hr in hot conditions — a 1 ton. Adjust with the calculator above for your exact room and city.
For a closed 80–100 sq ft mid-floor room in most Indian cities, yes — and it will dehumidify better than an idling 1.5T. Step up only for top floors, hot-dry afternoons, or doors that stay open.
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Go deeper: Main tonnage calculator · all guides.