AC size guide
15x15 Room AC Size
A 15x15 ft (225 sq ft) room needs a 2.5 ton AC.
Size for your type of room
| Room type | Cooling load | AC size |
|---|---|---|
| Shaded room, lower or middle floor | 27,274 BTU/h | 2.5 ton |
| Normal sun, middle floor | 29,974 BTU/h | 2.5 ton |
| West-facing or top floor | 35,779 BTU/h | 2.5 ton |
Monthly bill for a 2.5 ton AC
At 8 hours a day and ₹6 per unit (Gujarat higher slab). Change the numbers in the calculator below.
| AC type | Units per hour | Per month |
|---|---|---|
| 5-star inverter | 1.75 | ₹2,520 |
| 3-star inverter | 2.13 | ₹3,060 |
| 3-star non-inverter | 2.50 | ₹3,600 |
Check your exact room
The calculator is filled with this room size. Add ceiling height, sun, floor and people for your exact answer.
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Live estimate
225 sq ft · approx 2.5 Ton
Calculate for cost & models
Fine-tune: sunlight, floor, ceiling height, occupancy▾
What changes the size
- Afternoon sun on a west wall can add 10 to 15%.
- A top floor under a concrete roof adds about 10%.
- Each extra person adds about 600 BTU/h.
- A ceiling above 10 ft adds about 10% per foot.
- A kitchen or many electronics add 1,000 to 3,400 BTU/h.
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Common questions
›How many ton AC for a 15x15 room?
A 15x15 ft (225 sq ft) room needs a 2.5 ton AC.
›What is the monthly bill for a 2.5 ton AC in this room?
About ₹2,520 a month for a 5-star inverter AC, at 8 hours a day and ₹6 per unit.
›15 by 15 room me kitne ton ka AC lagega?
15 by 15 (225 sq ft) ke room me 2.5 ton ka AC sahi rahega.
›Is a bigger AC better?
No. An oversized AC switches on and off often, removes less humidity and wastes power. Buy the right size.