AC size guide
20x20 Room AC Size
Most 20x20 ft (400 sq ft) rooms need a 3 x 2 ton AC. Pick VRF or ducted system if the room faces west or is on the top floor.
Size for your type of room
| Room type | Cooling load | AC size |
|---|---|---|
| Shaded room, lower or middle floor | 48,424 BTU/h | 3 x 2 ton |
| Normal sun, middle floor | 53,224 BTU/h | 3 x 2 ton |
| West-facing or top floor | 63,544 BTU/h | VRF or ducted system |
One split AC is not enough here
For this size, use two or more split ACs, cassette ACs, or a VRF system. Cooling comes out more even and you can switch off part of the room.
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
400 sq ft · approx 3 × 2.0 Ton ACs
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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.
Commercial projects team (VRF, offices, shops)
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Common questions
›How many ton AC for a 20x20 room?
Most 20x20 ft (400 sq ft) rooms need a 3 x 2 ton AC. Pick VRF or ducted system if the room faces west or is on the top floor.
›20 by 20 room me kitne ton ka AC lagega?
Normal dhoop aur beech ki manzil par 3 x 2 ton ka AC. Top floor ya west-facing room me VRF or ducted system lein.
›Is a bigger AC better?
No. An oversized AC switches on and off often, removes less humidity and wastes power. Buy the right size.