AC size guide
450 sq ft Room AC Size
Most 450 sq ft rooms need a VRF or ducted system AC. A shaded room can use 3 x 2 ton.
Size for your type of room
| Room type | Cooling load | AC size |
|---|---|---|
| Shaded room, lower or middle floor | 54,724 BTU/h | 3 x 2 ton |
| Normal sun, middle floor | 60,124 BTU/h | VRF or ducted system |
| West-facing or top floor | 71,734 BTU/h | VRF or ducted system |
Common shapes with this area: 15x30, 18x25 ft.
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
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Live estimate
450 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 450 sq ft room?
Most 450 sq ft rooms need a VRF or ducted system AC. A shaded room can use 3 x 2 ton.
›18 by 25 room me kitne ton ka AC lagega?
Normal dhoop aur beech ki manzil par VRF or ducted system ka AC. Chhaon wale room me 3 x 2 ton kaafi hai.
›Is a bigger AC better?
No. An oversized AC switches on and off often, removes less humidity and wastes power. Buy the right size.