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What is AC Size Calculation?

AC size calculation means deciding the correct capacity of an Air Conditioner (in Tons or BTU/hr) for a room, hall, or building.
If the AC is too small → room won’t cool.
If it’s too big → electricity will be wasted and comfort will reduce.


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🔹 Formula (Approximate Rule of Thumb)

👉 1 Ton AC ≈ 12000 BTU/hr ≈ 150 – 180 sq. ft room (normal height, average conditions).

Step by Step:

1. Measure Room Area = Length × Width (in ft²).


2. For every 150–180 sq. ft → 1 Ton AC needed.


3. Adjust for conditions:

+0.5 Ton if room is very sunny / top floor.

+0.5 Ton if many people stay inside.

+0.5–1 Ton for kitchen or heat-generating appliances.


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