Picking an under-sized AC means it never quite cools the room — and runs constantly trying. Over-sized means short cycles, humidity left in the air, and a bigger electricity bill. Here is a fast way to size yours right.
The 600-rule
For typical Pakistani conditions (insulation, west-facing walls, single-glazed windows) a usable rule of thumb is 600 BTU per square foot. A 12,000 BTU unit (1.0 ton) handles ~120–150 sq ft. A 1.5 ton (18,000 BTU) handles ~180–230 sq ft. A 2.0 ton (24,000 BTU) handles ~250–320 sq ft.
Adjustments
- Top-floor / west-facing room: add ~15%
- Kitchen attached or many appliances: add ~10–15%
- More than 3 occupants regularly: add ~10%
When in doubt, ask
If you are unsure, share your room dimensions on our quote form and our team will recommend the right unit and explain why.