Buying the wrong AC size is a common and expensive mistake. A small AC runs all day and never cools properly, while an oversized AC wastes money. Use this simple guide to find what size AC you need for your room in Pakistan.
AC Size Chart by Room Size
| Room Size (sq ft) | Approx. Room Dimensions | Recommended AC |
|---|---|---|
| Up to 120 | 10 × 12 ft | 0.75 – 1 ton |
| 120 – 180 | 12 × 15 ft | 1 – 1.5 ton |
| 180 – 250 | 15 × 16 ft | 1.5 ton |
| 250 – 350 | 16 × 20 ft | 2 ton |
| 350+ | Large hall | 2 ton or two units |
Factors That Increase the AC Size You Need
- Top floor rooms with direct sun on the roof
- West-facing rooms that get afternoon sun
- Large windows or glass walls
- High ceilings (over 10–11 ft)
- More people regularly in the room
- Kitchens or rooms with heat-producing appliances
- Very hot cities like Jacobabad, Multan, Sukkur and Faisalabad
If two or more of these apply, consider going one size up (for example, 1.5 ton instead of 1 ton).
Tips for Better Cooling and Lower Bills
- Choose an inverter AC; see our inverter vs non-inverter comparison.
- Set the temperature to 26°C and use a ceiling fan.
- Insulate the roof or use heat-reflective paint.
- Close curtains during the day and seal gaps under doors.
- Clean filters every 2–3 weeks in summer.
Frequently Asked Questions (FAQs)
Is 1 ton AC enough for a 12×12 room?
A 12 × 12 ft room is 144 sq ft. A 1-ton AC is usually enough, but go for 1.5 ton if it is on the top floor or gets strong sun.
Does a bigger AC use more electricity?
A bigger AC draws more power, but an undersized AC runs constantly. The right size uses the least energy overall.
Can I run a 1.5 ton AC on solar?
Yes, especially an inverter AC, with a properly sized solar system such as 3kW–5kW.
Conclusion
Match the AC size to your room size and conditions. For most Pakistani bedrooms, a 1.5-ton inverter AC is the safest all-round choice.