Air Conditioners4 min readLast reviewed 15 Jul 2026FetchIt Research
1 Ton vs 1.5 Ton AC: Which Size Fits Your Room?
Quick answer
As a rule of thumb, 1 Ton suits rooms up to ~120 sq ft, and 1.5 Ton suits rooms up to ~180 sq ft — go bigger for west-facing or top-floor rooms with more heat load.
Why tonnage matters more than star rating
An undersized AC will run constantly and still struggle to cool, costing more on electricity despite a higher star rating. Getting the tonnage right matters more than chasing an extra star.
Room size guide
| Room size | Recommended tonnage |
|---|---|
| Up to 120 sq ft | 1 Ton |
| 120–180 sq ft | 1.5 Ton |
| 180–250 sq ft | 2 Ton |
Mistakes to avoid
- Undersizing to save on upfront cost
- Ignoring direct sunlight exposure and floor level when estimating heat load
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