A 5-star inverter AC costs more than a basic model and uses less electricity. The shop will tell you it “pays for itself”. Whether it does for you depends on three things: how much more it costs, how many units it saves, and how much you actually run it.
Where the numbers come from
Every AC’s star label shows its units a year: the electricity it uses in a year of typical running. The difference between two labels is the saving, if you use the AC about as much as the label assumes. Multiply by what you pay per unit, from your bill, and you have the yearly saving.
A worked example
Illustrative figures, not any real model:
- Cheaper AC: ₹35,000, 1,100 units a year.
- Efficient AC: ₹45,000, 750 units a year.
- Electricity at ₹7 a unit, rising 3% a year.
The efficient AC saves 350 units, about ₹2,450 a year. Its ₹10,000 extra pays back in 3 years 11 months if you ignore what that money could have earned. Counting interest at 9% a year on the extra price, it takes 7 years. After 10 years, it is ₹3,573 ahead: a gain, but a modest one.
- 50% of the label
- 100% of the label
- 150% of the label
Years from buying
See the numbers
| Years from buying | 50% of the label | 100% of the label | 150% of the label |
|---|---|---|---|
| Today | −₹10,000 | −₹10,000 | −₹10,000 |
| Year 1 | −₹9,713 | −₹8,488 | −₹7,263 |
| Year 2 | −₹9,477 | −₹6,991 | −₹4,504 |
| Year 3 | −₹9,300 | −₹5,514 | −₹1,727 |
| Year 4 | −₹9,189 | −₹4,064 | ₹1,061 |
| Year 5 | −₹9,153 | −₹2,649 | ₹3,854 |
| Year 6 | −₹9,202 | −₹1,278 | ₹6,646 |
| Year 7 | −₹9,346 | ₹41 | ₹9,428 |
| Year 8 | −₹9,596 | ₹1,297 | ₹12,190 |
| Year 9 | −₹9,966 | ₹2,479 | ₹14,923 |
| Year 10 | −₹10,470 | ₹3,573 | ₹17,616 |
₹10,000 extra; 1,100 against 750 units a year on the labels; ₹7 a unit rising 3% a year; 9% interest on the extra price. Above zero, the 5-star AC has paid for itself.
Use decides it
The saving scales with how much you run the AC:
- Heavy use (150% of the label): it saves ₹3,675 a year, pays back in 3 years 8 months counting interest, and is ₹17,616 ahead after 10 years.
- Light use (50% of the label): it never pays back within 10 years, and ends ₹10,470 behind.
| How much you run it | Saves in year 1 | Pays back | After 10 years |
|---|---|---|---|
| 50% of the label | ₹1,225 | Not in 10 years | Behind ₹10,470 |
| 75% of the label | ₹1,838 | Not in 10 years | Behind ₹3,449 |
| 100% of the label | ₹2,450 | 7 years | Ahead ₹3,573 |
| 125% of the label | ₹3,063 | 4 years 9 months | Ahead ₹10,595 |
| 150% of the label | ₹3,675 | 3 years 8 months | Ahead ₹17,616 |
Payback counts 9% a year interest on the extra price.
With these figures, the efficient AC stops paying below about 87% of the label’s use, below about ₹6.11 a unit, or if it costs more than about ₹46,458.
Try it
Your use and your bill
- Saves in the first year
- ₹2,450
- Pays back, counting interest
- 7 years
- Ahead after 10 years
- ₹3,573
Beyond the money
- Comfort. Inverter ACs usually run quieter and hold temperature more steadily.
- Service. A good warranty on the compressor and a service centre near you can matter more than the electricity.
- How long you will stay. Payback only counts if you keep the AC that long.
Put in the two labels you are comparing, your bill’s rate and your honest guess of use in the AC payback calculator.
For education only. Not investment, tax or insurance advice. Examples use the figures stated in the guide; check your own before you act.