The AC star rating on the BEE energy label indicates one important thing: how much electricity the unit uses compared to other ACs of the same size. More stars always mean less power consumption. A 5-star split AC uses about 35-40% less electricity than a 1-star model of the same tonnage. With typical Indian electricity rates of ₹6 to 8 per unit, this can save you ₹2,000 to 4,000 each year. The rating is based on the ISEER (Indian Seasonal Energy Efficiency Ratio), which you can find on every BEE label along with the annual kWh estimate.
In this blog, Onida explains what the star rating on an AC means, how to read the BEE label before you buy, what the ISEER rating in AC measures, and whether to choose a 3-star or 5-star AC based on your budget and needs. All numbers are based on BEE-published data and confirmed Onida product specifications.
The BEE star rating is an energy-efficiency label required by the Bureau of Energy Efficiency (BEE) under the Ministry of Power. Every split AC sold in India since 2018 must have this label. The label displays five pieces of information: the brand and model name, the star rating (1-5), the ISEER value, the estimated annual electricity consumption in kWh, and the label validity period. BEE introduced ISEER in 2018 to replace the older EER system, which only tested AC performance at one temperature of 35°C.
ISEER tests performance from 24°C to 43°C, reflecting conditions in 54 Indian cities. Since about 65% of the year in these cities has temperatures above 24°C, ISEER offers a much better prediction of your actual electricity bill than the old EER method. The kWh/year figure on the label is calculated based on 1,600 hours of operation per year. Use it to compare models directly; a lower kWh always means lower running costs.
Reading a BEE label on an AC takes less than a minute once you know what to look for. The label is usually on the front panel of the indoor unit or printed on the packaging. Here’s what each part indicates:
Always compare the ISEER number directly, not just the star band. A 2026-labelled 4-star AC with an ISEER of 5.2 is more efficient than a 2022-labelled 5-star AC with an ISEER of 5.0. The AC didn't get worse; the standard became stricter.
The table below connects each AC star rating to its ISEER range under the 2026 BEE standards (effective from January 2026), along with estimated annual energy consumption and monthly electricity cost for a 1.5-ton split AC running 8 hours per day at ₹7/unit:
| Star Rating (2026 norms) | ISEER Range (split AC) | ~Annual kWh (1.5 ton) | Monthly bill (8 hrs, ₹7/unit) |
| 1 star | Below 3.5 | ~1,600+ | ~₹2,987+ |
| 2 star | 3.5–3.99 | ~1,400 | ~₹2,613 |
| 3 star | 4.0–4.99 | ~1,097 | ~₹2,048 |
| 4 star | 5.0–5.59 | ~900 | ~₹1,680 |
| 5 star | 5.6 and above (from Jan 2026) | ~700–850 | ~₹1,307–1,587 |
One often-overlooked point is that ISEER can differ significantly within the same star band. A CSE analysis found that within the 3-star band for split inverter ACs, the ISEER range goes from 3.7 to 4.38. This difference can lead to annual electricity costs of about ₹800 to 1,200 at current rates.
Yes, a 5-star AC uses less electricity than a 3-star AC of the same capacity. The key question is whether the extra upfront cost is justified by the savings over time. The table below compares the running costs of a 1.5-ton 3-star versus a 5-star inverter AC for different daily usage levels:
| Usage (hours/day) | 3-star inverter annual cost (₹7/unit) | 5-star inverter annual cost (₹7/unit) |
| 4 hrs | ~₹10,230 | ~₹8,050 |
| 6 hrs | ~₹15,344 | ~₹12,075 |
| 8 hrs | ~₹20,459 | ~₹16,100 |
| Annual savings (5-star vs 3-star) | — | ₹2,180–4,359/year |
For daily use of 6 or more hours, typical in Indian homes from March to July, the 5-star model pays for its ₹3,000–5,000 price increase within 2–3 years. For occasional use of 3–4 hours per day, the 3-star inverter is the more cost-effective option. Onida offers both 3-star and 5-star inverter models with ISEER 5.2+ for the 5-star variants, and all come with a 10-year compressor warranty. You can explore the range at Onida’s Inverter AC page.
A 5-star AC costs more upfront because it uses a higher-grade inverter compressor, better motor windings, and more advanced electronics to achieve the higher ISEER value. Since the start of India's BEE program, split AC efficiency at the 5-star level has improved by 61%. (Source: PIB / BEE, 2023.) The 5-star AC you buy today is much more efficient than a 5-star model from even five years ago.
For heavy summer use, Onida recommends its 5-star inverter range of ACs, which achieve ISEER 5.2 and above, operate without a stabiliser from 160V to 290V, and cool even in ambient temperatures up to 55°C. You can recover the additional upfront cost through electricity savings within 2–3 years of regular use. Check current models at onida.com/product-category/air-conditioner/ or use the Onida AC selection guide at How to choose an AC.
More stars indicate that the AC uses less electricity for the same cooling output. The AC star rating ranges from 1 to 5. A 5-star model uses about 35–40% less power than a 1-star unit of the same size. Ratings are based on the ISEER value (Indian Seasonal Energy Efficiency Ratio) and tested across the temperature range of 24°C to 43°C, which is typical in India.
ISEER stands for Indian Seasonal Energy Efficiency Ratio. It measures the cooling output an AC provides per unit of electricity used, tested in Indian temperature conditions from 24°C to 43°C. A higher ISEER rating in AC indicates better efficiency. Introduced by BEE in 2018, ISEER replaces the older EER system, which tested only at 35°C.
The BEE label on an AC shows five details: the star rating (1–5), ISEER value, annual kWh consumption, label validity period, and model details. You should compare ISEER values directly between models and check the label year, as BEE updates thresholds from time to time, which can shift star bands. You can verify models at beeindia.gov.in.
Yes, a 5-star AC uses around 20–35% less electricity than a 3-star AC of the same capacity. For daily use of 6 hours or more in summer, the ₹3,000–5,000 price increase is usually recovered through savings within 2–3 years. For occasional use of under 4 hours a day, a 3-star inverter is a more economical choice.
A 5-star inverter AC saves approximately ₹2,200–4,350 per year compared to a 3-star model when used for 6–8 hours daily at ₹7/unit. Annually, a 5-star 1.5-ton unit consumes roughly 700–850 kWh, while a 3-star non-inverter uses about 1,097 kWh. This results in a saving of 250–400 kWh/year.
A 3-star AC is a good option for moderate use of 4–5 hours per day or for rooms that are used occasionally. Under the 2026 BEE norms, a 3-star split AC now requires an ISEER of 4.0–4.99, which was previously equivalent to 4-star performance under earlier standards. For heavy daily use of 6 hours or more, a 5-star inverter pays for itself more quickly. Onida offers 3-star inverter models in its 1-ton and 1.5-ton range.
To check, look at the BEE label on the indoor unit or packaging. Focus on the ISEER value and the annual kWh usage. The lower the kWh and the higher the ISEER, the more efficient the model is. Also, verify the label year; compare only models with the same label validity period. Use BEE's official comparison tool at beeindia.gov.in/search-compare.
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