Quick answer: For most Indian homes, a 1.5 ton split AC covers a 120 to 150 sq ft bedroom. Choose a 5-star inverter model if you run it more than 6 hours a day, because the electricity saving pays back the extra ₹6,000 to ₹10,000 within two to three summers. Check the ISEER rating rather than just the star count, since star thresholds are revised periodically and an older 5-star can rate lower than a newer 4-star. Compare corrosion protection, warranty and local repair support; coil material alone does not determine service life.
What size do you need
| Room size | Recommended capacity | Notes |
|---|---|---|
| Up to 100 sq ft | 0.8–1 ton | Small bedroom, single occupant |
| 100–150 sq ft | 1.5 ton | The most common Indian bedroom size |
| 150–250 sq ft | 1.5–2 ton | Master bedroom or small living room |
| 250–400 sq ft | 2 ton | Living room or hall |
| Above 400 sq ft | 2 ton+ or two units | One large unit struggles to distribute air evenly |
Add capacity if the room faces west, is on the top floor, has large windows, or regularly holds four or more people. In Hyderabad, Delhi and other hot-summer cities, sizing up one step is usually the right call; an undersized AC runs continuously and costs more than a correctly sized one.
Inverter vs non-inverter
| Inverter AC | Non-inverter AC | |
|---|---|---|
| How it works | Compressor speed varies to hold temperature | Compressor switches fully on and off |
| Power use | Model- and usage-dependent | Higher |
| Price (1.5 ton) | ₹35,000–₹55,000 | ₹28,000–₹38,000 |
| Noise | Quieter | Audible on/off cycling |
| Temperature stability | Steady | Fluctuates by 1–2°C |
| Best for | 6+ hours daily use | Occasional use, guest rooms |
| Repair cost | Higher; electronics involved | Lower, any technician |
| Works on low voltage | Better | Struggles |
Savings depend on the actual models, operating conditions, hours and tariff. Estimate cost from their energy labels and your usage; a fixed annual rupee saving or two-year payback is not guaranteed.
Read the ISEER, not just the stars
BEE star ratings are relative to a threshold that gets revised every few years, so a 5-star model from an older rating period can have a lower actual efficiency than a current 4-star. The number that matters is the ISEER (Indian Seasonal Energy Efficiency Ratio), printed on the yellow BEE label. Higher is better. Compare ISEER figures between models rather than trusting star counts alone, and check the year printed on the label.
The specifications that actually matter
- Copper condenser coil. Non-negotiable. Copper cools better, is repairable, and lasts longer. Aluminium or “alloy” coils are cheaper to make and expensive to own.
- Stabiliser-free operation range. Check the actual voltage range quoted, typically 145V to 290V. If your area has frequent fluctuation, a separate stabiliser is still worth having despite the marketing claim.
- Anti-corrosion coating on the outdoor unit if you live near the coast.
- Dust filter quality, which matters a lot in Indian cities; a washable filter you can clean yourself saves service calls.
- Warranty split: typically 1 year comprehensive, 5 years on the condenser, 10 years on the inverter compressor. The compressor warranty is the valuable one.
- Noise level in dB for the indoor unit if it is a bedroom AC; under 40 dB at low fan is comfortable.
Costs beyond the sticker price
| Item | Typical cost |
|---|---|
| Standard installation | Often free, but copper piping beyond 3 metres is charged |
| Extra copper piping | ₹500–₹900 per metre |
| Stabiliser | ₹2,000–₹4,000 if needed |
| Core drilling through wall | ₹300–₹800 |
| Annual servicing | ₹500–₹800 per service, twice a year recommended |
| Gas refill (after some years) | ₹2,000–₹3,500 |
The piping charge catches people out. Measure the distance from your indoor unit position to where the outdoor unit will sit before the installer arrives, so you know what to expect.
Running cost, roughly
A 1.5 ton 5-star inverter AC consumes about 0.8 to 1.1 units per hour in real Indian conditions. At ₹7 per unit and 8 hours a night, that is roughly ₹50 to ₹60 a night, or ₹1,500 to ₹1,800 a month. A 3-star non-inverter in the same room typically runs 40% to 60% higher. Setting the thermostat to 24°C to 26°C rather than 18°C makes a bigger difference to the bill than most people expect.
Frequently asked questions
Is a 5-star always worth the extra cost?
Only if you use it heavily. For a guest room used a few weeks a year, a 3-star non-inverter is the rational choice; the efficiency premium never pays back on low usage.
Window or split AC?
Window units are cheaper to buy and service and suit rentals and small rooms, but are noisier and need a suitable window. Split units are quieter, cool larger rooms better, and are the default choice for bedrooms.
When is the best time to buy?
Late monsoon and winter, roughly September to January, when demand drops and dealers discount. Buying in April or May means peak prices and long installation queues.
Does a higher ton AC cool faster?
It cools faster but cycles more, which can leave the room clammy and waste power. Correct sizing beats oversizing.
Last updated September 2026. Prices, running costs and specifications vary by brand, city and electricity tariff; verify on the product listing and your own tariff before buying. Some links on this site may be affiliate links, which do not affect what you pay.
About the prices in this guide. Indian retail prices move week to week and vary by seller, variant, city and festive offer, and no authority publishes them. Treat every figure here as indicative — useful for judging which tier a product sits in, not as a current quote. Check the live listing price, the exact variant and the final payable amount, including delivery and any exchange or bank offer conditions, before you buy.
Sources
For the current official position, check Bureau of Energy Efficiency — star labelling for appliances. Fees, rates and rules change without notice, and figures in this article are illustrative unless a source is cited beside them.
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