Head-to-Head · Cooling Appliances
3 Star vs 5 Star 1.5 Ton AC: Which Should You Buy in India?
By Bikram Nath · Updated 2026-08-01 · How we pick · Affiliate disclosure: links earn a small commission
The short answer
This is one model in two energy grades, so the decision is pure economics.
Best on features
LG 1.5 Ton 5 Star Smart Inverter Split AC (AS-Q19YNZE1)
Best on value
LG 1.5 Ton 3 Star Smart Inverter Split AC (AS-Q18JNXE)
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When you shortlist a 1.5 Ton split AC in India, the choice often comes down to a 3-star and a 5-star version of the same model — and that is exactly the case here. Both units below are LG 1.5 Ton Smart Inverter splits with a 100% copper condenser, AI Convertible 6-in-1 cooling and an identical 10-year compressor warranty, so the real variable between them is the energy label. The 3-star (AS-Q18JNXE) carries a 4.43 ISEER and an annual energy consumption of 769.55 units; the 5-star (AS-Q19YNZE1) lifts that to a 5.77 ISEER and 671.15 units a year — about 98 units less. That efficiency gap is the whole decision: the 5-star costs more at checkout but draws less power every hour it runs, while the 3-star saves you money upfront. This comparison works out when that trade actually pays off, using the real energy numbers rather than the marketing on the box.
Specs compared
| Spec | LG 1.5 Ton 3 Star Smart Inverter Split AC (AS-Q18JNXE) | LG 1.5 Ton 5 Star Smart Inverter Split AC (AS-Q19YNZE1) |
|---|---|---|
| Capacity & rating | 1.5 Ton · 3 Star | 1.5 Ton · 5 Star✓ |
| Energy efficiency (ISEER) | 4.43 | 5.77✓ |
| Annual energy use | 769.55 units/year | 671.15 units/year✓ |
| Cooling capacity | 4400 W | 5000 W✓ |
| Compressor | Smart Inverter (variable speed) | Smart Inverter (variable speed) |
| Indoor airflow | 441 CFM indoor · 2-way swing | 653 CFM indoor · 4-way swing✓ |
| Air filter | HD Filter with anti-virus protection | HD Filter |
| Convertible cooling | AI Convertible 6-in-1 (Diet Mode+) | AI Convertible 6-in-1 (VIRAAT mode) |
| Warranty | 1 yr product · 5 yr PCB & motor · 10 yr compressor | 1 yr product · 5 yr PCB & motor · 10 yr compressor |
Pros & cons
LG 1.5 Ton 3 Star Smart Inverter Split AC (AS-Q18JNXE)
Pros
- +Lower upfront price — the cheaper way into LG's Smart Inverter cooling
- +Same 100% copper condenser and 10-year compressor warranty as the 5-star
- +AI Convertible 6-in-1 modes plus Diet Mode+ for flexible, lighter-load cooling
- +4400 W cooling is ample for a small 111–150 sq ft room used a few hours a day
Cons
- −Higher 769.55 units/year draw means a bigger electricity bill under heavy, all-day use
- −Lower 4.43 ISEER, 441 CFM indoor airflow and 2-way swing trail the 5-star
LG 1.5 Ton 5 Star Smart Inverter Split AC (AS-Q19YNZE1)
Pros
- +Class-leading 5.77 ISEER — the lowest running cost of the two over a hot summer
- +Uses about 98 units a year less electricity than the 3-star (671.15 vs 769.55)
- +Stronger 5000 W cooling, 653 CFM indoor airflow and 4-way swing for even, faster cooling
- +VIRAAT mode plus AI Convertible 6-in-1 for high-ambient Indian summers
Cons
- −Higher price premium at checkout that takes years of savings to pay back
- −Overkill for a lightly used room where the efficiency gap barely shows on the bill
Our verdict
This is one model in two energy grades, so the decision is pure economics. The 5-star LG 1.5 Ton (5.77 ISEER, 671.15 units a year) is the better buy for heavy, all-day cooling in hot, high-tariff conditions — it uses about 98 units a year less than the 3-star and cools slightly stronger, so its checkout premium pays back over a few years of steady use. The 3-star LG 1.5 Ton (4.43 ISEER, 769.55 units a year) is the better buy for moderate use or a tighter upfront budget, where the roughly ₹785-a-year efficiency gap at ₹8 a unit barely justifies paying more today. Same compressor, same copper condenser, same 10-year warranty — choose the 5-star for long-run savings and the 3-star for a lower price now, based on how many hours you will actually run it.
Best for value
LG 1.5 Ton 3 Star Smart Inverter Split AC (AS-Q18JNXE)
Best for features
LG 1.5 Ton 5 Star Smart Inverter Split AC (AS-Q19YNZE1)
Prices and availability on Amazon.in change frequently — the price on the Amazon product page at the time of purchase is the one that applies. As an Amazon Associate, PakkaPick earns from qualifying purchases; your price is unaffected.
Editor's take
Buy the 5-star LG 1.5 Ton if the AC will run long and hard — all-day cooling through a hot Indian summer, an expensive-electricity state, or a warmer 150 sq ft room. Its 5.77 ISEER and roughly 98-units-a-year lower consumption steadily claw back the checkout premium, and it cools a touch faster with stronger airflow and 4-way swing. Buy the 3-star LG 1.5 Ton if the room is used only a few hours a day, your budget is tighter upfront, or your tariff is low — the efficiency gap costs you around ₹785 a year at ₹8 a unit, and the lower price is the better use of your money. Both share the same compressor, copper condenser and 10-year warranty, so this is not efficiency versus quality — it is an upfront saving versus a long-run running-cost saving, decided entirely by how many hours the AC actually runs.
Editor's read
The honest read on 3-star versus 5-star is that it is a maths problem, not a quality problem. Both LG units use the same Smart Inverter compressor, the same 100% copper condenser and the same 10-year compressor warranty, so neither is the 'cheap' unit — the only meaningful difference is efficiency. The 5-star's 5.77 ISEER and 671.15 units a year beat the 3-star's 4.43 ISEER and 769.55 units by about 98 units annually, worth roughly ₹785 a year at an illustrative ₹8 per unit and more where tariffs or usage run higher. Against that sits the price premium you see at checkout. The 5-star is genuinely the better long-term buy for heavy, all-day cooling in a hot state, where the saving compounds and can cover the premium within a few years. But it is not automatically worth it: for a room used a few hours a day, or on a tight upfront budget, the 3-star's lower price wins and the efficiency gap barely shows on the bill. Decide by your hours of use, not by the higher number on the label.
— Bikram, editor
How we compared these
This head-to-head is researched from each product's published specifications, manufacturer documentation, expert reviews and the aggregate of genuine Indian buyer feedback — not hands-on lab testing. We weigh the specs that actually matter for Indian conditions (voltage variability, hard water, monsoon humidity, service-network reach) and tell you which contender suits which buyer, rather than claiming to have bench-tested either unit. We do not accept paid placements — our only commercial relationship is the Amazon affiliate link. See our full methodology.
What to look for
- 1Start with how many hours a day the AC will run: The star rating only matters in proportion to running hours. The 5-star's higher 5.77 ISEER saves the most when the compressor runs long and often — think all-day use in a hot state through the peak summer months. If the AC comes on for only a few hours on the hottest nights, the 3-star's 4.43 ISEER costs you very little extra and the lower upfront price wins.
- 2Do the running-cost maths for your own tariff: The 5-star here uses about 98 units a year less than the 3-star (671.15 vs 769.55 units). At an illustrative ₹8 per unit that is roughly ₹785 a year saved — but electricity tariffs vary widely by state and slab, and the saving grows if you run the AC harder or longer than the rating-lab assumptions. Plug in your own per-unit rate and honest usage before deciding the premium is worth it.
- 3Weigh the checkout premium against the payback years: The 5-star commands a higher price than the 3-star at checkout. Divide the premium you actually pay by your yearly running-cost saving to see the payback period. For heavy users in expensive-electricity states it can pay back in a few years; for light users it may take most of the AC's life — at which point the 5-star is not automatically the smart buy.
- 4Remember the star label is not the only difference here: This particular 5-star also has slightly stronger cooling (5000 W vs 4400 W), higher indoor airflow (653 vs 441 CFM) and 4-way swing versus 2-way. For a warmer 150 sq ft room that helps it cool faster and more evenly; for a small, well-shaded room the 3-star's 4400 W is already enough.
- 5Match tonnage and rating to the room, not to the badge: Both are correctly sized 1.5 Ton units for a 111–150 sq ft room. A bigger star rating on an oversized or barely used AC saves nothing; the right tonnage for the room does more for your bill than jumping from 3-star to 5-star. Size first, then choose the rating that fits your hours of use and budget.
Also worth a look
A 4 Star 1.5 Ton inverter AC
The middle path if you cannot decide between these two — a 4-star sits between them on both price and running cost, a sensible compromise for medium daily use where a 5-star premium feels steep but a 3-star's efficiency feels short.
A value-brand 5 Star 1.5 Ton (e.g. Cruise or Lloyd)
If you want 5-star efficiency at a lower price than a premium badge, value brands offer competitive ISEER numbers, usually with a smaller service network and shorter track record — check local after-sales support before committing.
Frequently asked questions
Is a 5 star AC worth it over a 3 star in India?
It depends on how much you run it. A 5-star 1.5 Ton like the LG here uses about 98 units a year less than the equivalent 3-star (671.15 vs 769.55 units), worth roughly ₹785 a year at an illustrative ₹8 per unit — more if your tariff is higher or you run the AC all day. For heavy, all-summer use in a hot state that saving covers the higher checkout price within a few years, so the 5-star is worth it. For a room used only a few hours a day, the 3-star's lower upfront price usually wins.
How much electricity does a 5 star AC save compared to a 3 star?
On these two LG 1.5 Ton units, the 5-star is rated at 671.15 units a year and the 3-star at 769.55 units — a difference of about 98 units annually under the standard BEE test assumptions. At an illustrative ₹8 per unit that is roughly ₹785 a year. Your real saving depends on your state's tariff and how many hours a day you actually run the AC; heavier use widens the gap, light use narrows it.
Is 3 star or 5 star AC better for a bedroom?
For a bedroom used mainly at night for a few hours, a 3-star 1.5 Ton is often the sensible choice — the running-cost gap over a 5-star is small at low usage, and the upfront saving is real. If the bedroom is in a hot city, used through the day, or you keep the AC on all night through summer, the 5-star's higher 5.77 ISEER earns its premium. Match the rating to your hours of use rather than assuming 5-star is always better.
Do 3 star and 5 star ACs cool the same?
Cooling capacity is set by tonnage, not the star rating, so both 1.5 Ton units are sized for the same 111–150 sq ft room. In practice this particular 5-star also has a slightly higher 5000 W cooling capacity, 653 CFM indoor airflow and 4-way swing versus the 3-star's 4400 W, 441 CFM and 2-way swing, so it cools a touch faster and more evenly. The star rating itself, though, is about efficiency — how much power is used to deliver that cooling — not how cold the room finally gets.