🏆 Best 1.5 Ton AC
Blue Star 1.5 Ton 5 Star Inverter Split AC IC718QCUS
Blue Star
8.4/10
₹54,99025% off
- 1.5 ton
- 5 star
- Split
A main bedroom or living room run for long nights through summer
View details
🧊 Air conditioner
Brand: Panasonic
Panasonic 2 Ton 5 Star Wi-Fi Inverter Split AC CS/CU-NU24BKY5W
The most efficient 2 ton-class AC we compare
8.4/10
Our editorial score
Very good — recommended
Large rooms cooled for many hours a day
- Capacity
- 2 ton
- Energy rating
- 5 star · ISEER 5.8
- Type
- Split, inverter
- Compressor warranty
- 10 years
About this air conditioner
- ISEER 5.8 — among the most efficient 2 ton units we compare, which is what keeps the summer bill down
- 815 declared units a year — about ₹6,520 over a BEE season at ₹8 a unit
- Rated to keep cooling at 55°C outdoors — real headroom for a top floor in a 45°C city
- 10-year compressor warranty and 5-year PCB warranty
- 8-in-1 convertible — runs as a smaller AC on mild nights and draws less power
How it scores
Cooling performance8.0
Build & coil quality8.8
Value for money7.6
Electricity cost9.3
Installation & service8.0
Our verdict
An ISEER of 5.8 and 815 declared units a year make this the most efficient 2 ton-class AC on our list — 121 units a year fewer than Blue Star's 5-star 2 ton and 423 fewer than Daikin's 3-star one. It adds Wi-Fi, eight convertible steps, 4-way swing, an Eco-Tough outdoor casing and a 55°C rating.
Rated cooling is 6,100 W, the same as Blue Star's IC524DNUR, which costs ₹11,000 less. Over a BEE season the Panasonic saves about ₹970 a year at ₹8 a unit, so the extra cost pays back only with heavy daily use.
What we like
- ISEER 5.8 — among the most efficient 2 ton units we compare, which is what keeps the summer bill down
- 815 declared units a year — about ₹6,520 over a BEE season at ₹8 a unit
- Rated to keep cooling at 55°C outdoors — real headroom for a top floor in a 45°C city
- 10-year compressor warranty and 5-year PCB warranty
- 8-in-1 convertible — runs as a smaller AC on mild nights and draws less power
What we don't
- 6,100 W rated cooling is 13% below a true 2 ton (7,034 W), so size it for a smaller room
- Indoor noise is published only at high fan speed, so night-time noise cannot be compared with brands that publish the lowest setting
When this is not a good choice
Every condition below is derived from this product's published specifications and from how it compares with the air conditioners we track — so you can check each one against your own room, supply or budget rather than take our word for it.
You live outside a metro or a major service town
Panasonic's service network is rated limited rather than excellent. Filter availability and callout times are what decide whether a purifier is still running in five years, and they are worth checking for your pin code before you buy.
How we score service reach →Length of cover matters to you
Total cover is 12 months, against a median of 60 months across the ac purifiers we track.
Full specifications
| Type | Split AC, inverter compressor |
|---|---|
| Model code | CS/CU-NU24BKY5W |
| Capacity | 2 ton — 6,100 W rated cooling |
| Energy rating | 5 star |
| ISEER | 5.8 |
| Annual energy use | 815 units/year declared (BEE 1,600-hour season) ≈ ₹6,520 at ₹8/unit |
| Refrigerant | R32 |
| Condenser | Copper |
| Coil protection | Shield Blu+ |
| Rated ambient | Cools up to 55°C outdoors |
| Convertible modes | 8-in-1 |
| Wi-Fi | Built in — Amazon Alexa and Hey Google |
| Stabiliser-free range | 100-290 V |
| Indoor noise | 49 dB(A) at high fan speed, as published |
| Indoor unit (H×W×D) | 296 × 1040 × 249 mm |
| Warranty | 1 year comprehensive, with compressor cover to 10 years and PCB cover to 5 years, as listed by Panasonic |
| Price source | Panasonic official store, checked 2026-09-14 |
Specifications are from manufacturer literature and were checked at the last price-verification date. Brands occasionally revise stage counts, tank sizes and warranty terms without changing the model name — confirm against the current listing before purchasing.
About Panasonic
The engineer's choice, and the most under-bought premium shaver brand in India. Panasonic's Arc series is built around two specifications nobody else matches: blades ground to a 30-degree nanopolished edge, and a linear motor spinning at 14,000 cycles per minute against Braun's roughly 10,000. The practical effect is that an Arc5 or Arc6 cuts thick, coarse, fast-growing beard hair — the common Indian beard type — in fewer passes and with less irritation than anything else sold here. Poor retail presence, not product, is why so few Indian buyers own one.
Service: limitedPrice band: premiumHQ: Osaka, Japan
Panasonic 2 Ton 5 Star Wi-Fi Inverter Split AC CS/CU-NU24BKY5W — frequently asked questions
What room size is the Panasonic CS/CU-NU24BKY5W suitable for?
Rated at 6,100 W, it suits a middle-floor room of up to about 230 sq ft with a 10 ft ceiling, or about 170 sq ft on a top floor with strong afternoon sun. Each person beyond two adds load, and a room open to a kitchen needs more. Our AC tonnage calculator works this out for your exact room.
How much electricity does the Panasonic CS/CU-NU24BKY5W use?
Its BEE label declares 815 units a year, measured over a 1,600-hour cooling season — about 5 hours a day for 11 months, or 8 hours a night for 6-7 months. At ₹8 a unit that is roughly ₹6,520 a year, at an ISEER of 5.8. Real use varies with room size, set temperature and how hot your summer is; setting 24-26°C rather than 18°C cuts it substantially.
What warranty does the Panasonic CS/CU-NU24BKY5W come with?
1 year comprehensive, with compressor cover to 10 years and PCB cover to 5 years, as listed by Panasonic. Warranty on an inverter AC matters most for the compressor and the PCB, the two most expensive parts to replace, so check both are listed on your invoice and register the product with Panasonic after installation.
Does the Panasonic CS/CU-NU24BKY5W have Wi-Fi?
Yes, Wi-Fi is built in, with Amazon Alexa and Hey Google. You can switch it on before reaching home, schedule it and, on most brands' apps, see energy use — which is the feature that actually changes behaviour.
Where can I buy the Panasonic CS/CU-NU24BKY5W at the best price?
We list ₹65,990 from Panasonic official store on 2026-09-14. AC prices move weekly and are often lower on Amazon and Flipkart, especially in bank-offer weeks, so compare all three before buying — and check what installation is included, because extra copper pipe and an outdoor stand are usually charged separately.
Alternatives at a similar price
Blue Star 1.5 Ton 5 Star Inverter Split AC IA518GXUS
Blue Star
8.4/10
₹49,99034% off
- 1.5 ton
- 5 star
- Split
Families who want to cap how much electricity the AC can use in a month
View details
🏆 Best 2 Ton AC
Blue Star 2 Ton 5 Star Inverter Split AC IC524DNUR
Blue Star
8.4/10
₹54,99030% off
- 2 ton
- 5 star
- Split
Halls and living rooms of 200-230 sq ft run for long hours
View details
🏆 Best Smart AC
Panasonic 1.5 Ton 5 Star Wi-Fi Inverter Split AC CS/CU-HU18CKY5XFMH-P
Panasonic
8.4/10
₹53,48026% off
- 1.5 ton
- 5 star
- Split
Smart-home households in polluted cities
View details