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Star Rating EER (W/W)

Min. Max.

1. Star 2.50 2.69

2. Star 2.70 2.89

3. Star 2.90 3.09

4. Star 3.10 3.29

5. Star 3.30

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ACs consume 40% of your utility bills choose wisely!

Fig-1: Average distribution of power utility bills

Current estimates indicate that nearly 40% of an average family's power consumption comes from cooling! So how do you go about

selecting an ene rgy efficient AC system to help you keep your cool this s umm er, without burning a hole in your pocket?

While limiting the us age of ACs for relevant occasions is p rudent, on a practical note you need to opt for the AC with the right ratings

in the Power Labels This would help you save significantly on power bills as also taking care oftips to maintain cooling ACs

would help you maintain the balance.

Power Savings Label

On any power savings label you would notice the EER & STAR Rating.

EER is defined as the ratio between the cooling capacity and the power input into an AC. If you have a 1 Ton AC rated at about 3,500

Watts, then for every 1,000 watts cons umed, your AC has an EER of 3.5W/W. Technobabble aside, it tells you how m uch cooling can

your AC give you for the amount of power you give it. Bottom line is: The higher the EER, the more efficient is your AC.

STAR Ratings are closely linked to EERs. In the earlier example, the EER of 3.5 that we calculated earns the AC a 5-STAR rating. On

the other hand, A 3500W AC of 1 Ton which consumes 1400 watts of electricity (a full 400W m ore than the earlier example) in stead

has an EER of 3500/1400 Watts = 2.5 W/W or an Energy rating of 1 STAR.

Once you have made the choice between Split & Windows AC refer to this table for the mapping between EER & the STAR rating

system - updated for 2012:

Star Rating EER (W/W)

Min. Max.

1. Star 2.30 2.49

2. Star 2.50 2.69

3. Star 2.70 2.89

4. Star 2.90 3.09

5. Star 3.10

2012 STAREER mapping for Windows AC

is the same as for 2011 2012 STAREER mapping for Split ACs

Most people won't be going around with ratios and num bers rattling around in their heads; instead, it's easier to remember if an AC is

rated 1, 2, or 3 STARs. Thus, the higher the number of STARs, the mo re energy efficient is the AC. When purchasing an AC, it's w ise

to select one that has the STAR label on it. Why? Because such appliances begin paying for themselves the minute you have them

installed and s witched on. Don't believe us? These num bers s hould convince you:

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STAR Rating Efficiency

Ratio (EER)

Cooling

Capacity

(Watts)

Input

Power

(watts)

Units

Consumption /

Day (kWh)

Per Unit

Charge

(Approx. cost

in Rs.)

Electricity

Cost/Month (in

Rs.)

Cost Saving Per

Year (w.r.t.

number of

STARs)

(Approx.)

2.5-2.69 5200 2261 9.04 2.5 678 308

2.7-2.89 5200 2080 8.32 2.5 624 851

2.9-3.09 5200 1926 7.7 2.5 578 1313

3.10-3.29 5200 1793 7.17 2.5 538 1712

>=3.30 5200 1677 6.71 2.5 503 2059

Note: Assuming 8 hours operation per day for five mon ths in a year Source: Bureau of Energy Efficiency

Table 1: Star Ratings vs. ROI

As you can see from the cos t savings o ffered above, the higher the number of STARs, the greater is the savings in electricity

consum ption. Ass uming you use a 1.5 Ton AC, 8 hours a day, for five months in a year, you save more than two thousand rupees a

year!

Understanding TCO (Total cost of ownership)

Without mincing words , its a fact that the higher the STAR rating of an AC, the higher its cost. Considering other factors, the sharp

AC shopper will real ize how much better a deal a Star-rated AC is than a run -of-the-mil l AC that will, in the long run, cos t more in

terms of energy consumption. With the total operating life of an AC las ting anywhere for 8 to 10 years, isnt it prudent to select an AC

that will provide returns for you in terms o f energy consumption?

Lets do the ma th: a 5 STAR-rated AC costs anywhere from Rs. 25,000 to Rs . 35,000. If it saves you Rs . 2,000 a year in energy

savings, the AC will have repaid m ore than 100% of its cost during its maintenance-free operating life. In addition to this, youre

secure in the knowledge that a 5-STAR rated machine may have an even longer trouble-free operating life; STAR rated m achines are

engineered to be m ore efficient their components are m ade of better quality materials and they are sturdier in comparison to their

ordinary brethren.

Power Savings & the Right Size

With ACs, s ize does m atter, but bigger does nt necessarily mean better. Why use a 1 Ton AC when a 3 Ton AC will cool faster,

right? WRONG! The 3 Ton AC will definitely cool a room faster than a 1 Ton (were ass uming here that the 1 Ton is sufficient to cool

the room in the first place) but when the temperature rises , the compressor of the AC will keep cutting in to reduce the temperature

thereby using more power. The 1 Ton AC will take a bit longer to cool the room, but will us e less energy because it will keep the room

cooler for longer. So where you think youll be us ing less power, your 3 Ton AC will actually drill a s izeable hole in your pocket not

to mention, of course, the initial cost which will be m uch higher than a 1 Ton AC.

Going the other way is just as bad if you select a 0.5 Ton AC to cool an area which actually requires a 1 Ton AC, the compres sor

will run cons tantly. Not only will this res ult in raised eyebrows and widening eyes when you get your electricity bill, it will also result in

considerable wear and tear of the AC compressor; which like all temperam ental mechanical devices, will give up the ghost in the

heat of summ er and leave you in the lurch. Click here for pointers to select the Right sized AC for your room.

So there you have it. The choice is yours: you can choos e to buy an AC that is cheaper but in the long run is bad for your wallet (and

the environment, we might add) or you could step into one of our stores and select the energy STAR rated AC that suits your needs

best! Choose wisely go for the latest STAR rated ACs.

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