Star rated Air conditioners!!! Is it really worth buying star rated air conditioners (ac s)

Most websites on air conditioning ratings are now recommending you to buy an ENERGY STAR rated AC. Will these energy saving air conditioners will undoubtedly save you money? Yes it will when compared to the cheapest, least efficient on the market (since the ENERGY STAR ones will be at least 10% more efficient). The star rated will definitely be more efficient than anything more than 8 or 10 years old, because as they become less efficient with time and more over they have out dated electro mechanical parts.

I have done a small calculation based on the wattage consumption and found out the following savings could be achieved by using a 5 star rated Ac over a 0 star rated AC.

Let us consider a small house:

No of operating hours for AC per day: 6 hours
No of days in a year : 300 years ( leaving out 65 days for outing and other things)

AC tonne : 1.5 tonne

Electricity charges : Chennai, India rates are applied


The total energy bill for a '5' star rated Air conditioner for the above configuration and operating pattern is : Rs. 6793 per year

The total energy bill for a '0' star rated Air conditioner for the above configuration and operating pattern would be : Rs. 9887 per year


So you save Rs. 3094 directly on energy bills in addition to that you have reduced your CO2 emissions by saving energy.