EER indicates the energy efficiency quotient of the refrigerator. This is the amount of electricity consumption by the refrigerator in a year (kWh per year). Keep in mind that cost also increases with increasing stars. Stars varying from 1 to 5 tell how much electricity units will the refrigerator consume, with 1 being the most and 5 being the least. In India, the energy rating system is still not completely reliable like developed countries. So, go with a refrigerator which satisfies your needs and then see the star rating. Even 2 and 3 stars are good if the refrigerator has awesome features.