The energy label can be used in determining the efficiency of a certain product or to compare its efficiency with similar products. The more stars there is in the label is an indication that the appliance is more efficient as compared with other units, with the same specifications, with lesser stars.  A one-star rating shows that the product is still efficient but not as efficient as those with five-star rating. If you wish to further compare two (2) or more products that have the same number of stars, then you can use the Energy Efficiency Rating (EER) or the numerical representation of the efficiency metric.