Energy Star is a program run by Natural Resources Canada that was created to monitor and regulate the efficiency of various home construction products such as windows, appliances, furnaces, etc. Manufacturers submit their products to be tested and certified. If compliant, it means that products rank in the top 15 or top 30 percent in the niche in terms of energy performance. Energy Star certified products not only save money on your utility bill but also increase the value of your home.