What impact will it have on our power bill by switching to energy efficient windows?

Originating in 1992, with help from ENERGY STAR®, American families and businesses saved $297 billion on utility bills and prevented more than 2.1 billion metric tons of greenhouse gas emissions by 2013. All Pella® products meet or exceed ENERGY STAR certification in all 50 states and most of Canada. What impact will this have on you? Not only might your notice a decrease with your heating and cooling charges, you can help protect the environment.