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

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