Wouldn’t it be nice to reduce energy bills as well as maintenance chores? Affordable Exteriors offers Charter Oak® Energy Elite is an insulated siding system that combines select materials and refined designs with exceptional energy efficiency. The inside of your home will be cooler in summer, warmer in winter and quieter year-round because Charter Oak Energy Elite is manufactured with Fullback®, a precisely contoured insulating foam underlayment that provides all the benefits of our flagship Charter Oak® premium vinyl siding.