With Utility bills on the rise for the past few years and for the FORESEEABLE FUTURE.. Now is the time to make your home as energy efficient as you can. Prices on energy efficient windows and doors are not going down, I think we all know that. So if your window and door openings are leaking or rotting, NOW is the time to replace them. AND, while you are doing it, why not do it right the first time and get a superior product with a lifetime warranty that requires little to no maintainance. Our Elite 4000 is AMONG THE MOST ENERGY EFFICIENT windows available in the market today! Triple glazing with gas fill combinations can give you R factors over 5.