All Northeast windows are gold label compliant, meaning we have passed rigorous structural tests given by the AAMA (American Architectural Manufacturers Association) Along with AMAA, Energy Star and the NFRC (National Fenestration Rating Council) randomly tests the U factor of our windows twice a year. Northeast consistently receives some of the lowest U Values in the region. Buying NorthEast is buying the best. We take great pride in every window that bears the NorthEast name. NorthEast was an industry leader when we inaugurated our limited life-time warranty, which is still the finest in the business. Northeast Windows USA is proud to carry more than 60 sizes in stock, ready to pick up at any moment. Check our inventory department for listed sizes. All of our products are built to last, and are backed by an on-going lifetime warranty. Along with our inventory, NorthEast also carries a full product line of Double Hungs, Sliders, Hoppers, Patio Doors, Garden windows, awning windows, and Bays & Bows. Each one of these products can be fully customizable with an array of options from color, glass type, grids, and insulations. We want to thank all of our recent and future customers. We pledge that we will do everything possible to make your window experience with Northeast a positive and enjoyable one. We want our windows to make your house the best on the block. Please feel free to contact us at any time. Thank you for your continued support!