Help to Buy Windows |Buying Guide: How to Buy Windows Focus your efforts on finding windows that have passed a series of tests by one or more independent certification organizations. The materials used to make the window must be of high quality and the method in which the windows are assembled should also be superior. Also look for windows that carry the trusted ENERGY STAR label. Windows bearing this label are designed for maximum thermal efficiency to help you save on your heating and cooling costs year round and to help protect the environment. A - Airtightness B - Water Resistance C - Wind Resistance Help to Buy Windows - Typically, the higher the rating a window receives in each of these areas, the better it will perform. Choose a rating level that meets the environmental conditions of your home and your budget. When Should I Replace My Windows: Generally speaking it may be time to replace your windows if any of the following occur: * Upper or low