Replacement windows are windows that are put into an existing window opening to replace the current windows. This is done to replace broken windows and to upgrade to new, energy-efficient windows.
Over time, windows can deteriorate and become weather-beaten and loose. When loose, old windows let in outside air, which can significantly raise energy costs. By replacing old windows, the homeowner not only improves the appearance of the house, but also cuts energy costs. Even if the appearance of the old windows is fine, replacing them with newer, more energy-efficient windows is a good way to save money on heating and cooling.