No matter what kind of weather the Charlotte area is dealing with, you can be certain that windows and doors from Pella of Charlotte can handle it. Our products are built to be energy efficient. As a result, our ENERGY STAR®-certified windows and doors1 can help lower your energy costs. This ENERGY STAR certification is a result of our energy-efficient products like double- and triple-pane glass, Low-E coating and glass panes built to excel in specific climates across North America. Learn more about our energy-saving glass features and technology.