No matter what type of weather the Gaithersburg area is dealing with, you can be certain that windows and doors from Pella of Gaithersburg can deal with it. Our products are crafted to be energy efficient. As a result, our ENERGY STAR®-certified windows and doors1 can help decrease your energy costs. This ENERGY STAR certification is due to our energy-efficient features like double- and triple-pane glass, Low-E coating and glass panes built to stand strong in specific weather areas across North America. Discover more about our energy-saving glass features and technology.