No matter what type of weather the Washington DC area is facing, you can be confident that windows and doors from Pella of Washington DC can withstand it. Our products are designed to be energy efficient. As a result, our ENERGY STAR®-certified windows and doors1 can help reduce 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 climates across North America. Learn more about our energy-saving glass features and technology.