No matter what kind of weather the Concord area is facing, you can be confident that windows and doors from Pella of Concord can withstand it. Our products are designed to be energy efficient. Because of that, 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 made to excel in specific weather areas across North America. Find out more about our energy-saving glass options and technology.