The 350 Series is the company’s new line of energy-efficient vinyl windows. It’s made with up to 18 insulating chambers—three times more than typical vinyl—and features smooth welded corners, beveled-edge frames, and metal-reinforced vinyl members. A variety of glazing options are available, including low-E triple-pane glass with argon. Cost: $279 and up. Pella Corp. 888-847-3552.