Here are a few options to consider when choosing the best window treatments for replacement windows: Roller Shades - Roller shades are some of the most popular window treatments on the market and they are energy efficient, fashionable, and functional. Curtains or Drapes - These fabric window coverings are timeless classics that never go out of style—if you use the right fabric. Cellular Shades - This option can be customized to fit any window, even large ones. Interior Shutters - If you decide to put window shutters onto your home, they are a permanent window treatment that once installed, won’t ever have to be replaced.