Wood windows can be 100% wood, wood inside and vinyl-clad wood outside. Depending on what is inside your home you may: If the interior design in your home is stained, not painted, you may want to consider wood inside / vinyl outside to maintain the appearance of your woodwork. Wood window installation offers exceptional energy savings, and comes in an almost endless variety of standard sizes and shapes. Wood windows are the good choice when you need to match existing windows, and will add more appeal to your home than vinyl windows.