Replacement windows can be a considerable investment; but today’s windows and frames offer more energy efficiency and durability than ever before, so any initial investment soon pays for itself in energy savings. Since your new windows will last for decades, pick out a style and a material that really suit your home. As illustrated in this video clip, you can install fixed pane, sliding, casement, or bay windows. Each style has its advantages and can come in vinyl, aluminum, fiberglass, or wood. Although wood is more expensive, it creates a beautiful finished product.