Windows are an investment in your home's real estate value. They add style- both indoors and out. But old, leaky windows can also add to home heating and cooling costs by as much as 30 to 40 percent. And with energy costs inching upward, windows are getting more attention than ever.

Windows come in many shapes, sizes and styles and are made from a variety of materials. Choosing appropriate windows for your home is a significant decision, but don't get overwhelmed. Know your facts and work with a qualified contractor so you can be prepared for your next window replacement project.

One of today's most popular and versatile window materials is vinyl. Compared to wood or aluminum, vinyl windows are virtually maintenance free and long lasting. Pioneered by CertainTeed in the 1970s, millions have been installed and the demand continues to grow.

Advanced manufacturing techniques shape vinyl windows into different styles, including single- and double-hung, horizontal sliding, casement, architectural shapes and more, even custom shapes and those with decorative glass.

For energy conscious consumers, vinyl is hard to beat. As an example, CertainTeed vinyl windows with Thermaflect® low "E" glazing system help keep homes cooler in summer and warmer in winter. In fact, these windows can reduce heating and cooling costs by as much as 15 percent each year and come with the Environmental Protection Agency's Energy Star rating.