Materials

Wood windows still dominate the housing market, however, vinyl and composite materials are increasingly popular.

Wood is durable, attractive, energy efficient and can be painted or stained to create a personalized look. Wood, however, requires regular maintenance.

"Wood windows are very popular," says Jeffrey Orme of Crestline Windows & Doors. "Manufacturers also provide alternatives that use wood's desirable properties, require less maintenance and are less susceptible to deterioration."

These alternatives include wood windows covered, or clad, in aluminum or vinyl on the exterior. Both vinyl and aluminum clad windows are virtually maintenance free, look great and perform well, according to Orme.

Because they require no maintenance and cost less, all vinyl and vinyl composite windows are gaining on wood. Once considered flimsy, today's vinyl windows are durable. Crestline vinyl window frames are reinforced with steel stiffeners, and are fusion welded to prevent separation. Vinyl windows cannot be painted, inside or out, limiting the ability to change a home's exterior look or match interior millwork.

All aluminum construction, because it readily conducts heat and cold, is being used less in residential windows as energy codes become more demanding. Aluminum windows have a rigid frame, which can support large panes of glass with little sagging or warping but can eventually pit or dent.

Fiberglass windows are relatively new and therefore are more expensive. Fiberglass windows are typically a solid composite, making them a reliable barrier to outside elements. They have good structural integrity and do not need regular maintenance. Like vinyl, they cannot be stained or painted.