clock menu more-arrow no yes mobile

New windows can make a dramatic difference in any home, whether you want to improve its appearance, open up a spectacular view or simply replace worn units that seem to let in more wind and rain than they keep out.

Modern window frames cut air infiltration down to almost zero and, when used with advanced glazings, can slash up to 40 percent off your heating and cooling bills. Some windows also free you from periodic painting. Still others rival fine cabinetry in eye appeal.

Manufacturers have expanded those choices with new frame materials, glazing and installation options. Indeed, "replacement windows" are no longer limited to the kind that involve ripping out the old window and installing a new prime window.

They now include money-saving versions that allow you to replace the glass and sash without replacing the frame. While the added options also expand your decisions list, new labeling programs make choosing well-built, energy-efficient windows easier than ever.

Material Choices

Windows frames come in a number of different materials, including wood, vinyl aluminum, fiberglass and composite plastic.

Vinyl-frame windows are the most affordable — as little as half the price of comparable wood-frame versions. They're also especially energy efficient, thanks to a honeycomb of chambers that boost insulating ability by trapping air, and can be built to fit any size opening. And unlike wood, they never need repainting, though colors are limited.

Vinyl-frame windows first appeared in the 1970s when small fabricators produced custom replacement options in sizes not offered by manufacturers of stock wood windows. Today, nationwide companies such as Owens Corning and CertainTeed offer a variety of units in stock and custom sizes. Even traditional wood-window companies now offer vinyl-frame replacement lines; Retrovision from Weather Shield and Monument from Hurd are two prominent examples.

When shopping, look for a uniform color throughout the frame. Also look for joints that are heat-welded rather than joined with screws or other fasteners. You can expect a two- to six-week wait if you order custom units.

Photo by Trevor Johnston

Wood-frame windows are slowly losing their market dominance to vinyl, though they're still considered the gold standard by many professional installers and homeowners. They're strong, beautiful and relatively energy efficient. As might be expected, good ones also cost the most. The knock against them is maintenance: They must be painted or stained periodically to look good and remain protected from the elements.

Some manufacturers address that required upkeep by cladding the wood with vinyl — as is the case with Andersen Windows — or aluminum. The result is a tough, maintenance-free exterior and a natural-wood interior that you can paint or stain. These advantages mean clad-wood windows usually cost more than ordinary wood.

When shopping for wood windows, look for easy operation and tight-fitting corners. Be sure any exposed wood is free of blemishes and that finger joints aren't visible.

Aluminum-frame windows offer the low cost and low maintenance of vinyl versions; they're also durable. The major drawback to aluminum-frame windows is their metal frame-they conduct heat easily, earning them a high U-value. (Higher is not better here — the higher the U-value, the more heat a frame loses.) Compared with vinyl or wood frames, which fall within the 0.3 to 0.5 range, aluminum frames can have a U-value as high as 2. They also tend to feel cold to the touch and are prone to condensation.

Those drawbacks make aluminum-frame windows suitable only for warm climates where cooling bills are greater than heating bills. If you decide to install aluminum windows, be sure the ones you order are equipped with a thermal break in the frame — usually a strip of plastic or rubber that keeps the inside and outside of the frame separate in order to help limit heat conductivity.

Fiberglass and composite-frame windows are the newest options. Made from materials similar to those on car bumpers, both are strong, maintenance-free and more energy efficient than vinyl. And at a price roughly between vinyl and wood, they're also affordable.

Owens Corning offers a composite unit called Generations for the replacement market. Marvin produces a line of composite windows called Integrity. Made of Ultrex, a combination of fiberglass and polyester resin, the Marvin units can be painted to suit your taste, something you can't do with vinyl windows.

As with vinyl windows, look for a uniform color throughout the frame and joints that are heat-welded rather than joined with fasteners. And whichever window you're considering, don't go by material alone. "Check out the locks, cranks and lifts," says Carl Germer, of Germer Construction in Rutherford, New Jersey. "They should be easy to use and feel comfortable in your hand. A quality window has quality hardware."

<p>Vinyl Windows can be built to fit any size opening. The Bryn Mawr II series from CertainTeed is available with a variety of glazing systems to help reduce heating and cooling bills. These windows cost $250 to $350 each installed.</p>

Vinyl Windows can be built to fit any size opening. The Bryn Mawr II series from CertainTeed is available with a variety of glazing systems to help reduce heating and cooling bills. These windows cost $250 to $350 each installed.

Photo by Trevor Johnston

Savings and Strength

As recently as 20 years ago, the windows in most homes held a single pane of glass. But for an average-size house, those same windows today can result in significant losses: Single-glazed windows in a cold-climate house would result in a yearly energy bill of about $800, and in a warm-climate house, the energy bill would be about $850, according to Residential Windows: A Guide to New Technologies and Energy Performance , by John Carmody, Stephen Selkowitz and Lisa Heschong. The book, published in 1996, reveals that today's high-tech double glazing would reduce annual energy costs in these same houses to about $450 and $500, respectively.

Most of those savings come from two techniques manufacturers use to make double glazings more efficient: low-e coatings and inert gases that fill the spaces between the panes. Low-e coatings were first developed to stop heat loss; newer coatings also stop heat gain where cooling is the key consideration. These coatings usually add 10 to 15 percent to the cost of a window.

A rating system developed by the National Fenestration Rating Council (NFRC) makes gauging the efficiency of a window quick and easy. A label on each window includes its U-value; its solar heat gain coefficient (SHGC), which tells how much heat it lets in; and its visible light transmittance. If you want to cut energy loss during the heating season, look for windows with low U-values. For optimal cooling, go with units that have a low SHGC but let in plenty of visible light.

You can avoid these ratings comparisons altogether by shopping for windows that carry the Energy Star label. Developed by the U.S. Department of Energy and the Environmental Protection Agency, the program tags the most energy-efficient windows. It also targets requirements to specific climates. Windows that meet these energy requirements are 15 to 40 percent more efficient than those that meet typical building codes.

In cooling-dominated areas, U-values of 0.75 and an SHGC of 0.40 or below are required. In heating-dominated areas, U-values of 0.35 or below are required while there is no SHGC requirement. And in areas with mixed heating and cooling needs, U-values of 0.40 or below and SHGCs of 0.55 or below are required. (The determination for a heating-dominated climate means at least 70 percent of heating and cooling costs go to heating. In a cooling-dominated climate, at least 70 percent of heating and cooling costs go to cooling. In a mixed climate, at least 30 percent of heating and cooling costs go to each.)

Another new program helps ensure that wood, vinyl and aluminum windows meet minimum structural standards. Developed by the American Architectural Manufacturers Association in conjunction with the National Wood Window and Door Association, this nonmandatory program puts windows through their paces with a series of performance tests. Windows that pass the tests are granted a certification sticker.

Photo by Trevor Johnston

Choose the right style

Choosing a window style that goes with the rest of your house is another crucial concern. The wrong choice can ruin the look of your house and lower resale value. Michael J. Crosbie, a writer and architect with Steven Winter Associates, an architectural consulting firm in Norwalk, Connecticut, provides these rules of thumb:

— Traditional or colonial-style homes look best with small double-hung windows with divided lights-referred to as "six-over-six" or "eight-over-eight" to describe the number of panes in each sash.

— For modern or contemporary homes, large, metal-frame units are a safe bet.

— Ranch-style houses often look best with out-swing casement windows that don't have divided lights.

— If you don't like the window style you're replacing, look at designs in similar homes. And ask your dealer or contractor to show you how different styles look in their past jobs.

Window style is critical when adding window area to a wall. "Install units similar or identical to existing windows in shape and size and gang them together — a better arrangement than installing one large unit that looks out of place," Crosbie explains.

Yet another concern is where to locate new windows on a wall — something that depends partly on ceiling and floor locations. An easy way to determine placement, according to Crosbie, is to stand outside and line up the top of the new windows with the top of an existing window. "Even if the new windows aren't the same length, a consistent head height will give them a sense of order on the wall," Crosbie notes.

When shopping, also look at a manufacturer's entire line of windows. Most companies offer their product lines in different materials, grille designs and sizes. Some also offer windows designed specifically to complement older homes. Marvin's line of double-hung windows with curved glazing is an example. "They look great on old Victorians with turrets," Crosbie says.

Walking unprepared into a window showroom or home center can leave you reeling. Some advance planning will help you choose windows that transform your home, save energy and provide years of service.

<p>At home on this traditional house, these divided-light, double-hung windows from Marvin's Integrity line are made of Ultrex, a composite-plastic material that won't warp or rot and can be painted. Price for an average-size window is $375.</p>

At home on this traditional house, these divided-light, double-hung windows from Marvin's Integrity line are made of Ultrex, a composite-plastic material that won't warp or rot and can be painted. Price for an average-size window is $375.

Photo by Trevor Johnston

Where to Find It

Andersen Windows

100 4th Ave. N., Dept. TH598

Bayport, MN 55003



Box 920; Dept. TH598

Rantoul, IL 61866


CertainTeed Corp.

Box 860, Dept. TH598

Valley Forge, PA 19482


Hurd Millwork Co.

575 S. Whelen Ave., Dept. TH598

Medford, WI 54451


Kolbe & Kolbe Millwork Co.

1323 S. 11th Ave., Dept. TH598

Wausau, WI 54401


Marvin Windows and Doors

Box 100, Dept. TH598

Warrod, MN 56763


Owens Corning

1 Owens Corning Pkwy.,Dept. TH598

Toledo, OH 43659


Peachtree Doors and Windows

4350 Peachtree Blvd., Dept. TH598

Norcross, GA 30071


Pella Corp.

102 Main St., Dept. TH598

Pella, IA 50219


Weather Shield Windows and Doors

Box 309, Dept. TH598

Medford, WI 54451