 Answers to Frequently Asked Questions about Energy Efficiency, Frames, Costs, Sizes and Options when Choosing Windows to Install or Replace
NRFC labels help you evaluate the energy performance of new windows and allow
you to comparison shop for the most efficient options. Use them when you make
your choice of windows.
But whether you are replacing windows
or installing them in a newly
constructed building, there are
considerations other than just efficiency
to keep in mind.
Different combinations of frame style,
frame material, and glazing will yield
very different results when comparing
energy efficiency and cost. A fixed-pane
window is the most airtight and the
least expensive, for example -- it would
be the best choice if you wanted to add
sunlight to a room without increasing
ventilation. A window with a wood
frame will usually conduct less heat
than one with an aluminum frame. If
you're seeking efficiency, a double-
pane, low-e window would be just as
efficient as a triple-pane untreated
window, but it would cost and weigh
less. Consider the benefits carefully.
No one window is suitable for every application. Many windows are available that
serve different purposes, and you may discover that you need different types,
depending on the directions that your windows face and your local climate. To make
wise purchases, first examine your heating and cooling needs and weigh the
following considerations.
Think About the Window's Appearance
- Choose the right size and shape
- Pick a style that matches your home's design
- Match the materials used in the frame
- Consider the color and clarity of the glass
Think of the Functions You Want this Window to Perform
In the location it will be installed, what should this window do:
- Light the room with daylight?
- Control glare?
- Reduce fading of furniture and drapes?
- Insulate and aid in thermal comfort?
- Prevent condensation?
- Improve ventilation?
- Dampen sound?
Think About the Costs of a Window in this Particular Location
Consider more than just the initial price of a window. These factors are also
important:
- What's the cost of installation?
- What's the cost of maintenance, over time?
- What sort of warranty does it have?
- How long will this window last before you need to replace it?
- Will you need to buy any extra interior and exterior window treatments, like
awnings and blinds?
- How will this window affect your heating and cooling costs over time?
- How will this window impact the resale value of your house?
Various information courtesy of the Department of Energy and ENERGY STAR www.eneravstar.gov,
and the California Energy Commission www.consumerenemvcenter.org
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