Energy-efficient windows provide space heating and lighting to this sunny kitchen.
- The windows in your house let in light and air if they’re operable, but they can also be weak spots in your home’s thermal envelope.
- When replacing windows, purchase the most energy-efficient windows you can afford, because they will pay for themselves over their lifetimes.
Windows provide our homes with light, warmth, and ventilation, but they can also negatively impact a home’s energy efficiency. You can reduce energy costs by installing energy-efficient windows in your home. If your budget is tight, energy efficiency improvements to existing windows can also help.
Improving the Energy Efficiency of Existing Windows
You can improve the energy efficiency of existing windows by adding storm windows, caulking and weatherstripping, and using window treatments or coverings.
Adding storm windows can reduce air leakage and improve comfort. Caulking and weatherstripping can reduce air leakage around windows. Use caulk for stationary cracks, gaps, or joints less than one-quarter-inch wide, and weatherstripping for building components that move, such as doors and operable windows. Window treatments or coverings can reduce heat loss in the winter and heat gain in the summer. Most window treatments, however, aren’t effective at reducing air leakage or infiltration.
Selecting New Energy-Efficient Windows
If your home has very old and/or inefficient windows, it might be more cost-effective to replace them than to try to improve their energy efficiency. New, energy-efficient windows eventually pay for themselves through lower heating and cooling costs, and sometimes even lighting costs.
When properly selected and installed, energy-efficient windows can help minimize your heating, cooling, and lighting costs. Improving window performance in your home involves design, selection, and installation.
Before selecting new windows for your home, determine what types of windows will work best and where to improve your home’s energy efficiency. ENERGY STAR® has established minimum energy performance rating criteria by climate. However, these criteria don’t account for a home’s design, such as window orientation.
Windows are an important element in passive solar home design, which uses solar energy at the site to provide heating, cooling, and lighting for a house. Passive solar design strategies vary by building location and regional climate, but the basic window guidelines remain the same—select, orient, and size glass to maximize solar heat gain in winter and minimize it in summer.
In heating-dominated climates, major glazing areas should generally face south to collect solar heat during the winter when the sun is low in the sky. In the summer, when the sun is high overhead, overhangs or other shading devices prevent excessive heat gain.
To be effective, south-facing windows should have a solar heat gain coefficient (SHGC) of greater than 0.6 to maximize solar heat gain during the winter, a U-factor of 0.35 or less to reduce conductive heat transfer, and a high visible transmittance (VT) for good visible light transfer.
Windows on east, west, and north-facing walls should be minimized while still allowing for adequate daylight. It is difficult to control heat and light through east and west-facing windows when the sun is low in the sky, and these windows should have a low SHGC and/or be shaded. North-facing windows collect little solar heat, so they are used only for lighting. Low-emissivity (low-e) window glazing can help control solar heat gain and loss in heating climates.
If you’re constructing a new home or doing some major remodeling, you should also take advantage of the opportunity to incorporate your window design and selection as an integral part of your whole-house design—an approach for building an energy-efficient home.
When selecting windows for energy efficiency, it’s important to first consider their energy performance ratings in relation to your climate and your home’s design. This will help narrow your selection.
A window’s energy efficiency is dependent upon all of its components. Window frames conduct heat, contributing to a window’s overall energy efficiency, particularly its U-factor. Glazing or glass technologies have become very sophisticated, and designers often specify different types of glazing or glass for different windows, based on orientation, climate, building design, etc.
Another important consideration is how the windows operate, because some operating types have lower air leakage rates than others, which will improve your home’s energy efficiency. Traditional operating types include:
- Awning. Hinged at the top and open outward. Because the sash closes by pressing against the frame, they generally have lower air leakage rates than sliding windows.
- Casement. Hinged at the sides. Like awning windows, they generally have lower air leakage rates than sliding windows because the sash closes by pressing against the frame.
- Fixed. Fixed panes that don’t open. When installed properly they’re airtight, but are not suitable in places where window ventilation is desired.
- Hopper. Hinged at the bottom and open inward. Like both awning and casement, they generally have lower air leakage rates because the sash closes by pressing against the frame.
- Single- and double-hung. Both sashes slide vertically in a double-hung window. Only the bottom sash slides upward in a single-hung window. These sliding windows generally have higher air leakage rates than projecting or hinged windows.
- Single- and double-sliding. Both sashes slide horizontally in a double-sliding window. Only one sash slides in a single-sliding window. Like single- and double-hung windows, they generally have higher air leakage rates than projecting or hinged windows.
Even the most energy-efficient window must be properly installed to ensure energy efficiency. Therefore, it’s best to have a professional install your windows.
Windows should be installed according to the manufacturer’s recommendations and be properly air sealed during installation to perform correctly. Learn more in Energy-Efficient Windows Part 2 in our April 15th Issue of Green Energy Times.