- Boston College Eagles: Offense shines, defense falters in loss to Louisville
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Roller shades are usually inexpensive shades that are raised or lowered from a roller bar fitted at the top of the window. Roman shades are fabric window shades that are drawn up into a series of evenly stacked folds when raised or lowered. These shades typically fit inside of the window casing, or just outside, and they come in a variety of fabrics, colors, and weaves. Heavier fabrics will typically offer slightly better thermal performance, but roller and roman shades offer only a small amount of insulation and are most effective for privacy, room darkening, and blocking sunlight.
Window blinds—vertical or horizontal slat-type—are more effective at reducing summer heat gain than winter heat loss. Because of the numerous openings between the slats of blinds, it's difficult to control heat loss through interior window blinds, but the slats offer flexibility in the summer. Unlike shades, you can adjust the slats to control glare, light, and solar heat gain.
When completely closed and lowered on a sunny window, highly reflective blinds can reduce heat gain. Horizontal slat-type blinds can also be adjusted to block and reflect direct sunlight onto a light-colored ceiling.
A light-colored ceiling will diffuse the light without much heat or glare, while allowing you to take additional advantage of natural daylighting. Curtains are fabric interior attachments that are sized to fit the window, while drapes reach all the way to the floor. A drapery's ability to reduce heat loss and gain depends on several factors, including fabric type closed or open weave and color. With such a wide variety of draperies available, it's difficult to generalize about their energy performance.
During summer days, you should close draperies on windows receiving direct sunlight to prevent heat gain. Therefore, in winter, you should close all draperies at night, as well as draperies that don't receive sunlight during the day. To reduce heat exchange or convection, draperies should be hung as close to windows as possible and fall onto a windowsill or floor.
For maximum effectiveness, install a cornice at the top of a drapery or place the drapery against the ceiling. Then seal the drapery at both sides and overlap it in the center.
Boston College Eagles: Offense shines, defense falters in loss to Louisville
You can use Velcro or magnetic tape to attach drapes to the wall at the sides and bottom. Two draperies hung together will create a tighter air space than just one drapery. One advantage is that the room-side drapery will maintain around the same temperature as the interior space, adding to a room's comfort.
Window films help block against solar heat gain and protect against glare and ultraviolet exposure. They are best used in climates with long cooling seasons, because they also block the sun's heat in the winter. They can also be a good choice on windows that are difficult to fit with other window treatments, or in places where artwork, furniture, or carpeting could be faded by UV exposure. Low-e films are also emerging as an energy-saving option.
Window films are the first window attachment to be rated by the National Fenestration Rating Council NFRC , which also created window labeling and ratings for consumers. It includes the solar heat gain coefficient SHGC and visible transmittance VT of the window film, both numbers between 0 and 1. The lower the SHGC, the better the film is at blocking heat gain.
The higher the VT, the more potential for daylighting. Read more about energy performance ratings. Silver, mirror-like films typically are more effective than the colored, more transparent ones. East- and west-facing windows, because of their greater potential for heat gain, can benefit more from these films. North-facing windows won't benefit from them, and south-facing windows may benefit somewhat, but the benefit could be offset by the reduction of heat from the winter sun.
However, these disadvantages are dependent on the specific product you choose and its features. Read more about window films at the Efficient Window Coverings Collaborative. Exterior shutters and shades are usually made of a variety of materials, including fabric, wood, steel, aluminum, or vinyl.
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- Cooperative Extension Publications;
- Bulletin #7214, Maine Home Energy: Insulated Interior Window Treatments and Coverings?
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Facebook Twitter YouTube. If you wear contact lenses , they may not protect your eyes from UV light. There are contact lenses available with UV protection. If you do not have contact lenses that absorb UV light, you need to protect your eyes with sunglasses. Sunglasses cannot protect your eyes from certain intense light sources. Looking at any of these light sources without adequate protection can cause a painful corneal condition called photokeratitis or even damage to the retina, causing a permanent loss of central vision.
Your ophthalmologist can recommend the appropriate measures to take to protect your eyes in special situations. Find an Ophthalmologist.
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