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Curtains, blinds, and other internal window coverings can have a significant impact on how much heat you gain from the sun during the summer. Medium to dark-colored curtains and drapes, especially those with white backings, block sunlight and heat gain significantly and can also help to hold heat in during the cold winter months. Blinds and rolling shades also offer some protection against heat gain, though their effectiveness depends on a number of factors including color, material, and reflectiveness.
Regardless of the covering type you choose, they are typically most effective when closed on south or west-facing windows, since these are the most likely to get direct sunlight during the hottest parts of the day. Closing the curtains or blinds on any window receiving direct sunlight can have at least some beneficial effect, however.
One of the big problems with using coverings such as curtains and shades to prevent heat gain during the summer is that they block light and visibility as well as heat. If you still want to be able to see through your windows and enjoy some natural sunlight while preventing heat gain, a low-E window film might be a better option to meet your needs.
Low-E films are mildly tinted plastic films that have reflective particles of metal or metal oxide in them, reflecting UV rays while still allowing for some natural light and visibility. Because the UV rays are reflected back out into the outside, they are not able to heat up the air inside of your home. While the effectiveness of low-E films can vary depending on the manufacturer, thickness of the film, and how well they are installed, it’s estimated that some low-E films can reduce summer heat gain from sunlight by as much as 70 percent or more.
There are a variety of other upgrades you can make to your home that will also help to block UV rays and prevent unwanted heat gain during the summer. Functional shutters that can be closed during the heat of the day can make a significant difference in solar heat gain, blocking the sunlight from actually reaching your windows in the first place. Awnings installed over windows can also block some light and heat, while still allowing for some visibility. Exterior solar screens are also an option, blocking UV rays and increasing your energy efficiency while preserving some light and visibility as well.
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