Every year, an estimated 600 people in the U.S. die in extreme heat waves. Nearly 10,000 are hospitalized and more than 67,000 visit emergency rooms. This year, record-smashing heat waves have swept across the southwestern United States, which has sweltered under temperatures above 100 degrees for weeks. In July, excessive heat warnings were announced for many western U.S. states, Texas and some of Florida.
In the last century, temperatures have risen 1.5 degrees and modeling efforts suggest that temperatures will continue to rise 2.5 degrees in the next few decades. Extreme heat can wreak havoc on the body's ability to cool itself, which can lead to heat related illnesses and death., especially for older and medically vulnerable people. At Pacific Northwest National Laboratory , researchers study technologies and provide comprehensive guides to homeowners that can help keep buildings cool.
Exterior coverings like awnings, solar screens, roller shades and operable shutters are especially effective at keeping out the sun's heat. In one study, exterior solar screens cut AC use by more than 10% compared to interior vinyl blinds and more than 20% compared to no window coverings. If the power goes out, or if you don't have air conditioning, window coverings are the best way to keep out heat. Covering windows can be low-cost or free—even a piece of cardboard or clothes hanging in front of a
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