If the air in your house is hotter and more humid than it is outside, you don’t have to crank up the air conditioning . A damp towel, as suggested by a Death Valley park ranger, can even things out. Photo by tsmall . The damp towel, preferably light-colored, should hang in a window, where its trapped water evaporates and cools the air flowing through it into your house. It’s the kind of temperature hack you should only have to tend to once or twice a day, and might be easily pulled off by just wetting your towel a bit more after a shower.

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