3 Ways To Beat The Heat

1. Put Up Sun Blockers

Try a desert trick. When the air outside is dry and cooler than the air inside, hang a damp sheet in an open window. "That's what we do here in Death Valley," says Dale Housley, a ranger at Death Valley National Park. Incoming breezes are cooled by the evaporating water.

Block the sun. Closing curtains and blinds (ideally with sun-deflecting white on the window side) can reduce the amount of heat that passes into your home by as much as 45 percent, according to the U.S. Department of Energy.

2. Don't Blow Hot Air

Make a makeshift air conditioner. If it's hot but not humid, place a shallow bowl of ice in front of a fan and enjoy the breeze. As the ice melts, then evaporates, it will cool you off.

Give your A/C some TLC. Clean or replace the filter in room and central air conditioners about once a month during the summer. If you have central air-conditioning, have the ducts checked for leaks, which can reduce a system's efficiency by as much as 15 percent, according to the U.S. Department of Energy. Seal any cracks between a window unit and the frame with peelable caulking or a sealant strip. These steps help ensure good airflow and keep the coils cleaner, which means more efficient and more effective cooling.

3. Stay Hydrated

Swig often. To replace the moisture that you lose as you perspire, be sure to drink. As you lose water to dehydration, your body temperature rises, so replacing fluids is essential to keeping cool. Avoid beverages that contain alcohol, caffeine, or lots of sugar, which are dehydrating. "Also opt for hydrating foods," says Deena Kastor, a marathon runner and an Olympic bronze medalist. "Try a smoothie for lunch, and add more fruits and vegetables to all your meals. Watermelon has the greatest water content of any food out there."

Eat light. There's a reason we reach for salads in the summer. They're easier to digest than, say, a fatty hamburger, which leaves you feeling sluggish in the high heat. Instead, go for fruits and vegetables, which are watery and help keep you hydrated (and cooler), says Robert Kenefick, a physiologist at the U.S. Army Research Institute of Environmental Medicine, in Natick, Massachusetts, which studies the effects of extreme climates on soldiers' bodies.