Save energy and reduce heating costs (while staying cozy!) with these expert tips.

By 2050, over 5 billion people could face at least a month of extreme heat each year. See the risk level in your city.

A fan might feel like a lifeline in a heatwave, and for older adults it may be of some help – but not as much as it might seem. A new study has found that while high-speed fan use slightly reduced ...

That triple-digit forecast prompting our First Alert? Here’s an overlooked factor that makes it even more brutal than you may think. Our weather app shows a forecast high of 100° with a heat index of ...

Add Yahoo as a preferred source to see more of our stories on Google. The lower half of the United States is sweltering under a heat dome, with nearly 85 million Americans from South Dakota to Texas ...

The heat index, or apparent temperature, combines air temperature and relative humidity to indicate how hot it feels. High humidity slows sweating, the body's natural cooling system, making ...

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air temperature. Since heat index values were devised for shady, light wind ...