Extreme temperatures present a significant challenge to AC systems, which engineers and installers say are really only designed to keep indoor temperatures about 20 degrees cooler than outside.
Officials are warning residents and tourists packing Mediterranean destinations to stay indoors during the hottest hours as the second heat wave in as many weeks hits the region and Greece, Spain and Switzerland battle wildfires.
Phoenix's relentless streak of dangerously hot days is finally poised to smash a record for major U.S. cities on Tuesday, the 19th straight day the desert city is to see the temperature soar to 110 degrees Fahrenheit or more.
Tuesday will be a lovely day with seasonable temperatures and low humidity for most of Minnesota. Wildfire smoke has returned to northwestern Minnesota, where evening thunderstorms are possible as well. Scattered thunderstorms likely Wednesday.
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