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Record heat wave hits US; federal thermostat advice is 78°F

A major heat wave is pushing temperatures into the upper 90s and low 100s across the Southeast, with humidity driving heat indices as high as 115°F; the federal government has long advised setting thermostats to 78°F.

Published Aug 14, 2026, 10:46 AM EDT | LehighValleyLive

There has been a long-standing piece of advice from the federal government about setting your thermostat to 78 degrees.