ByMark WillardandRenee Straker•

just now

Updated: June 24, 2026, 7:09 am EDTPublished: June 24, 2026, 8:00 pm EDT

In a brutal heat wave, your first instinct may be to flip on a fan — but that might be exactly the wrong move. Here's the one thing that decides whether a fan cools you down or quietly makes the heat worse.