A fan can help you feel cooler, but won't lower the temperature of a room. Image: Shutterstock Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. By signing up, you confirm you are 16+, will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy . You may unsubscribe at any time. Want to spend less on energy? You’re not alone. Summer’s approach means air conditioning season is almost here, just in time for a global energy crisis. Naturally, we’re all looking for ways to lower our energy bills . There’s a lot of great advice out there, from ditching incandescent lights to getting a heat pump . But there’s also some energy-saving advice that is useless—and a few tips that actually waste energy. Here are a few common myths about energy conservation, debunked with actual science.  Closing vents in empty rooms doesn’t save energy.…