A big fan
A ceiling fan can make an air-conditioned room feel 4 degrees cooler, according to an article in Mother Earth News. On cooler days, the fan could eliminate the need for air conditioning. Even if you must use air conditioning, the fan will let you lower your thermostat. MEN reports, “By raising it just 2 degrees, you can save up to 14 percent on your energy bill throughout the year.” Just remember to turn off the fan when no one is in the room because, while fan make people feel cooler, they don’t actually change the room’s temperature, like air conditioning does.