You also experience evaporative cooling when you go inside after being out in the rain, and your wet clothes start to make you feel chilly. This is what causes the cold sensation you feel when you hold a wet finger in the air to test the direction of the wind. It occurs when hot, dry air comes into contact with liquid water and temporarily lowers the temperature of both the air and the water. How does evaporation work?Įvaporative cooling is the loss of heat that happens when liquids evaporate. Let’s take a close look at how fans use evaporation to keep you cool without really changing the temperature of the room, and some of the best ways to get the most out of your fan. However, despite what you may feel, fans alone do not actually make the room any colder. Fans can increase airflow in a room and help you beat the heat. When you are indoors, you have to rely on fans (or an air conditioner, which we talk about in another post) to create that breeze for you. Ceiling fans that are Energy Star certified are up to 40% more efficient, on average, than conventional models.Everyone loves the welcome relief of a cool breeze on a hot summer day. When buying ceiling fans, look for the ENERGY STAR® label. Check the noise ratings, and, if possible, listen to your fan in operation before you buy it. The fan should also be fitted to the aesthetics of the room-a large fan may appear overpowering in a small room.Ī more expensive fan that operates quietly and smoothly will probably offer more trouble-free service than cheaper units. This may be important in areas where loose papers or other objects will be disturbed by a strong breeze. Small- and medium-sized fans will provide efficient cooling in a 4- to 6-foot diameter area, while larger fans are effective up to 10 feet.Ī larger blade will also provide comparable cooling at a lower velocity than a smaller blade. Multiple fans work best in rooms longer than 18 feet. A 36- or 44-inch diameter fan will cool rooms up to 225 square feet, while fans that are 52 inches or more should be used in larger rooms. Larger ceiling fans can move more air than smaller fans. Fans should be installed so their blades are no closer than 8 inches from the ceiling and 18 inches from the walls. Fans work best when the blades are 7 to 9 feet above the floor and 10 to 12 inches below the ceiling. Install a fan in each room that needs to be cooled during hot weather.Ĭeiling fans are only appropriate in rooms with ceilings at least eight feet high. In temperate climates, or during moderately hot weather, ceiling fans may allow you to avoid using your air conditioner altogether. If you use air conditioning to cool your home, a ceiling fan will allow you to raise the thermostat setting about 4☏ with no reduction in comfort. And be certain to turn off ceiling fans when you leave a room. In the winter reverse the direction of the ceiling fan to operate clockwise and set on a low speed to move warm air from the ceiling to the living levels of the space. In the summer, operate the ceiling fan in a counterclockwise direction. Ceiling fans can help improve comfort year round. ![]() Ceiling fans are considered the most effective of these types of fans, because they effectively circulate the air in a room to create a draft throughout the room.
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