Ceiling fans do not actually lower the temperature of a room. The average temperature of a room with moving air is about the same as one with still air. In fact, the temperature may rise a weensy bit due to the heat produced by the fan motor. What a fan does is cool you down via convection. As air moves around your skin, the liquid (sweat) on your skin vaporizes at a faster rate, which absorbs heat from your body. This heat transfer is what makes you feel cooler even though the temperature of the room remains the same.
If you don’t already have a fan, here are a few things to keep in mind before installing one:
It costs quite a bit to cool down an entire room. Every single degree of change in temperature is a higher cost in energy spending. Adding ceiling fans to your more heavily trafficked rooms can decrease the amount of energy you spend on cooling costs.
Using a ceiling fan in the room you’re in allows you to adjust your thermostat by roughly 2-5 degrees with no change in comfort, cutting cooling costs by up to 10%. The circulating air keeps all of the cooler air from pooling on the floor in the summer, equalizing the temperature of the room. Likewise, in the winter you can set the thermostat to a lower temperature and circulate the warm air around the room, decreasing heating costs.
Ultimately, your goal is to create indoor comfort. If that means blasting the AC and running fans at max, then do so, but you should be able to get away with a slightly warmer room so long as a fan is still running.
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