Do Ceiling Fans Save Energy in the Summer?

People often misunderstand the energy saving effectiveness of ceiling fans and how to actually improve your comfort in order to avoid unnecessary costs. Don’t do that this summer. Texans are expected to reach record energy demand this year and get hit with price spikes as a result.

For starters, ceiling fans don’t cool air. Instead, they actually heat it. Ceiling fans have motors that spin the blades and like all motors they are not 100 percent efficient. Heat is emitted by the electric coils powering the motor.  To prove the idea that fans actually heat the air, Wired Magazine conducted an experiment where a fan was put in a box.  Using a 40 Watt fan, the temperature inside the box increased at a rate of .01 degrees Celsius per second.

If ceiling fans heat the air, then why do we use them to cool us off?  Ceiling fans blow air across tiny droplets of sweat on your skin, which is why you feel cooler under a fan.  When the air moves quickly over the sweat, some of the sweat evaporates, leaving cooler sweat on your skin. You feel cooler because the liquid on your skin is cooler, not the air in the room.

With this in mind, here are some tips to keep cool and costs low with a ceiling fan:

  • Don’t run your ceiling fan in an empty room
  • If your ceiling fan is already installed, position your furniture so that you can feel the air blowing down from your fan
  • If all of the people and pets in the home are within reach of the ceiling fan, then you can set the home’s thermostat to a higher temperature and everyone will still be comfortable

Bottom line: If you are able to set your air conditioner temperature on the recommended 78 degrees and run the fan to keep cool, you will lower your electricity bill. Just don’t think you are lowering the temperature more efficiently.


One Response to Do Ceiling Fans Save Energy in the Summer?

  1. Pingback: What you can do right now to slash your air conditioning costs | MeterGenius

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