Fans use less energy to operate than any type of A/C. The simple act of blowing air across your skin can provide you with a cooling sensation without the need to reduce the temperature in the room. Of course, this won't work well if you spending your days inside an air-conditioned place or if you are consistently keeping your home at a low temperature.
There was a day not too long ago that a neighbor friend was over to visit and she had a hard time tolerating the temperature in our house with the fans blowing because she has become accustomed to much lower temperature at her work and in her home because of central air. I had to laugh, because I thought it was just fine in our home and checked the thermostat after she left and it registered 78 degrees. But I guess it just goes to show you that it takes time to adjust the temperature in your home and you need to do it gradually or you could become discouraged.