There are a number of reasons to purchase a white ceiling fan. First and foremost if you are looking to purchase one of these, you want white, as it will go with anything and everything. Most ceilings are white and this would melt into the ceiling, therefore not being intrusive to any room decor.
No matter what color your room is where you decide to install it, the white will not clash with the room color scheme. If you were to decide to move, you could conceivably uninstall the fan and take it with you, knowing that the color choice you made will work in your new home.
Another reason for purchasing the item is for cooling a room down when your local weather is too warm. Fans can drop a room temperature when the weather is hot at a lower expense on your electric bill than an air conditioner can.
For that reason, it is wise to use the fan when the weather starts to warm up to keep it cool in your home. You may find that it cools the room enough that you can wait for weeks or more before an air conditioner is needed.
Fans are also used to get the room air flowing. If something gets burned on the stove a fan is a great way to circulate the air and disperse the smell. During the winter fans can be used to circulate the warm heat coming from the heater. They can also be used to circulate the air during the summer when there is no breeze and the air gets stifling. Just open a window and turn on the fan to get that air moving.
So there are a few reasons to get a white ceiling fan. Whether it is for the color scheme in your room, the weather or no circulation, this would be a wise purchase that you will be happy you decided on.