Many fans come with timers so you can set a time limit for your fan to automatically shut off. But if your fan does not have a timer, it’s important to shut it off and even unplug it every now and then to give the motor a chance to cool down. Constantly running appliances, including fans, not only raise your electric bill but can also be a fire hazard, so make sure you give your fan an occasional break. And fans should never be left running unattended.