Dual Head Outdoor Ceiling Fan - You know what? The title of this article is merely out and out misleading. The sole actual "con" as it pertains to a ceiling fan is what it will take to get one properly installed. Ceiling fans could be difficult to install for the inexperienced do it yourselfer. In some instances, you will need to run an electrical line to the place where the ceiling fan will be to be set up. Unless you are skillful at doing this kind of thing, hiring a licensed, bonded and competent electrician will most likely save you a lot of grief in the long run.
There's also the minor "minus" that entails the problem of periodic care. Correctly installed, a ceiling fan will provide years and years of nice cooling and cost-savings on your heat bill (assuming there is a fan which allows one to reverse the blade direction).
On occasion, ceiling fans need small adjustments and get out of balance. The most common culprits are loose screws that attach the blades to the motor casing, blades that are not at the same angle (pitch) as the remaining blades and a blade or blades that weigh somewhat more compared to the others. Without going into great detail, ensure that all of the screws are tight. When they aren't tightening the ones that run the fan and have come loose. In the event the wobbling has quit, your problem has been solved.
Otherwise, utilize a yardstick or another straight part of wood and place it (with the fan stopped) vertically in the outer edge of among the blades. Rotate the blades by hand to make sure that the stick is touched by every blade. If one or more don't, only (and gradually) bend the blade(s) so that their pitch matches the others and repeat the procedure until you are satisfied that each blade has the same pitch. Turn the fan on again and see if you've solved the problem.