I have a new home with five ceiling fans, they all make a humming sound. The electricion has no idea. We have taken one back to where we bought them and they don't humm in their store. Any idea's on what it could be?

See the noise section of our troubleshooting guide. You're not using them with wall dimmers are you?

General ceiling fan troubleshooting and help FAQ- Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-general-troubleshooting-and-FAQ.php)