Surge protection is no longer an option reserved for those with exotic or expensive electronics. Today, we’ve all got devices that can be damaged or destroyed in a millisecond by an instantaneous voltage spike surging through household wiring. Transient voltage surges can result from several causes, such as the following. Lightning. Lightning strikes about 20 million times annually in the U.S. Any lightning strike…Understanding The Various Types Of Ducts » « Is That Thermostat Temperature Right?