If you have multiple energy providers to choose from, you may be able to save money by switching. Before you sign up with a new company, however, make sure you understand how you'll be billed and exactly what you'll be billed for. For example, hidden fees and unexpected monthly charges can quickly negate potential savings.

Cleveland Museum of Natural History/PRNewsFoto/File
PNC SmartHome Cleveland being moved from The Cleveland Museum of Natural History to its permanent site in this October 2011 file photo. You may not be able to match the efficiency of the PNC SmartHome, which uses 90 percent less energy than the typical house, but you can get a good start by shopping around for energy providers in your area.