Many power companies offer a free energy audit to subscribers. The company will send a professional to physically inspect your house and provide you with a detailed report, complete with recommendations as to how you can improve your home's energy efficiency. Implementing recommendations can result in significant savings year-round.

Mary Knox Merrill/Staff/File
Steve Burke, Residential Energy Specialist with RISE Engineering and Cape Compact Light, performs an energy audit at a home in South Orleans, Mass. in this 2009 file photo.