Want to know if your home is using too much energy compared to homes that are similar in size in your part of the country? You can hire an auditor to come and analyze it for a fee, or you can do it yourself for free with help from the Environmental Protection Agency's Home Energy Yardstick. All you need to know is your ZIP code, square footage of your house, number of occupants, types of energy sources (electricity, gas, etc.) and have the last 12 months of utility bills for the house (which you can also get from your utility companies). The online tutorial will take you through the process, and it'll give you an audit score. It will also give you information on how much energy you use for heating and cooling, cooking, lighting and hot water. Plus, it provides tips to lower your bills, improve comfort and increase your home's score. Do it at energystar.gov.