Style Secret: Solar PanelsSolar power holds a lot of promise as a clean, renewable energy source, and it's relatively easy to retrofit many homes with roof-mounted solar panels. You'll need to check building codes in your city and the bylaws of your homeowner's association (if you have one); once you've gotten the green light, you'll want to do some research to source the best panels for your house. Also, you'll need a solar power inverter to channel the sun's energy into a form that your home's appliances and other electrical devices can use. Put it into practice: Want to take energy conservation one dramatic step further? Consider a living roof. These beauties have insulation benefits that help to reduce a home's heating and cooling costs significantly — plus, they help to clean polluted air and promote water conservation. Consult a structural engineer and a landscape architect to ensure that your roof can handle the added weight and other considerations.