Paint your roof
More than one-sixth of all electricity consumed in the U.S. is for air conditioning, but you can reduce that percentage — and save money and help cool the planet — simply by painting your roof. Households that opt for a white roof could reduce their residential air conditioning bills by 20 percent, according to the Lawrence Berkeley National Laboratory's Heat Island Group. Plus, many states offer rebates and other financial incentives for people who install cool roof coatings. Check out this guide from the Department of Energy for available cool roof options.