Keep your refrigerator and freezer set to the optimum temperatures. These appliances are two of the biggest energy wasters in the modern home. Be sure the temperature in your refrigerator is set between 38-42 degrees (F) and in your freezer to 0-5 degrees (F). Anything lower and you are burning energy unnecessarily.
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You will save money eventually if you buy green appliances. Green tech products are a bit more pricey than conventional products, but you will save money long term through greater energy efficiency and lower utility bills. It will also pay off in the long run for the environment.