Heating and cooling

Taken together, heating and cooling constitute the two largest uses of energy in your home — so they're also the places you can potentially save the most. Turning up your air conditioning and lowering your heat by just 3.5 degrees Fahrenheit (2 degrees Celsius) saves more than a metric ton of carbon dioxide in one year.

Automated temperature control can make your home comfortable while reducing energy use. Programmable thermostats enable you to preset temperature levels, and getting one for your home is about the best investment you can make to help save on cooling and heating costs. You set the temperatures for various periods during the day and night, as well as for the week and weekends. Not only do you not need to remember to change the settings, the program can make sure the temperature is comfortable by the time you get up in the morning or return to the house at the end of the day.

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