Home heating typically accounts for more than a quarter of your energy bill. In Massachusetts heating the average home generates about 8,800 pounds of CO2 per year. 
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Just by changing your thermostat settings, you can avoid 1,400 pounds of CO2 per year!
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If you typically keep your thermostat higher than 65-68 degrees, turn it down to this temperature when people are home. You should still be quite comfortable.
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When you go to bed or leave the house, turn the heat down to 55-58 degrees.