On average, half of the energy used in the home goes to heating it. And an inefficient (older) furnace can <i>waste</i> up to 50% of the fuel it uses! This is sending dollar bills right up your chimney!
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Newer furnaces are far more efficient. The new top-of-the-line models get more than 95% efficiency. So if you have an old furnace, you can almost double your heating efficiency by replacing it with a new EnergyStar furnace.
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Since this is such a major factor in CO2 generation, you will save 2,400 pounds a year by taking this action!