Some energy efficiency retrofits are cheaper than others. Ultimately, though, energy efficiency will save you energy rather than cost you, since you will see a decrease in the amount of money you spend on your energy bill. The American Council for an Energy Efficient Economy estimates that energy efficiency costs only 2.5 cents per kwh, which is much less than coal or natural gas, which can cost between 7 and 14 cents per kwh. Either way, energy efficiency is a great idea, both economically and environmentally.
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