Aluminum foil-based radiant barriers have the potential to cut a homeowner's summer cooling costs by up to 17%, according to the Department of Energy. The average cost reduction is between 2% and 10%, and some homeowners say the barriers have reduced the temperature in their attics by up to 30 degrees. However, experts say installing the barrier may be expensive, and they note that doubling insulation and turning up thermostats are effective ways to reduce an energy bill.

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