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Maintain or replace your AC
"AC efficiency is mostly a function of the technology," Scheckel says. "Keep the filter clean to allow for good air movement and keep the unit level so the condensation drains properly."
If you swap your older air conditioner for a newer unit, you could reduce your energy costs by half, according to the Department of Energy. Look for a high-energy-efficiency ratio, or EER, or an Energy Star-qualified unit. Higher EER ratings mean a more efficient air conditioner. Energy Star refers to a system adopted by the U.S. Environmental Protection Agency and Department of Energy to identify energy-efficient products.
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