Heating & Cooling
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Adjust your thermostat when you are out of your house or asleep
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Close shades in summer to keep warm sun out
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Use fans in the summer; they cost less than air conditioning
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Move lamps and TVs away from the air conditioning; heat makes the air conditioner work more
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Install plastic over drafty windows
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Replace furnace filter regularly; dirty filters make the furnace work harder
Lighting
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Turn off lights in unoccupied rooms
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Use daylight when possible
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Keep bulbs clean so you get the maximum light from each bulb
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Use task lighting (lamp) rather than lighting the whole room.
Refrigerator
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Keep the refrigerator coils clean
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Let food cool before putting in the refrigerator
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Keep the freezer full, even if you just fill it with containers of water
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Reduce cooking time by thawing frozen foods in the refrigerator before cooking