By A Mystery Man Writer
The cost effectiveness of when to turn off lights depends on the type of lights and the price of electricity.
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Earth Hour: Saving our planet one light switch at a time •
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Keep cool while saving energy this summer > Joint Base San Antonio
Should you always turn the lights out when leaving a room?
Keep cool while saving energy this summer > Joint Base San Antonio
Do you turn off all the lights in your home before going to bed
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