A I3 watt compact fluorescent light (CFL) produces the same light as a 60-watt incandescent bulb. An Energy Star qualified compact fluorescent light bulb (CFL) will save about $30 over its lifetime and pay for itself in about 6 months.
By installing a timed thermostat to turn down the air conditioning or heat while not at home, the average single family home will save $I80/yr on their electric bills.
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Source: business2community