Rachel Skillicorn 1. A 6 -inch pan on an 8-inch burner will waste more than 40% of the stoves energy 2. Some water heater thermostats come at 140 degrees, which can cost you more money 3. About 90% of the electricity used by everyday incandescent is lost as heat 4. As much as half the energy used by heating and cooling 5. Electric devices draw in even more electricity when they are plugged in
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