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Chapter 12, Problem 35P
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Calculate the annual electric energy consumption of the washing machine and the annual cost of consumption.

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Problem 10 A homeowner is trying to decide between a high-efficiency natural gas furnace with an efficiency of 95 percent and a ground-source heat pump with a COP of 3.3. The unit costs of electricity and natural gas are $0.112/kWh and $1.44/therm (1 therm = 105, 500 kJ). Determine which system will have a lower energy cost.
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