You are in a store and you overhear a couple talking about comparing window air conditioning units. The man is skeptical of the claims on the sign describing the performance of the air conditioner, but the woman seems confident that the claims are reasonable. Looking at the sign, you notice that the air conditioner is to remove heat with refrigerant at 10°C, reject heat with refrigerant at 40°C, use 1 kW of power, and remove 7 kW of heat. Is the opinion of the man or woman more likely to be correct? Why?
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