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On a very hot day, you decide to cool your kitchen by leaving the refrigerator door open. What is the result?

a) The room cools down, but you have a huge energy bill because refrigerators are inefficient and expensive to run.

b) The room cools down only if the refrigerator's coefficient of performance is > 50%.

c) The temperature in the room stays constant because the exhaust heat from the refrigerator exactly cancels the cooling effect of the cold air produced by the refrigerator.

d) The room heats up because the exhaust heat from the refrigerator is greater than the heat removed from the room by the refrigerator.

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