The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house?

Heat flows naturally from a warmer object to a cooler one. So, while the coils are accepting heat from the air inside the house, the coils must be cooler than that air. They do not need to contain more total thermal energy; heat transfer depends on the temperature difference.

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