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?

A: They must be warmer than the air inside the house.
B:They must be cooler than the air inside the house.
C:They must have more thermal energy than the air inside the house.
D:They must be more insulated than the air inside the house.