Depends on your calculation. If you are calculating the energy input to the system vs. heating output of the system, then yes, it will be more than 100% efficie

Depends on your calculation. If you are calculating the energy input to the system vs. heating output of the system, then yes, it will be more than 100% efficient. However, if you are calculating total energy input to the system vs. heating output of the system, then you are at less than 100% efficiency. The heat in the atmosphere, is also due to some energy consumed somewhere, whether man made or not.