Energy Evaluation uses the calculation units defined by you in ArchiCAD, at Options > Project Preferences > Calculation Units & Rules. Thus, Energy Evaluation uses the same units as the ArchiCAD Project to which it is applied.
Additional unit setting options:
•When defining components of Heating and Ventilation systems in the Building Systems dialog box, choose either Celsius or Fahrenheit for the water temperature.
This way, for example, you can set the temperature scale of Hot water generation independently of other units. (This can be useful if your country uses metric dimensions and Fahrenheit temperatures concurrently.)
•On the U-value (R-value) Calculator and the U-value (R-value) Override panels, click the pop-up to alternate between U-value and R-value as needed.