Real Active Radiators is primarily intended for use with Real Fuels and Realism Overhaul but otherwise behaves like the stock Active Radiators with improved behavior.  Can always cool parts regardless of ambient temperature. (unlike real radiators, stock KSP radiators will not pull heat if the ambient temperature is hotter than the radiator's temperature)  If the cooled part is colder than the radiator's skin temperature then an added heat pump cost (in ElectricCharge) will be incur