def METHOD_NAME(self):
    """
    Retrieves the high threshold temperature of thermal
    Returns:
        A float number, the high threshold temperature of thermal in Celsius
        up to nearest thousandth of one degree Celsius, e.g. 30.125
    """
    if self.is_psu:
        return 0
    temp_file = "temp{}_max".format(self.ss_index)
    return self.__get_temp(temp_file)