def set_ac_fan_speed(self, speed):
        """
        :param speed: a float from 0.0 to 1.0 (0 - 100%)
        :return: nothing
        """
        desired_state = {"fan_speed": speed}

        response = self.api_interface.set_device_state(self, {
            "desired_state": desired_state
        })

        self._update_state_from_response(response)
:param speed: a float from 0.0 to 1.0 (0 - 100%)
        :return: nothing