'Return the lower bound temperature we try to reach.'

@property
def target_temperature_low(self):

    if ((self.is_away_mode_on or (self._mode == STATE_ECO)) and self._eco_temperature[0]):
        return self._eco_temperature[0]
    if (self._mode == STATE_HEAT_COOL):
        return self._target_temperature[0]
    return None
