Elections increase the democratic mandate of a House. However, they do not necessarily improve the deliberative quality of democracy. John Parkinson writes:
Appointees are not dependent on parties for their future career. This is why governments often find that even their political appointees become so independently minded once in the job. Life tenure can have a wonderfully liberating effect on the mind. From a deliberative point of view, the problem is not that the Lords are unelected, but that they have relatively little power to force the government to stop and think again.
The Power Inquiry has suggested that elected peers should be over the age of 40 to ensure they have a reasonable amount of life experience and that peers should be elected for one term of around a decade. I would add that they should not have been an MP for at least 10 years. These restrictions would all minimise the influence that political parties could have on peers, and prevent the Lords becoming a rest home for career politicians at the end of their long and meaningless political lives.