Does the pool pump need a cover?

One of the men who serviced my new pool made a comment that my pool pump would last longer if it had a cover.

So, I went to the local pool store and bought one.

However, it doesn't really fit and I fear that since it is plastic it will cause the pump to build up heat.

Your thoughts and experiences?????

Here's a link to a thread a while back.

http://www.poolforum.com/pf2/showthread.php?t=2681

Bottom line is make sure ventilation is adequate.
Al