Join Date: Aug 2010
Location: Shaw Direct Employee
From someone with piles of 630's on his desk all the time, the best advice I can give is to just ensure the 630 has adequate ventilation on all sides. The fan will kick in when required to cool it down. As long as you're not stacking components on top of each other (or not placing the 630 on something else that generates a lot of heat, like a home theatre amp) you should be totally fine.
Oh, and avoid placing it (or any home theatre components for that matter) on a soft surface like carpet - this effectively blocks the bottom vents.
Finally, as others have said, we don't recommend unplugging it every night. You're just inviting problems and extra wear, plus all the potentially missed recordings, Guide updates, etc.