Gear is hot. Hot is bad.
As I'm sure you've noticed by now, nearly every piece of electronic equipment you own creates heat. Some, like projectors, create a lot. Others, like DVD players, don't create very much at all. Depending on how you have your gear set up, though, any heat can create a problem. What's worse, you may not even know there's a problem until it's too late. There are solutions, though, and they vary depending on how you store your gear.