Heat

Hi All,
I have a friend who was telling me how he keeps a fan turned on, facing towards his amplifier, to keep it from getting too hot. I told him that it doesn't matter because the only heat that will affect his amplifier comes from internally. I'm now wondering if I could be wrong. So I'm wondering, if a stereo is in an attic during the summer and it's being played to the point of getting hot, will the temperature in the attic effect the amplifier?