I have an enclosed entertainment center and have (1) Sony Receiver and (1) HTPC in there for the past 2 months. It had (2) 2" holes in the back for cords. It got pretty warm in there. I then cut 6 holes per shelf for a total of (12) 2.5" holes. See attached pictures. It now gets about 88 -90 degrees in there when watching movies. Is that still too warm? Is there an ideal temperature or is room temperature the guide? How can I cool this down a bit? I was thinking of buying (2) PC fans and attaching them to the back to exhaust the hot air. Do I power them by USB, AC power or the PC power supply? Thanks for any help for a new guy.