I never noticed my unit running extremely hot, but you can set the internal fan to continuous, just read the manual about how to enter the advanced setup mode. When I left that setting off, the fan never turned on, so I guess even though it was kinda hot, it was still well within the normal operating temps for that unit. I would just make sure it has good ventilation and leave it at that, no real need for extra fans, unless you just want more peace of mind.