If we're talking about extreme heat...sure. But that's not the case here, and the foam is not really any kind of issue. The drives in the HR24 series are "green" and give off less heat than most previous HD DVR models they've released. The HD DVR (side to side) ventilation is very good in at least 2 of the 3 HR24 models (HR24-100 and HR24-200). I've seen the foam mounting done in some desktop PC's as well - no problem. The -500 model has back-exit cooling, which seems to have slightly less outward air flow than the other two.