|It's approx 28C (83F) in my house right now. My system is running an overclocked A64 with stock heatsink/fan & NO case fans - my CPU temp is currently 44C. My point is, case fans are not an absolute necessity. If you do have one, it should be placed in the rear of the case, blowing outward.|
You told us nothing about the fan location plus it's important to know the make/model of the CPU because some run hotter than others. The old P4 Prescott for example is a furnace & was nicknamed the "hot potato".