No "average" temp, but avoid extremes.
icantwinn said:
i have a dell dimension 3000 and i dont know what an average temp is for pc's but its running around 33C (91F) is that good or bad?
There is no such thing as an "average" temp (it depends on your CPU speed and equipment), but avoid extremes. A case temp of 33'C is very good, though any case temp below 40'C is more than decent.
It's CPU and GPU temps that matter most. The lower the case temp, the better your CPU and GPU heatsinks will perform, but at some point, low case temps will have only minimal effect.
icantwinn said:
i have one fan blowing out with my side panel off and a little 4 inch desk fan i got from walmart blowing in on the side. my pc room stays around 72F or so no dust either i blow my pc out every couple of weeks
I had almost the exact same setup for about a year. An old case that I had to manually drill holes in to add just one 80mm fan, plus I ran with the side off with a cheap 4" desk fan blowing on the MB. This kept things reasonably cool, but not as cool as it should be.
In fact, if you have your 4" fan blowing directly/indirectly on another fan, you can actually be HURTING your cooling performance, as the first fan drags on the blades of the second, preventing them from spinning at full speed!
A good case provides a number of functions. The first of course is noise reduction. But it also keeps the cool air "contained" close to your parts and improves airflow. And can shield you from any ambient low-level radiation given off by your equipment.
I moved my PC into a new case with room for SEVEN fans. I replaced the flat ribbon cables with round ones to improve airflow. The result, my case temperature dropped by a whopping 10'C and CPU temp fell by 5'C (give or take a degree). Sealed up tight, it is much quieter now too.
Excessive heat can lower the lifespan of your equipment. Always running the CPU at 50'C can cut its life in half, and high case temps affect everything else.
33'C is good, but doesn't tell the entire story. Put "a new case" on your Xmas list.