The amount of heat generated by your computer can only be altered by either using more efficient components (ones that generate less heat) or by removing components.
Heat is a byproduct of inefficiency, if you swap your CPU for one that consumes less power (look at wattage ratings) and remove extra items that consumer power (and in turn generate heat) then you'll find the temperature savings.
PC Cooling systems are intended to dissapate heat, not lower the total heat output. Disabling them will help keep heat in your system but could cause problems (fans are there for a reason; hot chips are unhappy chips). So unless you want to bring home a block of dry ice every day to offset the generated heat then there's not a lot you can do.
Now, with all that said, try buying a cheap infrared thermometer and use it to determine where the heat is originating. Components without fans will give you the best readings (the ones with fans will blow the heat away); take a look at your monitor, printer (laser especially), power bricks, and power-supply and find the worst culprits. You might be able to put the bad-guys on a seperate power-strip and kill power to all of them when you're not around.
19I get the impression you weren't paying attention when they were teaching thermodynamics in school – Manos Dilaverakis – 2009-08-27T09:25:48.423
1Manos: I got the impression that few people did pay attention on that class. My country just outlawed 100W light-bulbs even though people heat houses >0.5 of the year. – Tadeusz A. Kadłubowski – 2009-08-27T09:40:17.350
@Manos - what about the light bulbs that need to be >100W. There are plenty examples. – Rook – 2009-08-27T20:01:13.173
Ups, sorry. Last comment was directed to @tkadlubo. @tkadlubo - btw, what country ? – Rook – 2009-08-27T20:01:50.080
This happened in Romania, where I live :). Where are you from, tkadlubo? – alex – 2009-08-27T20:13:21.633
Poland, part of european union. Lighbtulbs are off-topic and politically sensitive in our politcorrect times.. – Tadeusz A. Kadłubowski – 2009-08-28T10:36:16.140
OT But: @ldigas - I bet the most optimum place for a heater is not on the ceiling. – Stuart Axon – 2012-06-27T08:20:20.667
@StuartAxon - :-))) – Rook – 2012-06-27T08:33:52.013