My computer raises the ambient room temperature by about 4°F. I don't like it (in the summer)

"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."

"I think a good approach is to power down components not in use. Everything that uses power, produces heat.

Do you have multiple hard disks running? Do they spin down when idle?
Do you have multiple monitors? Might help if you switch one or more off, if not needed.
Is your computer the only thin producing heat? What about light bulbs? I'm not saying you should sit in the dark, which is bad for the eyes, but you probably don't need artificial daylight either.

This may not have a huge effect but still, you can try."

As the other posters said, you have to remove the heat from the entire room. Here's a guy who built a water-cooled concrete slab heat pump to cool his PC.

Don't alter your system's cooling unless it's to increase it. Computers are designed with certain cooling requirements and expected airflow patterns. Reduce that cooling, and you could end up with fried computer.

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