Originally Posted by Mongoose135
Well the faster the heat gets out of your case, the more the room temperature rises.
With air cooling there is more heat built up inside the case and takes longer to dissipate outside of the case (the case and internal components acting as an insulator and letting out heat more gradually), so I think there is a difference, allbeit a small one.
The less radiators/fans you have, the hotter the water temperature gets, this means that there has to be more heat inside the case than when you have more radiators and lower water temp(simple logic). Whether this is a big enough difference to have an impact on room temperature I don't know.
You are confusing temperature and heat (energy), they are two different things.
A radiator will warm a room, but you can touch it without getting burnt - high heat, low temperature.
A match won't warm a room by much, but it will burn you - low heat, high temperature.
The computer is producing the same amount of heat energy regardless of how hot it is (sort of, see caveat below). Once you hit steady state, which takes seconds to minutes depending on how much mass your cooling system has, the rate of heat transfer out of the case is the same as the rate of power consumption by the computer (otherwise temperature will increase).
If you have an inefficient cooler all you are doing is increasing the resistance
to heat transfer, which then requires a higher temperature to transfer the heat at the same rate as it is produced. If you have a more efficient cooler then you are reducing the resistance to heat transfer, meaning that you can transfer the same amount of energy per second (power) with a lower temperature difference between the heat source (CPU) and ambient. However, either way the heat transfer rate ends up the same. Power in = power out.
It is not temperature that is heating the room, it is heat energy (see the match vs. radiator example above). So because the heat energy is tied to the power usage of the computer, and not the efficiency of the cooler, it doesn't matter how you cool your computer, the same amount of heat will be dumped into your room regardless.
Having said all that, there is one caveat. The hotter an electrical component is the more resistance it will have. The higher the resistance, the more power lost to heat for a given amount of electrical current. So if your computer is warmer, it will actually use more
electrical power than if it is cooler, heating the room more. This effect is marginal within the temperature ranges we are talking about though.
Tl:dr - It really doesn't matter how good your cooler is, your room temperatures will be roughly the same.