Room based cooling, as an air cooling system, uses the most classical type of refrigerating technique: the basic idea is that coolers push cold air in the environment, extracting warm air to the outside. Conditioners not only refresh, but also mix the air to avoid hot spots. This idea results to be efficient if the power load used for mixing the air is a small fraction of the total load of the datacenter. Simulations show that this approach is valid for relatively low power load densities (320-750 formula_1). Sometimes, when warm and hot air are being mixed the previous distinction is not plausible and this is where issues arise.