Server room cooling in winter using the outside cold air

Hi all,

I was thinking if it is possible to use the outside cold air in winter to cool the server room?
The benefit would be great as it would drastically reduce the power requirements needed for the air-conditioners. A more green solution that is
I guess this would require some form of air-drying.. (dehumidification)
The system should be installed in such a way that it filters and dehumidifies the air upon entering the system hall.
An option is to have the system installed inside the room so that it filtrates the already present air, but I don't know if it can handle all the air as effectivelly.


Thanks,
Dragan