Why do you want to make a room filled with electronic equipment more humid?
I think that's the dumbest thing I've ever read...
No it's NOT stupid.
Humidity levels that are too low (and 12% is DEFINITELY too low) allow static electricity buildup - which KILLS electronics.
The data centers I have worked in generally aimed for ballpark 40% RH - and at LEAST 30% - for that reason.
An evap cooler would probably be the best option.