The best way to make Helium is by combining two Hydrogen atoms (H+H).
It is called Fusion and also release lots of energy. Maybe the excess energy from the Helium factory can be used to power the world.
Also, He is very small, it will "leak" out no matter how secure and tight the harddrive is. The good news is nothing will replace the He since nothing can leak IN.
As for temperature, He will not help, it is surface area and the speed at which you can radiate heat off that will determine the inside temperature. "Simple" but hard to solve mechanical problem.
Keep Up with TechRepublic