We have a new archival space that I am attempting to get the temperature and humidity corrected, especially in the vault. 

The vault is 25.5' X 27' X 13.5' = 9,294.75 cubic feet.

We have a liebert system that is supposed to take care of the temperature and the humidity.  Both fluctuate with the temperature getting to high and the humidity is consistently to low.

Does anyone have recommendations on equipment to take care of the humidity if our current system won't do the job?