How do I use Air Conditioning to lower the humidty in the room I store my gear?

I've got an accurate hyrometer in their and with all the rain that the south coast is getting the humidity is 94 percent. I've tried the humidity setting on the AC unit, but it won't do anything unless I have it set to 16 degrees. It will then lower the humidity to 65 after 2 hours.

Is this correct for an AC or am I doing something wrong?