Out of all a plants requirements, humidity in a dry climate will be the least easy to satisfy. It's a rare day that we get up early and mist all or our houseplants, or own a greenhouse with humidity control. They seem to do well anyway. To counter the effects of a dry climate we don't let the soil get severely dry on moisture loving plants, we ignore those brown tips on palms, ferns, and dracaenas. Those brown tips are probably caused from lack of humidity, but they don't spoil the overall appearance of the plant. You can always trim the brown tips, whatever you think is unacceptable.